The physical boundaries of Zone 3 and transmission facilities located in Zone 3 are shown in Figure ZS 24.

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1 September 00 0 Year Assessment overview includes the Wisconsin counties of: Columbia Crawford (southern portion) Dane Dodge Grant Green Iowa Lafayette Jefferson Richland Rock Sauk Walworth and Winnebago, Ill. (northern portion) The physical boundaries of and transmission facilities located in are shown in Figure ZS 4. Land use in is a mix of rural, urban and agricultural. The major population centers are the Madison metropolitan area and the Janesville/Beloit area. typically experiences peak demands during the summer months. Manufacturing, food processing, state government and institutional loads are among the largest electricity users in the zone. Demographics The population of the counties in grew at an annual rate of.0 percent from 000 to 00. The highest growth rate of.5 percent per year and the largest increase in population of 70,00 occurred in Dane County. Population in is projected to grow at. percent annually for the 00 to 00 period. From 00 to 00, Dane County is projected to realize the largest increase in population (8,00) and is projected to have the highest growth rate of.5 percent. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

2 September 00 0 Year Assessment During the same period, the annual employment growth rate was 0.9 percent. The highest growth rate (.4 percent) and the largest increase in employment (5,000) occurred in Dane County. Employment in is projected to grow at. percent annually between 00 and 00. Dane County is projected to realize the largest increase in employment of over 6,000 and Sauk County the highest growth rate of.6 percent. Employment Population Annual Growth Rate Annual Growth Rate Dane, WI.4 Sauk, WI.6 Dane, WI.5 Dane, WI.5 Total Increase Total Increase ,09,444,076 8,57 Dane, WI 5,05 Dane, WI 6,9 Dane, WI 70,87 Dane, WI 8,6 environmental considerations covers the south central and southwestern portions of Wisconsin and the Illinois county of Winnebago. The ecological landscapes in this zone vary from Southeast Glacial Plains in the east through the Central Sand Hills area to areas that are part of the Southwest Savanna and Western Coulee and Ridges landscapes in the west. The eastern portions of the zone generally are level to gently rolling terrain, while the western areas are characterized by the ridges and valleys of the driftless area. The northern and western portions of this zone are located in the Lower Wisconsin River Drainage Basin, and the Mississippi River forms the zone s western boundary. Other portions of this zone are located in the Grant Platte, Sugar River Pecatonica, Upper and Lower Rock and Fox Illinois drainage basins. Horicon Marsh National Wildlife Refuge is located in the northeast part of the zone, and the Upper Mississippi River Wildlife and Fish Refuge is located along the zone s western edge. The Baraboo Hills are located in the north central portion of the zone. The Lower Wisconsin River State Riverway also is found in this zone. electricity demand and generation The coincident peak load forecasts for for 0, 05, 00 and 05 are shown in Table ZS 0. Existing generation, along with proposed generation based on projected inservice year, also are shown. The resultant capacity margins, with or without the proposed generation, are shown as well. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

3 September 00 0 Year Assessment The table shows that load is projected to grow at roughly. percent annually from 0 through 00. Comparing load with generation (at maximum output) within the zone indicates that has more generation than peak load during peak load periods. However, actual operating experience indicates that during most load periods, is a net importer of power. transmission system issues Key transmission facilities in include: Columbia North Madison 45 kv lines, Columbia Rockdale 45 kv line, Paddock Rockdale 45 kv line (in service spring 00), Paddock Wempletown 45 kv line, Rockdale Wempletown 45 kv line, and 8 kv facilities from the Nelson Dewey Power Plant, around the Madison area, and in the northwest and southeast portions of. Key system performance issues in include: Existing contingency thermal overloads on the Fitchburg Royster 69 kv line, Low voltages and line overloads on the 69 kv system in Monroe area in 0, Contingency low voltage issues on the Sheepskin Bass Creek Brodhead 69 kv line in the 0 timeframe, The 0 Rockdale Cardinal 45 kv line project is planned to address thermal constraints and low voltage issues in Madison area, The West Middleton Stage Coach 69 kv line requires higher capacity under contingency conditions in 05, Intact system 8 and 69 kv low voltages in Jefferson and Dane Counties are an emerging issue in 05 and beyond, Insufficient 69 kv line capacity in Walworth County in 06, Low voltages and line overloads on the 69 kv system in the Dam Heights area, The existing Hillman 8/69 kv transformer potentially overloads in 08 under single contingency in the Dairyland Power system, and Even with some new 8 kv capacitor bank installation in 0, the North Madison Columbia 45 kv double circuit line outage could cause severe low voltage limitations in 00 timeframe. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

4 September 00 0 Year Assessment 0 study results Refer to Table ZS and Figure ZS 9 Summary of key findings Short term operation procedures are required to address the Fitchburg Royster 69 kv line overload problems before a permanent transmission project can be implemented, Maintaining reliability of service to load in and around the Madison area requires that system reinforcements be implemented in the near term. Longer term, a 45 kv source on the west side of Madison will be required, With little or no generation running at Concord Substation, low voltages are observed under both system intact and single contingency conditions. Economic benefit analysis may be performed to evaluate whether new transmission projects can be justified, and Significant load growth in the Rock and Green Counties, along with the mismatch of load to generation in the area, could result in the Monroe area 69 kv network being subjected to unacceptably low voltages and thermal overloads under both normal and contingency conditions in the summer of 0. Rebuilding the 69 kv line Y from Brodhead to South Monroe will address these issues. In response to some single contingency low voltage problems in, a total of 6 MVAR of capacitor banks distributed among the Sheepskin, Lamar, and Spring Green substations was deemed to be the most feasible solutions in the 00 0 timeframe. There were a number of facility overloads and several facilities near their emergency ratings in in 00 0 timeframe. Many projects are either planned or proposed to address these near term thermal problems by As a result, ATC proposes to uprate four 69 kv lines and two 69 kv substation terminals. Historically, import capability from Illinois has been severely limited for loss of the Wempletown Paddock 45 kv line (ATC/Commonwealth Edison facility). This limitation has been addressed to some degree by installing a second 45 kv line between Illinois (Wempletown Substation) and south central Wisconsin (Paddock Substation). However, the underlying 8 kv transmission system in the Janesville area and to the north still poses limitations for transfers into the Madison area. To help address this, ATC proposed the first transmission project within the Midwest Independent System Operator (MISO) footprint driven by economics. This project, the Paddock Rockdale 45 kv transmission line, significantly reduces congestion and enhances import capability into and ATC as a whole. In spring 00, this project was successfully implemented. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 4

5 September 00 0 Year Assessment Two other major 8 kv line projects in are in service. One is the North Madison Huiskamp 8 kv line project; the other is the Oak Ridge Verona 8 kv line project. The North Madison Huiskamp 8 kv line project addresses thermal overloads for outages of the Dane Waunakee, Blount Ruskin or West Middleton Pheasant Branch 69 kv lines or the North Madison 8/69 kv transformer. The Oak Ridge Verona project also addresses several line overloads and low voltages in southern Dane and Green counties. Along with the Oak Ridge Verona 8 kv line project, the Verona Sun Valley tap portion of the Y 9 69 kv line will be rebuilt due to existing condition issues and the potential of thermal overload. The Concord 8 kv bus voltage is approaching the voltage limit under intact system conditions. Additionally, an outage of the Hartford St. Lawrence 8 kv line causes marginal bus voltages at Rubicon and Butler Ridge. An outage of the Jefferson Crawfish River 8 kv line causes marginal bus voltages at Crawfish River and Concord. Redispatching generation at Concord does improve the area voltage. An economic benefits analysis found it was more economical to run Concord generation than to install capacitors for voltage support. This was true until 06 when capacitor banks and/or generation would be necessary to provide voltage support. Studies have indicated the potential for severe low voltage limitations in Dane County area for the loss of North Madison Columbia double circuit tower. To address these issues in the near term, one.66 MVAR 8 kv Femrite capacitor bank and one.66 MVAR 8 kv Kegonsa capacitor bank have been proposed. Also in Dane County, the Fitchburg, Cross County, Oak Ridge and Pleasant View 8 kv buses have marginal system intact voltages. The Femrite and Kegonsa capacitor bank projects will also improve these system intact low voltage limitations. The Fitchburg to Royster 69 kv line is susceptible to thermal overloads and the area experiences low voltages at Syene, Nine Springs, and Pflaum for loss of either end of the line. A package of projects was proposed to address these issues. It includes uprating the Fitchburg Nine Springs 69 kv and Royster Pflaum 69 kv lines, moving the AGA load to the Royster Femrite 69 kv line and installing two 6. MVAR, 69 kv capacitor banks at the Nine Springs Substation. Prior to the implementation of these projects, a short term operation procedure including potential load bridging is available. The short term operation procedure will be evaluated each year until the transmission projects are implemented. ATC and the city of Madison have proposed to bury part of the two Blount Ruskin 69 kv overhead lines underground. This project will be completed by 0. Significant load growth in the Rock and Green Counties, along with the mismatch of load to generation in the area, will result in unacceptably low voltages in the Monroe area. Under several single contingency conditions, thermal overloads also arise on the Y 69 kv line SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 5

6 September 00 0 Year Assessment sections Brodhead Spring Grove Blacksmith South Monroe. The planned solution to address these issues is to rebuild the Brodhead South Monroe 69 kv line (Y ) using 8 kv construction standards and initially operate the line at 69 kv. The western portion of Jefferson County and the eastern portion of Dane County have also experienced high residential, commercial, and industrial load growth. Much of the area is served by the Rockdale Substation. Studies conducted by indicate that unacceptable voltages could be experienced in the Academy, Boxelder, London, Cambridge, Lakehead, and Jefferson Substation areas with the outage of any segment of the Rockdale Boxelder or Rockdale Jefferson 8 kv lines. In order to provide reliable service to the area, a new Jefferson Tyranena (Lake Mills) Stony Brook 8 kv line was recently placed in service. We currently mitigate several of the identified 8 kv low voltages through remote control of the 8/69 kv transformers in the affected areas. In certain instances, transformer load tap changers are adjusted to bring the 8 kv contingency voltages above the planning criteria limits while maintaining the 69 kv bus voltages above criteria limits. This is a balancing act, and as loads continue to grow the process will no longer be effective. Projects whose Need date precedes the In service date Uprate McCue Lamar 69 kv line The potential for single contingency low voltage problems in the Lamar area and an overload of the McCue Lamar 69 kv line were observed in the 009 summer peak model. Considering reasonable project lead times, the 00 in service date was chosen for this provisional project of uprating the McCue Lamar line and installing capacitor banks at Lamar. In the interim, dispatching Sheepskin generation could be one possible mitigation to address these constraints. Projects whose In service date precedes the Need date As a result of in service date flexibility and corresponding alignment/synergies with other ATC non planning project needs, the following projects will be in service prior to the need date. Additionally, the projects listed below are asterisked in the Annual Project Tables. Uprate X Colley Road Marine 8 kv terminals o This project only requires terminal upgrades at Colley Road substation. It has been included in the 00 ATC System Protection and Maintenance upgrade project at Colley Road. Uprate Y 6 Sheepskin Dana 69 kv line to 95 MVA o This project only requires terminal upgrades at Sheepskin substation. It has been included in the 00 ATC System Protection and Maintenance upgrade project at Sheepskin. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 6

7 September 00 0 Year Assessment Uprate Y 40 Gran Grae Boscobel 69 kv line to achieve a 99 MVA summer emergency rating o Asset Renewal initially identified 6 structures on the Gran Grae Boscobel line to be replaced due to various maintenance issues. Based on the Y 40 thermal rating analysis, it was determined that the additional scope for uprating the line from 00 degrees F to 00 degrees F would be to replace an additional 9 structures. It makes sense to combine this uprate with the previously identified maintenance project because these structures are very close to the previously identified poles. There are significant cost savings that can be obtained from performing the additional work as part of the maintenance project rather than completing the work as a separate future project. Y 8 Dane Lodi 69 kv line rebuild o A portion of the 69 kv Dane Dam Heights line will be rebuilt in the year 0 as a part of an asset renewal project that addresses first contingency overloads in the year 05. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 7

8 September 00 0 Year Assessment 05 study results Refer to Table ZS and Figure ZS 0 Summary of key findings Numerous low voltages and line overloads along with the potential for voltage collapse in the Madison area signal the need for another new 45 kv source on the west side of Madison, The Brick Church North Lake Geneva 69 kv line faces both thermal and low voltage issues, Load growth in Green County, west of Rock County and south of Dane County requires one additional 69 kv source into the area. Adding the Bass Creek 8/69 kv transformation will address a number of potential low voltage issues and transformer overloads. Due to 69 kv system load growth in Verona and Spring Green areas, the West Middleton Stage Coach 69 kv line requires higher capacity, and As load grows there is a potential for single contingency thermal overloads on the Dane Lodi 69 kv line. There were a number of facility overloads and several facilities near their emergency ratings in based on the 05 analysis. Several projects are either planned or proposed to address these near term thermal problems. As a result, ATC proposes to uprate three 69 kv lines and one 8 kv line. In addition, the remainder of Y 9 69 kv line from Sun Valley Tap to Oregon should be rebuilt due to pending condition concerns and future loading concerns dependent on clearances and load growth. In 009, ATC received the regulatory CPCN approval for the Rockdale West Middleton (Cardinal) 45 kv line project. This project will address line overloads and low voltage issues in Dane County and is planned to be in service in 0. Certain issues in southeastern are related to the 69 kv loop between North Lake Geneva and Brick Church. If one of the sources is out of service, low voltage will exist on that end of the line and thermal issues will exist on the other end. The 05 analysis found the Lake Geneva, South Lake Geneva, Katzenberg, and Twin Lakes 69 kv buses experienced unacceptable bus voltages with the North Lake Geneva Lake Geneva 69 kv line out of service. Likewise, an outage of the Brick Church Cobblestone 69 kv line will result in the Cobblestone 69 kv bus voltage dropping to near unacceptable levels. Thermal issues will occur on the same loop. The Cobblestone Zenda tap will exceed its summer emergency rating for an outage of North Lake Geneva Lake Geneva 69 kv line. The Katzenberg Zenda tap will approach its summer emergency rating for the same outage. The project to construct a 8 kv line between North Lake Geneva and South Lake Geneva and install a 8/69 kv transformer at South Lake Geneva can provide thermal SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 8

9 September 00 0 Year Assessment and voltage relief in the Lake Geneva area. The preliminary in service date is 06; however, it could be delayed if the study area load forecast change justifies such action. The Colley Road 8/69 kv transformer will approach its summer emergency rating for an outage of the Paddock 8/69 kv transformer by 05. The proposed project to install a 8/69 kv transformer at Bass Creek will resolve the thermal issues in the area for the foreseeable future. The Evansville and Brodhead areas are facing unacceptably low voltages under single contingency conditions. In addition, the North Monroe 8/69 kv transformer loading is approaching its summer normal rating under system intact conditions. In conjunction with the rebuild of line Y from Brodhead to South Monroe (0), a new Bass Creek 8/69 kv transformer and the Townline Road Bass Creek 8 kv line uprate in 0 will address these problems and provide an additional 69 kv source into Green and Rock Counties. These projects will also allow the delay of a new Brooklyn to Evansville 69 kv line project outside of ATC s 0 year planning horizon. A new project is created to uprate the West Middleton Stage Coach 69 kv line by 05. It will address potential line overload problems under several single contingency conditions. A LiDar survey and a thermal rating analysis will be conducted to determine the final scope of the project. Projects whose Need date precedes the In service date Rebuild the Y 9 Verona Oregon 69 kv line The need year is listed as 008. The in service year is 04. Distribution load shifting at Stoughton will eliminate potential system limitations in the timeframe. Bass Creek transformer and uprate Town Line Road Bass Creek 8 kv line X The need year is listed as 00. The in service year is 0. Mitigation measures for the potential 00 0 system limitations include installing a 5.7 MVAR distribution capacitor bank at the Union Townline 69 kv Substation (009) and upgrading the existing Sheepskin capacitor bank from 0.8 MVAR to 6. MVAR (00). Uprate Fitchburg Nine Springs and Royster Pflaum 69 kv lines, move AGA to the Femrite Royster 69 kv line and install Nine Springs capacitor bank The need year is listed as 006. The in service year is 0. Post contingency distribution load bridging will be utilized as an interim mitigation measure to alleviate potential singlecontingency thermal and voltage issues. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 9

10 September 00 0 Year Assessment 00 study results Refer to Table ZS and Figure ZS Summary of key findings Additional reactive power is needed throughout the, Load growth in the Lake Geneva area continues to cause severe single contingency thermal overloads and low voltages, Potential single contingency thermal overloads on the Kirkwood Artesian 8 kv line, The existing Hillman 8/69 kv transformer overloads under single contingency in the Dairyland Power system, The West Middleton (Cardinal) Blount 8 kv project is delayed from 07 to 00; the primary need driver is the outage of North Madison Columbia 45 kv double circuit line, Potential single contingency thermal overloads on the Gran Grae Boscobel 69 kv line will require system reinforcements, Thermal overloads call for reinforcement on the Y Colley Road Brick Church 69 kv line, Due to 69 kv system load growth in Green County, the North Monroe South Monroe 69 kv line requires higher capacity, Several projects were delayed due to lower load forecast in certain local area, and The new in service dates were determined considering not only the need dates identified in the 00 0 Year Assessment, but also the need dates identified in both the 008 and the 009 Assessments. In response to low voltages throughout, a significant amount of capacitor banks distributed at the Eden, Mazomanie, Concord, Brick Church, Sun Prairie, Dam Heights, North Monroe and Boscobel substations in the timeframe were deemed to be the preliminary solutions. There were a number of facility overloads and several facilities near their emergency ratings in based on the 00 analysis. Two 69 kv line uprate projects and two new 8/69 kv transformer projects (Hillman and Spring Green Substations) have been proposed to address these thermal problems. A new project was created to uprate the North Monroe South Monroe 69 kv line by 08. It will address potential line overload problems under several single contingency conditions. A LiDar survey and a thermal rating analysis will be conducted to determine the final scope of the project. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 0

11 September 00 0 Year Assessment Potential Kirkwood to Artesian line overloads and serious post contingency low voltages around the Reedsburg loop call for additional transmission reinforcements. The Lake Delton Birchwood 8 kv project in 00 will not only interconnect a new T D substation, but also address impending low voltages and overloads identified on the transmission system. In the 008 Assessment, the West Middleton 8/69 kv transformers and West Middleton Blackhawk 69 kv line were observed to be overloaded under single contingency conditions in the 07 timeframe. To address these thermal overloads, a Cardinal to Blount 8 kv line project was being considered. In conjunction with the Rockdale West Middleton (Cardinal) 45 kv line project (0), the Cardinal Blount 8 kv line could eliminate the thermal overload issues in the long term and provide additional transfer capability into downtown Madison. The status of this project was provisional for several reasons. o The West Middleton 8/69 kv transformer ratings need to be validated. o The in service date driver needs to be confirmed to determine whether the summer normal overloads can be mitigated by other means. o Project alternatives have not been thoroughly developed and evaluated. In 0, the existing West Middleton Substation will be divided into two separate adjacent substations behind the same fence as follows: West Middleton will remain as 69 kv, and Cardinal Substation will encompass 8 and 45 kv portions of the substation. Since the 008 Assessment, the West Middleton (Cardinal) 8/69 kv transformer ratings have been validated with higher ratings. In addition, with the new load forecasts utilized in the 009 and 00 Assessments, the original needs for the Cardinal Blount 8 kv project are sliding out of 0 year planning horizon. However, considering the potential severe low voltage problem under the Columbia North Madison 45 kv double circuit tower outage condition, as a potential long term solution, it was decided to keep the project in the project table as a provisional 00 project. It is provisional because the justification of the project needs to be confirmed and a project scope needs to be developed. Please note, due to a potential large T D project development in Madison area, the in service date for this project could be advanced. Significant load growth near the Lamar area causes numerous system constraints. Near term solutions have been developed:. Uprating Stoughton Substation terminal equipment to achieve a 69 MVA summer emergency rating on Y 46 in Uprating the McCue Lamar section of the Y 6 to a minimum summer emergency rating of 5 MVA in 00.. Installing.45 MVAR 69 kv capacitor banks at Lamar Substation in 00. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

12 September 00 0 Year Assessment However, these near term solutions will not be sufficient after approximately six years. Subsequently, a longer term plan will be developed and implemented before 07 to address the emerging McCue Lamar and Bass Creek Footville thermal overloads and voltage limitations at the Lamar Substation under single contingency conditions. A second 69 kv line from McCue to Lamar is currently being considered as a placeholder to resolve the issues in this area. The Y, Colley Road Brick Church 69 kv line faces both contingency thermal overloads and age and condition issues. With the proposed 06 North Lake Geneva South Lake Geneva 8 kv line project, the need for rebuilding Y can be delayed to the 08 timeframe. The delay provides planners additional time to develop the provisional Spring Valley Lake Geneva 8 kv project which may delay the Y project even further in time. Depending on the final scope of the Spring Valley Lake Geneva 8 kv project, ATC will revisit the in service date for the Y line rebuild project. Many of the issues in southeastern continue to be related to the 69 kv loop between North Lake Geneva and Brick Church. With one of the sources out of service, low voltage will exist on one end of the line and thermal issues on the other end. The 00 analysis found the Lake Geneva, South Lake Geneva, Katzenberg, and Twin Lakes 69 kv buses experienced low voltages under different contingency conditions. Likewise, an outage of the Brick Church Cobblestone 69 kv line will result in the Cobblestone, Zenda, Twin Lakes, and Katzenberg 69 kv buses to experience low voltages. The Brick Church transformer can expect to be heavily loaded for two contingencies. An outage of the North Lake Geneva 8/69 kv transformer or the North Lake Geneva Lake Geneva 69 kv line will cause the Brick Church transformer to load to exceed or approach its summer emergency rating. The proposed Lake Geneva project will resolve most of the voltage and thermal issues. As suggested above, a provisional project to construct a Spring Valley Lake Geneva 8 kv line is being considered to further strengthen this area in addition to providing network service to We Energies Spring Valley Substation. The Brick Church 8 kv bus can experience low voltages under various contingencies. The provisional project of 4.5 MVAR 8 kv capacitor banks and 8 MVAR 69 kv capacitor bank at Brick Church will address these issues. The Brick Church capacitors will be placed in service in 07. The Colley Road 8/69 kv transformer will exceed its summer emergency rating for an outage of the Paddock 8/69 kv transformer. The installation of a 8/69 kv transformer at Bass Creek should provide relief. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

13 September 00 0 Year Assessment 05 study results Refer to Table ZS 4 and Figure ZS Summary of key findings Load growth in the Green, Grant, Dane and Rock County areas will drive the need for additional 8/69 kv transformer capacity and 69 kv line uprate, Several 69 kv lines in the West Middleton, Waunakee, East Towne and Sycamore area are approaching their summer emergency ratings under single contingency conditions, Many potential terminal, line uprates or line rebuild projects will be needed in the timeframe, System intact low voltages exist on the 8 kv system in Dane County and on the 8 kv system from Nelson Dewey to Kilbourn, Numerous low voltage limitations exist under single contingency conditions throughout, and Potential single contingency thermal overloads on the Columbia Portage 8 kv lines. The 05 results suggest that further study of, particularly around Dane, Green and Grant Counties, is needed to identify an appropriate long term solution for this area that may be required beyond the year 00. The West Middleton Timberlane 69 kv line will exceed its summer normal rating under system intact conditions. This issue may call for additional 8 kv outlet from West Middleton to its west. Jennings Switching Station DPC Gratiot Tap 69 kv line will exceed or approach its summer emergency rating for the loss of either North Monroe Idle Hour 69 kv line or North Monroe 8/69 kv transformer. The Boscobel Blue River Tap 69 kv line is also overloaded for a number of outages. A potential line uprate project will address the problem. To address thermal overloads, the rating of the Portage Trienda 8 kv line will need to be increased in 0. The Paddock 8/69 kv transformer will exceed its summer normal rating of 9MVA with the transmission system intact. An outage of the Colley Road transformer or the Colley Road Park Street / East Rockton 69 kv line causes the Paddock transformer to exceed or approach its summer emergency rating of 4 MVA. Similarly, an outage of the Paddock SEPTEMBER 00 REPORT ZONES & STUDY RESULTS

14 September 00 0 Year Assessment 8/69 kv transformer causes the Shaw East Rockton 69 kv line and Park Street Colley Road 69 kv line to exceed their summer emergency ratings. The Columbia Portage 8 kv line is overloaded for the loss of the other Columbia to Portage 8 kv line by 05. Adding a North Randolph 45/8 kv transformer is proposed to relieve these overloads. This project is also expected to provide needed voltage support for Dodge and Jefferson Counties. The provisional project of constructing a Hubbard East Beaver Dam 8 kv line will address not only several 69 kv thermal overloads, but also the low voltages in the Beaver Dam area for an outage of the North Randolph North Beaver Dam 8 kv line. This project was delayed from 06 to 00 as a result of reduced load growth in the area. Assessment of Steady State Compliance with NERC Standards The mitigation plans comprised of planned, proposed and provisional projects identified for in this Assessment will allow the ATC system in to meet the steady state portions of NERC standards TPL 00 and TPL 00 in each of the five years 0 05, and for the planning horizon. SEPTEMBER 00 REPORT ZONES & STUDY RESULTS 4

15 Figure ZS-9 Ontario Coon Valley Stoddard DPC Elroy Lyndon Station Lyndon Station Union CenterUnion Center Chaseburg Hillsboro Westby Wonewoc Hillsboro Wisconsin Dells Muni Finnegan Genoa La Farge Yuba Viola Lime Ridge Readstown De Soto Sauk Soldiers Grove DPC Bell Center Plain Steuben Blue River Avoca Boscobel Brisbois La Pointe Prairie du Chien Wauzeka Boscobel Muni Eastside King (king) Woodman Gran Grae Hillside Highland Fennimore Mount Hope Iowa Eden Montfort Cobb Patch Grove Bagley BloomingtonBloomington Grant Linden Livingston Lancaster Distribution Lancaster Lancaster Troy Mineral Point Rock Branch Rewey Mineral Point New Hollandale Potosi Cassville Pioneer(ALTE) Mcgregor (ALTE) Hillman Blanchardville Elmo Dickeyville Summit Lake (ALTW) Kieler Lafayette Benton Benton M I C H I G A N New London (ALTW) Argyle ZONE Modified: April 8, 00 Sheepskin Dana Corp Saunders Creek Evansville Muni DPC Shullsburg Shullsburg Shullsburg Gratiot Green Idle Hour Jennings Rd SW STA Browntown South Wayne REC Center Browntown Albany (ALTE) Monroe Monroe Central Rock Brodhead Footville Footville Brodhead Central Brodhead South South Monroe Blacksmith Spring Grove Brodhead SW STA Viking Janesville Traxler ZONE 5 Currently, ATC owns or operates transmission facilities in 50 Wisconsin counties and in 5 Michigan counties. Facilities include: * Approximately 945 miles of transmission lines * 96 wholly owned substations * 40 jointly owned substations * ATC offices in Madison, Cottage Grove, Pewaukee, De Pere, Wausau and Kingsford, MI High or Low Overloaded Facility Sussex Chenequa Oconomowoc Cooney Nashotah Cottonwood (WE) Hartland Summit Oconomowoc Lake Delafield Pewaukee Waukesha Dousman Sullivan Wales Waukesha Merrill Hills North Prairie Eagle Palmyra Mukwonago Mukwonago WhitewaterWhitewater Lakehead Delavan Bluff Creek East Troy Tibbits Sugar Creek Wilcox Parkview Sunrise Tripp Rd Waterford REC LaPrairie Marine Paddock REC Newark Cranston Northwest Beloit East Beloit Colley Rd Shirland Ave Beloit REC Bradford West Darien Scot Forge Delavan Air Liquide North Lake Geneva Williams Bay Williams Bay Brick Church Walworth Walworth Sharon Burlington Burlington Bristol (ALTE) Delavan Southwest Delavan Darien ClintonScot Forge Racine Lafayette Elkhorn Elkhorn Walworth Venture BOC Gasses Turtle Rock River Performance Criteria Exceeded and Other Constraints (00-0) PLANNING ZONE Merton Lac La Belle REC Harmony Milton Lawns McCue Badger Pump STA Bass Creek Brodhead North Orfordville Orfordville REC Orfordville Bark River Milton Russell Albany Concord SW YD REC Fulton LaMar Blackhawk SW YD (ALTE) Park Ave ZONE 4 Slinger Hartford Rubicon University (WE) Edgerton North Monroe Hazel Green W I S C O N S I N Hartford Butler Ridge Clyman Brooklyn New GlarusNew Glarus DPC Argyle DPC Gratiot Wiota Miner Hustisford Hustisford Reeseville St Lawrence Arthur Road North Madison De Forest Monticello DarlingtonDarlington Cuba City Cuba City Columbus Muni Washington Iron Ridge Dodge Lowell Glacier Deforest Monticello (ALTE) DPC LaMont DPC Platteville PotosiTennyson Columbus South Spring Brook Mayville Juneau Columbus (ALTE) Columbus Brooklyn Belmont Belmont Platteville Beaver Dam East Juneau Northside Horicon Horicon South Beaver Dam Fall River Hampden Evansville Nelson Dewey SW YD ZONE Dane ACEC Doylestown Arlington Dane Belleville Belleville Hollandale Blanchardville DPC Stoneman ZONE Arlington Lodi Beaver Dam ACEC Calamus Kewaskum Mayville Theresa Horicon Ind Park Hubbard Beaver Dam rd St Center St Doylestown Auburn Kekoskee Academy Okee Sauk City Rewey Glen Haven Cassville Rio Poynette Poynette Lodi Industrial Park Dam Heights Eagle View Lodi Prairie Du Sac Plant Milwaukee Valve Prairie Du Sac 9th St Tower Substation Sauk Prairie Sauk City Phillips St North Beaver Dam Rio Pumping Station Columbia BarabooMoore St Randolph Business Park North Side Bird St Division Street Yahara River Colorado Waterloo Sun Prairie Spring Green Mazomanie Arena Waunakee Watertown Lone Rock Centennial Park Stony Brook Sun Prairie Lakehead Waterloo Spring Green Huiskamp Burke Marshall Westport South Mazomanie Industrial Wick Drive Wyoming Valley Black EarthBlack Earth Boxelder Reiner Rd American Cross Plains East Towne Gaston Rd Pheasant Branch Ruskin Stage Coach SW STA Cross Plains Mendota Middleton Sprecher Cottage Grove Blount Cottage Grove Pleasant View Walnut GIS Johnson Creek Gateway Pflaum Lake Mills Madison Dane Jefferson AGA Gas Timberlane Tokay Deerfield London Wingra Monona McFarland Crawfish River West Towne Femrite Jefferson Fitchburg Cambridge Hooterville Syene Mount HorebMount Horeb Jefferson McFarland Barneveld Blue Mounds Cambridge Lakehead Cambridge Oak Ridge Colloday Point Kegonsa Cross Country Ridgeway Rockdale North East Mount Horeb Muni Lands End Verona Verona Rockdale Fitchburg Dodgeville Fort Atkinson Christiana Dodgeville North Stoughton Oregon Stoughton Stoughton Fort Atkinson Oregon Stoughton South Forward Stoughton East Boscobel Muni Boscobel Wauzeka Wyocena Caledonia (ALTE) Cambria Campbellsport Lomira Lone Rock Avoca MuscodaMuscoda Sanborn Butternut Brownsville ACEC Cambria North Randolph Fox Lake Fox Lake (ALTE) Cambria Randolph Pardeeville Merrimac Richland Crawford Pardeeville Manley Sand Columbia SW YD (ALTE) Island Baraboo Merrimac Eagle Blue River Portage Portage Ind Park Portage Badger Ordinance Works Pine River (ALTE) Bell Center Eastman North Freedom Loganville Loganville Richland CenterJames Olson Boaz Mount SterlingGays MillsGays Mills Lynxville Rock Springs Kirkwood Fond du Lac Waupun Hamilton St Trienda Lake Delton Fox Hills Richland Ferryville Seneca Birchwood Rock Springs Eden Forward Energy Center Friesland ACEC Lewiston Lake Delton Zobel Reedsburg Nishan Ironton Reedsburg Reedsburg Artesian Cazenovia Viroqua Alto Lakehead Portage Dell Creek Kilbourn La Valle Green Lake Oakfield Oakfield Waupun Main Waupun Wisconsin Dells Vernon Koch Oil Markesan Kingston M a r q u e t t e Endeavor ACEC Roslin Adams Juneau Wonewoc Mackford Prairie Endeavor DPC Lyndon Station Lake Geneva Lake Geneva South Lake Geneva Zenda Cobblestone Sharon Twin Lakes (ALTE) Katzenberg Twin Lakes Genoa City Existing Transmission Facilities.! * # * # ATC Office Location ATC Substation, Switchyard or Terminal Non-ATC Substation, Switchyard or Terminal A ATC Transmission Line (width = voltage) Non-ATC Transmission Line

16 Figure ZS-0 Stoddard Chaseburg Hillsboro Westby Hillsboro Wonewoc Juneau Wonewoc DPC Lyndon Station Adams Wisconsin Dells Muni Finnegan Wisconsin Dells Vernon Zobel Reedsburg Nishan Ironton Reedsburg Reedsburg Artesian Cazenovia Yuba Viola De Soto Sauk Soldiers Grove DPC Bell Center Crawford Blue River Boscobel Brisbois La Pointe Wauzeka Boscobel Muni Eastside King (king) Woodman Gran Grae Hillside Prairie du Chien Fennimore Mount Hope Patch Grove Bagley BloomingtonBloomington Grant Lancaster Distribution Lancaster Lancaster Glen Haven Cassville Potosi Nelson Dewey SW YD Cassville Pioneer(ALTE) Mcgregor (ALTE) Hillman PotosiTennyson Summit Lake (ALTW) Kieler M I C H I G A N Okee Arlington Lodi Juneau Columbus Hampden Columbus South Columbus (ALTE) Columbus Muni Currently, ATC owns or operates transmission facilities in 50 Wisconsin counties and in 5 Michigan counties. Facilities include: * Approximately 945 miles of transmission lines * 96 wholly owned substations * 40 jointly owned substations * ATC offices in Madison, Cottage Grove, Pewaukee, De Pere, Wausau and Kingsford, MI Butler Ridge Hartford Slinger North Madison De Forest Cuba City Monticello Lafayette Benton Benton DarlingtonDarlington DPC Gratiot Wiota Miner Milton Russell DPC Shullsburg Shullsburg Shullsburg Gratiot DPC Argyle Argyle North Monroe Green Jennings Rd SW STA Browntown South Wayne REC Center Albany Browntown Idle Hour Monroe Monroe Central Albany (ALTE) Rock Brodhead FootvilleFootville Orfordville Brodhead North Orfordville REC Orfordville Brodhead Central Brodhead South South Monroe Blacksmith Spring Grove Hazel Green Bass Creek Brodhead SW STA Milton Lawns McCue Viking Janesville PLANNING ZONE High or Low Overloaded Facility Waterford REC Harmony Traxler Tibbits Sugar Creek Wilcox Parkview Sunrise Venture Tripp Rd Badger Pump STA REC LaPrairie BOC Gasses Turtle Rock River Marine Paddock REC Newark Cranston Northwest Beloit East Beloit Colley Rd Shirland Ave Beloit Performance Criteria Exceeded and Other Constraints (0-05) ZONE 4 St Lawrence Arthur Road Hartford Rubicon Clyman Reeseville West Bend Washington Hustisford Hustisford Lowell Glacier Iron Ridge Academy Arlington Spring Brook Mayville Beaver Dam East Juneau Northside Horicon Horicon South Beaver Dam Fall River Kewaskum Mayville Theresa Deforest Dane Dane ACEC Doylestown Poynette Beaver Dam ACEC Calamus Kekoskee Horicon Ind Park Hubbard Beaver Dam rd St Center St Blackhawk SW YD (ALTE) Park Ave REC Shaw East Rockton W I S C O N S I N Modified: April 7, 00 Poynette Dodge Doylestown Monticello (ALTE) Cuba City New London (ALTW) ZONE 5 Rio Auburn Lone Rock Avoca DPC LaMont DPC Platteville Dickeyville ZONE Troy Lodi Industrial Park Dam Heights Eagle View Lodi Prairie Du Sac Plant Milwaukee Valve Prairie Du Sac 9th St Tower Substation Sauk Prairie Sauk City Phillips St Sauk City BelmontBelmont Platteville Elmo ZONE Rio Pumping Station Evansville DPC Stoneman ZONE Wyocena Columbia BarabooMoore St Randolph North Beaver Dam Campbellsport Lomira Business Park North Side Bird St Division Street Yahara River Colorado Waterloo Sun Prairie Spring Green Mazomanie Avoca Arena Waunakee Watertown Concord SW YD Lone Rock Centennial Park Bark River Stony Brook Sun Prairie Lakehead Waterloo Spring Green Huiskamp Burke Marshall Sussex Westport South Mazomanie Industrial Wick Drive Wyoming Valley Merton Lac La Belle Black EarthBlack Earth Boxelder Reiner Rd Sussex American Chenequa East Towne Gaston Rd Cottonwood (WE) OconomowocCooney Nashotah Pheasant Branch Ruskin Cross PlainsCross Plains Hartland Mendota Middleton Duplainville Sprecher Cottage Grove Oconomowoc Lake Summit Blount Pleasant View Walnut GIS Cottage Grove Johnson Creek Delafield Gateway Pflaum Lake Mills Stage Coach SW STA Pewaukee Madison Dane Jefferson AGA Gas London Tokay Timberlane Deerfield Waukesha Wingra Highland McFarland Crawfish River Waukesha Waukesha West Towne Femrite Jefferson Fitchburg Lakehead Cambridge Dousman Hooterville Syene Merrill Hills Mount Horeb Sullivan Wales McFarland Mount Horeb Barneveld Blue Mounds Jefferson Cambridge Oak Ridge Colloday Point Kegonsa Iowa Ridgeway Cross Country Cambridge Rockdale North East Mount Horeb Muni Lands End Verona Verona Eden Rockdale Fitchburg Dodgeville Montfort Cobb Fort Atkinson Christiana Dodgeville North Stoughton North Prairie Oregon Stoughton Stoughton Fort Atkinson Oregon Stoughton South Linden Big Bend Forward Livingston Stoughton East Eagle Palmyra Mukwonago Mukwonago New Hollandale Brooklyn University (WE) Mineral Point Rock Branch BellevilleBelleville Hollandale Mineral Point Rewey Dana Corp Brooklyn Sheepskin Saunders Creek WhitewaterWhitewater Rewey Blanchardville Edgerton Lakehead Delavan New GlarusNew Glarus Blanchardville Bluff Creek East Troy Evansville Muni REC Fulton LaMar Boscobel Muni Boscobel Wauzeka Plain MuscodaMuscoda Blue River Steuben Manley Sand Cambria Pardeeville Butternut Brownsville ACEC Cambria North Randolph Fox Lake Fox Lake (ALTE) Cambria Randolph Sanborn Merrimac Richland Eagle Pardeeville Caledonia (ALTE) Merrimac Fond du Lac Waupun Hamilton St Trienda Columbia SW YD (ALTE) Island Baraboo Badger Ordinance Works Pine River (ALTE) Bell Center Eastman North Freedom LoganvilleLoganville Richland Center James Olson Boaz Mount SterlingGays MillsGays Mills Lynxville Rock Springs Kirkwood Forward Energy Center Friesland Portage Portage Ind Park Portage Lake Delton Fox Hills Richland Ferryville Seneca Birchwood Rock Springs Lime Ridge Readstown ACEC Lewiston Lake Delton La Valle La Farge Viroqua Alto Waupun Main Waupun Green Lake Lakehead Portage Dell Creek Kilbourn Genoa ACEC Roslin M a r q u e t t e Endeavor Walworth REC Bradford West Darien Scot Forge Air Liquide Bristol (ALTE) Delavan Southwest Delavan Delavan North Lake Geneva Williams Bay Williams Bay Brick Church Walworth Sharon Burlington Burlington ElkhornElkhorn Darien ClintonScot Forge Rochester Racine Lafayette Walworth Lake Geneva Lake Geneva South Lake Geneva Zenda Cobblestone Sharon Twin Lakes (ALTE) Katzenberg Genoa City Twin Lakes Existing Transmission Facilities ATC Office Location ATC Substation, Switchyard or Terminal Non-ATC Substation, Switchyard or Terminal Generation ATC Transmission Line (width = voltage) Non-ATC Transmission Line

17 Figure ZS- Stoddard Chaseburg Hillsboro Westby Hillsboro Wonewoc Wonewoc Juneau DPC Lyndon Station Adams Wisconsin Dells Muni Finnegan Wisconsin Dells Vernon Zobel Reedsburg Nishan Ironton Reedsburg Reedsburg Artesian Cazenovia Yuba Viola Lime Ridge Readstown De Soto Sauk Soldiers Grove Lynxville DPC Bell Center Boscobel Muni Boscobel Boscobel Brisbois La Pointe Boscobel Muni Eastside King (king) Woodman Gran Grae Hillside Prairie du Chien Fennimore Mount Hope Patch Grove Bagley BloomingtonBloomington Grant Lancaster Distribution Lancaster Lancaster Glen Haven Cassville Potosi Nelson Dewey SW YD Cassville Pioneer(ALTE) Mcgregor (ALTE) Hillman PotosiTennyson Summit Lake (ALTW) Kieler M I C H I G A N Arlington Arlington Columbus Hampden Columbus South Columbus (ALTE) Currently, ATC owns or operates transmission facilities in 50 Wisconsin counties and in 5 Michigan counties. Facilities include: * Approximately 945 miles of transmission lines * 96 wholly owned substations * 40 jointly owned substations * ATC offices in Madison, Cottage Grove, Pewaukee, De Pere, Wausau and Kingsford, MI St Lawrence Arthur Road Hustisford Hartford Butler Ridge Hartford Rubicon Clyman Reeseville West Bend Washington Iron Ridge Hustisford Lowell Glacier Slinger North Madison De Forest Cuba City Benton DarlingtonDarlington DPC Gratiot Wiota Hazel Green Miner Russell Monticello Lafayette Benton Milton Monticello (ALTE) DPC Shullsburg Shullsburg Shullsburg Gratiot DPC Argyle Argyle North Monroe Green Jennings Rd SW STA Browntown South Wayne REC Center Albany Browntown Idle Hour Monroe Monroe Central Albany (ALTE) Rock Brodhead FootvilleFootville Brodhead North Orfordville REC Orfordville Brodhead Central Brodhead South South Monroe Blacksmith Brodhead SW STA Janesville Bass Creek Orfordville Spring Grove Milton Lawns McCue Viking Traxler Tibbits Sugar Creek Wilcox Parkview Sunrise Venture Tripp Rd Badger Pump STA REC LaPrairie BOC Gasses Turtle Rock River Marine Paddock REC Newark Cranston Northwest Beloit East Beloit Colley Rd Shirland Ave Beloit PLANNING ZONE High or Low Overloaded Facility Waterford REC Harmony Performance Criteria Exceeded and Other Constraints (05-00) ZONE 4 Juneau Northside Horicon Horicon South Beaver Dam Juneau Columbus Muni Spring Brook Mayville Beaver Dam East Deforest Dane Dane Beaver Dam Fall River Kewaskum Mayville Theresa Academy Okee Lodi ACEC Doylestown Kekoskee Horicon Ind Park Hubbard Beaver Dam rd St Center St ACEC Calamus Doylestown Poynette Poynette Dodge Blackhawk SW YD (ALTE) Park Ave REC Shaw East Rockton W I S C O N S I N Modified: April 7, 00 Rio Auburn Lone Rock Avoca Cuba City New London (ALTW) ZONE 5 Troy DPC LaMont DPC Platteville Dickeyville ZONE Richland Lodi Industrial Park Dam Heights Eagle View Lodi Prairie Du Sac Plant Milwaukee Valve Prairie Du Sac 9th St Tower Substation Sauk Prairie Sauk City Phillips St Sauk City BelmontBelmont Platteville Elmo ZONE Rio Pumping Station Evansville DPC Stoneman ZONE Wyocena Columbia BarabooMoore St Randolph North Beaver Dam Campbellsport Lomira Business Park North Side Bird St Division Street Yahara River Colorado Waterloo Sun Prairie Spring Green Mazomanie Avoca Arena Waunakee Watertown Concord SW YD Lone Rock Centennial Park Bark River Stony Brook Sun Prairie Lakehead Waterloo Spring Green Huiskamp Burke Marshall Sussex Westport South Mazomanie Industrial Wick Drive Wyoming Valley Merton Lac La Belle Black EarthBlack Earth Boxelder Reiner Rd Sussex American Chenequa East Towne Gaston Rd Cottonwood (WE) OconomowocCooney Nashotah Pheasant Branch Ruskin Cross PlainsCross Plains Hartland Mendota Middleton Duplainville Sprecher Cottage Grove Oconomowoc Lake Summit Blount Pleasant View Walnut GIS Cottage Grove Johnson Creek Delafield Gateway Pflaum Lake Mills Stage Coach SW STA Pewaukee Madison Dane Jefferson AGA Gas London Tokay Timberlane Deerfield Waukesha Wingra Highland McFarland Crawfish River Waukesha Waukesha West Towne Femrite Jefferson Fitchburg Lakehead Cambridge Dousman Hooterville Syene Merrill Hills Mount Horeb Sullivan Wales McFarland Mount Horeb Barneveld Blue Mounds Jefferson Cambridge Oak Ridge Colloday Point Kegonsa Iowa Ridgeway Cross Country Cambridge Rockdale North East Mount Horeb Muni Lands End Verona Verona Eden Rockdale Fitchburg Dodgeville Montfort Cobb Fort Atkinson Christiana Dodgeville North Stoughton North Prairie Oregon Stoughton Stoughton Fort Atkinson Oregon Stoughton South Linden Big Bend Forward Livingston Stoughton East Eagle Palmyra Mukwonago Mukwonago New Hollandale Brooklyn University (WE) Mineral Point Rock Branch BellevilleBelleville Hollandale Mineral Point Rewey Dana Corp Brooklyn Sheepskin Saunders Creek WhitewaterWhitewater Rewey Blanchardville Edgerton Lakehead Delavan New GlarusNew Glarus Blanchardville Bluff Creek East Troy Evansville Muni REC Fulton LaMar Blue River Wauzeka Manley Sand Cambria Pardeeville Butternut Brownsville ACEC Cambria North Randolph Fox Lake Fox Lake (ALTE) Cambria Randolph Sanborn Merrimac Plain MuscodaMuscoda Blue River Steuben Pardeeville Caledonia (ALTE) Merrimac Eagle Crawford Wauzeka North Freedom LoganvilleLoganville Fond du Lac Waupun Hamilton St Trienda Columbia SW YD (ALTE) Island Baraboo Badger Ordinance Works Pine River (ALTE) Bell Center Eastman Rock Springs Kirkwood Rock Springs Forward Energy Center Friesland Portage Portage Ind Park Portage Lake Delton Fox Hills Richland Center James Olson Boaz Mount SterlingGays MillsGays Mills Seneca Birchwood Richland Ferryville ACEC Lewiston Lake Delton La Valle La Farge Viroqua Alto Waupun Main Waupun Green Lake Lakehead Portage Dell Creek Kilbourn Genoa ACEC Roslin M a r q u e t t e Endeavor Walworth REC Bradford West Darien Scot Forge Air Liquide Bristol (ALTE) Delavan Southwest Delavan Delavan North Lake Geneva Williams Bay Williams Bay Brick Church Walworth Sharon Burlington Burlington ElkhornElkhorn Darien ClintonScot Forge Rochester Racine Lafayette Walworth Lake Geneva Lake Geneva South Lake Geneva Zenda Cobblestone Sharon Twin Lakes (ALTE) Katzenberg Genoa City Twin Lakes Existing Transmission Facilities ATC Office Location ATC Substation, Switchyard or Terminal Non-ATC Substation, Switchyard or Terminal Generation ATC Transmission Line (width = voltage) Non-ATC Transmission Line

18 Figure ZS- Stoddard Chaseburg Hillsboro Westby Wonewoc Hillsboro Juneau Wonewoc DPC Lyndon Station Adams Wisconsin Dells Muni Finnegan Wisconsin Dells La Farge Genoa Vernon Yuba Viola De Soto Sauk Soldiers Grove DPC Bell Center Plain Troy Crawford Steuben Blue River Lone Rock Avoca Avoca Lone Rock Spring Green Boscobel Boscobel Muni Eastside King (king) Wauzeka Woodman Wauzeka Brisbois Spring Green Wyoming Valley Boscobel Muni Boscobel Gran Grae Hillside Highland Prairie du Chien Fennimore Mount Hope Iowa Eden Montfort Lands End Dodgeville Cobb Bagley BloomingtonBloomington Grant Lancaster Distribution Lancaster Mazomanie Industrial Wick Drive Black EarthBlack Earth Mineral Point Nelson Dewey SW YD Cassville Hillman PotosiTennyson Dickeyville Summit Lake (ALTW) Kieler Hazel Green W I S C O N S I N ZONE ZONE Modified: April 7, 00 DarlingtonDarlington DPC Gratiot Wiota Miner DPC Shullsburg Shullsburg Shullsburg Columbus Muni Sun Prairie Sun Prairie South Reiner Rd Waterloo Lakehead Waterloo Marshall Gratiot Argyle Oregon Stoughton Stoughton South Brooklyn Stoughton Currently, ATC owns or operates transmission facilities in 50 Wisconsin counties and in 5 Michigan counties. Facilities include: * Approximately 945 miles of transmission lines * 96 wholly owned substations * 40 jointly owned substations * ATC offices in Madison, Cottage Grove, Pewaukee, De Pere, Wausau and Kingsford, MI Watertown Jennings Rd SW STA Browntown South Wayne Browntown Idle Hour Monroe Monroe Central Hartford Concord SW YD Slinger FootvilleFootville Brodhead North Orfordville REC Orfordville Brodhead Central Brodhead South South Monroe Blacksmith Brodhead SW STA Waukesha Wales Pewaukee Waukesha Waukesha Merrill Hills Big Bend Eagle Palmyra Bluff Creek Mukwonago Mukwonago East Troy Milton Lawns McCue Viking Janesville Waterford REC Harmony Traxler Tibbits Sugar Creek Wilcox Parkview Sunrise Venture Tripp Rd Badger Pump STA REC LaPrairie BOC Gasses Turtle Rock River Blackhawk SW YD (ALTE) Park Ave REC Shaw East Rockton Overloaded Facility Duplainville WhitewaterWhitewater Paddock REC Newark Cranston Northwest Beloit East Beloit Colley Rd Shirland Ave Beloit High or Low Hartland North Prairie Lakehead Delavan Marine PLANNING ZONE Sussex Delafield Dousman Sullivan Sussex Cottonwood (WE) Milton Bass Creek Orfordville Spring Grove Summit Oconomowoc Lake REC Fulton LaMar REC Center Brodhead Chenequa OconomowocCooney Nashotah University (WE) Dana Corp Saunders Creek Russell Rock Merton Lac La Belle Stoughton East Evansville Muni Albany (ALTE) Bark River Fort Atkinson Sheepskin Albany Green Butler Ridge Fort Atkinson Edgerton North Monroe Hartford Rubicon Boxelder Christiana North Stoughton New GlarusNew Glarus DPC Argyle St Lawrence Arthur Road Hustisford Clyman Reeseville West Bend Washington Iron Ridge Hustisford Lowell Stony Brook Performance Criteria Exceeded and Other Constraints (00-05) ZONE 4 ZONE 5 Benton Benton New London (ALTW) M I C H I G A N Lafayette Columbus (ALTE) Glacier Business Park Monticello Cuba City Cuba City Columbus South Monticello (ALTE) DPC LaMont DPC Platteville Bird St Brooklyn BelmontBelmont Platteville Juneau Rockdale BellevilleBelleville Hollandale Blanchardville Elmo ZONE North Side Division Street Yahara River Colorado Waunakee Centennial Park Huiskamp Burke Westport Oregon New Hollandale Rewey Pioneer(ALTE) Mcgregor (ALTE) Juneau Northside Horicon Horicon South Beaver Dam Deforest North Madison De Forest Evansville Potosi Columbus Hampden Dane Forward Blanchardville DPC Stoneman Beaver Dam Fall River Arlington Arlington Dane ACEC Doylestown Spring Brook Mayville Beaver Dam East Horicon Ind Park Hubbard Beaver Dam rd St Center St ACEC Calamus Kewaskum Mayville Theresa Academy Okee Lodi Dodge Doylestown Fitchburg Glen Haven Cassville Rio Auburn Kekoskee American East Towne Gaston Rd Pheasant Branch Ruskin Cross PlainsCross Plains Mendota Middleton Sprecher Cottage Grove Blount Pleasant View Walnut GIS Cottage Grove Johnson Creek Gateway Pflaum Lake Mills Stage Coach SW STA Madison Dane Jefferson AGA Gas London Tokay Timberlane Deerfield Wingra McFarland Crawfish River West Towne Femrite Jefferson Fitchburg Lakehead Cambridge Hooterville Syene Mount Horeb McFarland Mount Horeb Barneveld Blue Mounds Jefferson Cambridge Oak Ridge Colloday Point Kegonsa Ridgeway Cross Country Cambridge Rockdale North East Mount Horeb Muni Verona Verona Mineral Point Rock Branch Rewey Lancaster Mazomanie Arena Linden Livingston Rio Pumping Station Campbellsport Lomira Randolph North Beaver Dam Poynette Poynette Dodgeville Patch Grove Wyocena Columbia BarabooMoore St Lodi Industrial Park Dam Heights Eagle View Lodi Prairie Du Sac Plant Milwaukee Valve Prairie Du Sac 9th St Tower Substation Sauk Prairie Sauk City Phillips St Sauk City Richland MuscodaMuscoda Manley Sand Cambria Pardeeville Butternut Brownsville ACEC Cambria North Randolph Fox Lake Fox Lake (ALTE) Cambria Randolph Sanborn Merrimac Eagle Blue River Pardeeville Caledonia (ALTE) Merrimac Fond du Lac Waupun Hamilton St Trienda Columbia SW YD (ALTE) Island Baraboo Badger Ordinance Works Pine River (ALTE) Bell Center Eastman La Pointe North Freedom LoganvilleLoganville Richland Center James Olson Boaz Mount SterlingGays MillsGays Mills Lynxville Rock Springs Kirkwood Forward Energy Center Friesland Portage Portage Ind Park Portage Lake Delton Fox Hills Richland Ferryville Seneca Birchwood Rock Springs Lime Ridge Readstown ACEC Lewiston Lake Delton Zobel Reedsburg Nishan Ironton Reedsburg Reedsburg Artesian Cazenovia Viroqua Alto Waupun Main Waupun Green Lake Lakehead Portage Dell Creek Kilbourn La Valle ACEC Roslin M a r q u e t t e Endeavor Walworth REC Bradford West Darien Scot Forge Air Liquide Bristol (ALTE) Delavan Southwest Delavan Delavan North Lake Geneva Williams Bay Williams Bay Brick Church Walworth Sharon Burlington Burlington ElkhornElkhorn Darien ClintonScot Forge Rochester Racine Lafayette Walworth Lake Geneva Lake Geneva South Lake Geneva Zenda Cobblestone Sharon Twin Lakes (ALTE) Katzenberg Genoa City Twin Lakes Existing Transmission Facilities ATC Office Location ATC Substation, Switchyard or Terminal Non-ATC Substation, Switchyard or Terminal Generation ATC Transmission Line (width = voltage) Non-ATC Transmission Line

19 Figure ZS-4 8 Y- Hazel Green Brodhead SW STA REC Newark SW STR Shirland Ave SW STR Dickinson (ALTE) 85 X- REC Clinton SW STR Sharon SW STR Clinton SW STR (ALTE) X-4 67 CGS G 4 64 Y-5 Brick Church Sharon X X X REC Greendale LaPrairie X79 X-79 9 Franklin 86 X- 00 X-9 X-5 Root River 86 Oak Creek X- 4 Y- Enzyme BioSystems Raymond Colley Rd 4 XNX-5 E4 East Beloit Park Ave X-4 Dickinson (ALTE) Y-5 East Union Rockton Grove Janesville / Beloit Area Air Liquide Tap Air Liquide Paris 4 K E N O S H A South Lake Geneva 4 Y- Lake Geneva Zenda 50 Silver Lake Y-5-ALE Zenda SW STR 75 Paddock Lake 0 Cobblestone 4 Sharon 8 50 Brookdale Tap 6 REC Shaw Walworth Walworth X- X- 99 Shirland Ave Williams Bay Fontana-onGeneva Lake Y SA UG 4 80 X- X-44 Y- East Beloit Williams Bay SW STR West Darien NWH G6 KANG8 North Lake Geneva X-55 X-4 4 Darien X L-CYP X- 80 X- Southwest Delavan Clinton (ALTE) Beloit X-5 4 Park Ave 40 Delavan X-79 Williams Bay X- Blackhawk SW YD (ALTE) X-79 REC Bradford 79 6L 4 X-96 Y- RU BG 465 G-W HA JEFG5 JEFG5 X-69 Y-79 X-9 X-4 X-4 Northwest Paddock Beloit X-5 Northwest Beloit Y- Tap Colt 54 Industries W- 9 Spring Grove X-79 8Tichigan I L L I N O I S Elkhorn 4 4rd St Term 87K6 654 Elkhorn X-8 Delavan Turtle Town Line Y4 Rd (ALTE) X-5 Y-7 W A L W O R T H 45 Colt Industries R A C I Bristol (ALTE) REC LaPrairie Beloit Burlington 9 Rock X79 River BOC Gasses North Lake Geneva Tap Y- 67 X-8 X-8 W- 4 W- 0 Blacksmith Blacksmith SW STR Y-0 New London (ALTW) X- Y5 8 R O C K Browntown South Wayne Brodhead Muni SW STR X Lafayette Burlington Sunrise X-9 Venture Y-7 Monroe Central Janesville General SW YD X-4 X- Browntown South Monroe Sugar Creek Lincoln Venture Marine 778K5 Cranston Blackhawk SW YD (ALTE) Tibbits West Milwaukee West Allis Rock Turtle Town X-7 4 River Line XRd (ALTE) 79 6 Rochester 9 Janesville Tripp Rd Orfordville Waterford 9 W- Wilcox 8 Y- REC Orfordville Orfordville SW STR Bluff Creek 89 X-7 Y87 Monroe Central SW STR Brodhead South Badger Pump STA Lakehead Delavan Tap East Troy Y- 5 Monroe Y-55 Shullsburg 8 YBrodhead North X- REC Harmony SW STR McCue X-6 Badger Pump STA Tap 0 X-79 Shullsburg 6 N- Bass Creek 69 Jennings Rd SW STA DPC Shullsburg Miner X- X- North Monroe Parker High School SW STR 4 44 Valley (WE) Branch Northwest Beloit Paddock Y-7 X X- Benton REC Center REC Center Tap X- Summit Lake (ALTW) X-49 Y-4 DPC Gratiot Cuba City South SW STR Albany Footville X-49 X-49 DPC Gratiot SW STR Cuba City G R E E N Argyle Darlington Darlington L A F A Y E T T E DPC Argyle Milton X- 4 Russell 59 DPC LaMont 6 Y-04 4 Monticello (ALTE) Y-5 X-4 Hillman Kieler Monticello Monticello SW STR Belmont Tennyson Potosi I O W A Fulton SW STR Y-6 REC Fulton X-9 Evansville Union Townline SW STR Y-09 DPC Platteville Tap Y-65 X-5 DPC Platteville Lakehead Delavan 65 5 West Junction Y St Martins BOC Gasses L- ER G7 Walker 6 Cassville X-5 Whitewater Evansville Muni Belmont Mcgregor (ALTE) Dana Corp SW STR 54 Mukwonago 505 Everett Park 484 Hill Muskego Big Bend Whitewater R O C K Y Pioneer(ALTE) X Platteville DPC Stoneman X-5 New Glarus 6 Edgerton Haymarket Square X-9 96th St Brookdale X Edgewood K6 67 Mukwonago 59 University (WE) Y Brooklyn Brooklyn 4 Eagle Palmyra W A U K E S H A Dana Corp Blanchardville Moorland New Berlin 54 Y- Glen Haven E Q- Y- 7 87K6 995 Tripp Rd North Prairie Y- 8 Nelson Dewey SW YD 8 Sheepskin Arcadian Merrill Hills Fort Atkinson Wauwatosa Center 79 Sunrise 8th St Janesville 6 504O Connor Y50 YD General SW Stoughton Rewey 6 X- Cassville Belleville Belleville Wales Fort Atkinson X- 4X- 4 Bluemound Lancaster 6 X- Hollandale 9 Jefferson Sullivan 4 Elm Grove Lancaster Y- Lancaster Distribution Rock Branch Mineral Mineral Point SW Point STR 8 Janesville 8 YWaukesha Waukesha Y0 Bloomington 6 X- Y Forward SW STR 70 Butler Traxler Tosa Brookfield Pewaukee Dousman X- Y-5 Forward Livingston Jefferson North Stoughton Muni SW STR Oregon Viking Duplainville 4 6 Range Line Dist X- Sidney Term Milton Custer Lawns Term Wilcox Parkview Fiebrantz Butler 90 Pewaukee J E F F E R S O N 0 Y- Bloomington Oregon Y-4 Bagley 9 Linden G R A N T Lakehead Cambridge Rockdale X- 6 X- Kegonsa Cottonwood (WE) 55 Crawfish River Granville Y- Patch Grove Dodgeville 0 X-9 Lakehead Cambridge 66 Tap 66 Cambridge Cambridge SW STR Cambridge X-8 65 X-59 XRockdale Christiana G-CHR 6 X-7 Y-8 Verona 6 Y- Oak Ridge X8 Colloday 858 Point Y- 9 Montfort Dodgeville Sun Valley Sw Str Y-5 Cobb Y-6 McFarland Cottage Grove X- Eden Mount Horeb Fitchburg 694 London SW STR McCue Tamarack River Hills REC Harmony Milwaukee Menomonee Falls Mill Rd Verona London Y-4 6 Y-4 Lands End North East Mount Horeb Muni McFarland Fitchburg Syene 8 57 Fennimore 8 Ridgeway I O W A Mount Horeb Lake Mills Sussex Sussex 465 Oconomowoc Lake Nashotah Summit Delafield Deerfield AGA Gas Fen Oak Merton 4 Lannon Chenequa Oconomowoc Cooney 66 Hooterville 7 X- Cross Country L Gaston Rd Sprecher 75 Milton Thiensville LaMar 68th St 5066 X-9 Blue Mounds Monona Nine Springs Wingra 9 66 Bark River Cottage Grove Pflaum Tokay East Campus Madison La Pointe Barneveld Royster Walnut Blount GIS 94 8 X D A N E Y- Towne 8 Y- Highland Mount Hope Y6 8 X-5 W- 7 Y Pleasant View West Gran Grae Shorewood Hills Reiner Rd Sprecher Tap 80 Gateway Concord SW YD 4 90 Mequon Swan Timberlane Blackhawk (MGE) Germantown SW YD W West Timberlane SW STR Middleton Y-6 Pheasant Branch 86 X Wauzeka DPC Prairie Du Chien X- King (king) Sycamore SW YD Maple Bluff Middleton Burke Tap G-DPV 7 Cross Plains Fulton Russell Stony Brook BOEG6 BOEG6 JEF G5 Marshall 6 0 Y- Watertown 9 Waterloo 5 FG JE 6 Y- Black Earth SW STR East Towne Y-4 0 American Black Earth Boscobel Muni Eastside Woodman Burke Huiskamp Westport X-85 Wyoming Valley Colorado X Boscobel Waunakee X-85 Arena Eastman Wick Drive 5875 Arena 67 X- Y-70 Spring Green Token Creek Waunakee Industrial Park 9 X- X- 7 Mazomanie Sun Bird St Tap Prairie Mequon Y- 6 Germantown REC 5 Bird St Yahara River X Spring Green Division Street Lone Rock Avoca 59 Cedarburg South 66 Muscoda Y- 4 Blue River North Side Waunakee Muni SW STR Y- Y- 79 Muscoda Blue River Avoca SW STR 60 Y-7 Grafton 60 Cedarburg W A S H I N G T O N Business Park Colloday Point W- 4 Blue River SW STR Lone Rock Avoca Hampden SW STR 74 Jackson Maple (WE) X-6 Steuben Muscoda Muni Distrib SW STR Y-04 De Forest X- 60 Y- 6 Y-4 9 C R A W F O R D Y-85 Dane Y- 6 Deforest Saukville X-90 Rubicon BG RU 6 90 North Madison 45/8 kv North Madison Dane BG RU Neosho Reeseville Sauk City Phillips St Lynxville Sauk Prairie Y-4 Plain Eagle X87 Bell Center DPC Prairie Du Brisbois Chien SW STR Lodi SW STR Prairie Du Sac 9th St Clyman Columbus South Lodi Okee SW STR Dam Heights South Tap Tower St Tap Hampden Y-7 Tower Substation C O L U M B I A Lodi DPC Bell Center Lodi Industrial Park X-6 Y-8 X8 Gays Mills Dam Heights North Tap 4 UG SA Edgerton Saunders Creek 8 5 Y Y6 Pine River (ALTE) 858 X Oak Ridge Slinger Butler Ridge Charter Steel 8 85 Hartford 4 75 X- Y-6 X-5 X5 X-70 X-5 X7 Y-5 Y-6 4 X-7 X-7 X6 X7 Y-05 Lowell 6 Charter Steel Sw Str Fitchburg Hartford 5 FG HT BG RU Gays Mills SW STR Lodi Ind Park SW STR Fitchburg Pleasant Valley 80 Hustisford Columbus Arlington 8 8 Syene 694 Verona Y 60 Arlington SW STR Arlington 88 Iron Ridge Cross Country Hustisford Okee James Olson 7 Gays Mills Mount Sterling Fall River Fall River Academy Richland Center Boaz y-69 Fall River SW STR Poynette SW STR McFarland 8 Poynette Merrimac SW STR Madison Nine Newburg Springs Glacier Juneau Northside Juneau Fredonia ACEC Doylestown SW STR Poynette Merrimac Ferryville Y-69 West Barton Bend Horicon Juneau Industrial Sw Str Wingra South Beaver Dam Monona L- SE C ACEC Calamus 57 AGA Gas Pflaum Fredonia Hubbard 69 5 West Towne O Z A Royster U K E E Blount Doylestown Merrimac R I C H L A N D Horicon Ind Park Y- 4 Y- 0 W6 75 Tokay Random Lake Gateway Spring Brook Beaver Dam East East Campus Rio 4 Y X- D O D G E Beaver Dam 7 Rio Pumping Station Mayville Walnut GIS Kewaskum Shorewood Hills Random Lake Auburn Pleasant View Mayville Mendota Ruskin Blackhawk (MGE) Baraboo 4 Kekoskee 6 Y-5 9 Island 46 Wyocena SW STR X Sycamore SW YD 8 Middleton North Beaver Dam Y-65 L- CO L Creek SW STR S A U K Wyocena Manley Sand Loganville 54 Soldiers Grove Moore Skillet St Randolph W- 5 Y- 8 North Freedom Loganville 8 Island Kirkwood Tap Pardeeville Columbia SW YD (ALTE) Baraboo 6 Didion SW STR ACEC Cambria SW STR Sanborn Randolph Tap X- Rock Rock Springs Springs Readstown De Soto Lake Delton SW STR 44 Y- Lime Ridge X Y- X Pardeeville 0 X- Rock Springs SW STR Cambria Pardeeville SW STR Fox Lake 7 X-4 Maple Bluff Y- Pheasant G-Branch BT B5 Holland 86 X Y 6 Artesian 80 5 Portage X-6 North Randolph S H E B O Y G A N X-5 ACEC Friesland X-6 X-6 X- Reedsburg ACEC Cambria Portage Hamilton St Ind Trienda Park Hamilton St SW STR X- 9 Portage Y- 0 X-6 7 Zobel Reedsburg Cazenovia Friesland East Towne D A N E Campbellsport Ironton X- Reedsburg Nishan Butternut 84 Viroqua X-6 8 Brownsville 9 Adell Lakehead Portage 49 Westport Y-4 X-7 5 L A C 7 69 Birchwood Koch Oil SW STR Waupun D U B5 BT G- Loch Mirror X-7 Lakehead Portage Sw Str 9 X-6 8 F O N D Madison Area Forward Energy Center Y-5 Waupun Tap Lyndon American Cascade Huiskamp 54 7 V E R N O N Yuba Alto Alto SW STR Wisconsin Dells 0 YDell Creek X-7 8 La Valle 56 L A K E 44 Wonewoc Y-64 La Farge G R E E N ACEC Roslin SW STR Waldo 654 ACEC Roslin Y58 Hillsboro Endeavor A D A M S RUBG DPC Lyndon STA SW STR Wonewoc Hillsboro Westby J U N E A U Y- 0 Oakfield X-0 Union Center Y0 Endeavor Sw Str 9 X- Chaseburg Hillsboro Tap 00 Y- 6 Eden Kingston M A R Q U E T T E Y- 7 7 Union Center Twin Lakes (ALTE) Spring Valley (WE) Twin Lakes Katzenberg Park Ave Tap REC Shaw I L L I N O I S T r a n s m i s s i o n Electric Transmission and Related Facilities Transmission Facilities Substation or Switching Yard Tap or Switching Structure Transmission Line Voltage and Type 69 kv Underground < 50 kv 69 kv 69 kv Double Circuit 5 kv 5 kv Double Circuit 8 kv 8 kv Double Circuit 6 kv 6 kv Double Circuit 5 kv 0 kv 0 kv Double Circuit 6 kv 45 kv 45 kv Double Circuit Generation ATC Office Location Non-ATC 69 kv 8 kv Underground N e t w o r k a n d P L A N N I N G Y-5 East Rockton SW STR S u b s t a t i o n s Z O N E ZONE M I C H I G A N 88 kv W I S C O N S I N ZONE ZONE 4 Miles 45 kv Non-Op Underground Mixed voltage double circuit lines drawn with each line color corresponding to the appropriate voltage Airport, Airfield or Helicopter Landing Area Tap or Switching Structure G:\WORKSPACE\ArcMap Templates\ Maps\.mxd Modified: May 0, 00 Revised May ZONE ZONE 5 Currently, ATC owns or operates transmission facilities in 50 Wisconsin counties and in 5 Michigan counties. Facilities include: * Approximately 950 miles of transmission lines * 96 wholly owned substations * 40 jointly owned substations * ATC offices in Madison, Cottage Grove, Pewaukee, De Pere, Wausau and Kingsford, MI The information presented in this map document represent the most current and accurate georeferenced compilation of ATC owned and operated transmission facilities available - some facility locations may be approximate. This map is advisory and intended for reference purposes only. Please direct any revisions or corrections to ATC Asset Applications and GIS Group. Base Map Information: ATC, PSCW, MiDNR, WDNR