Rocky Mountain Power Five Year Study Findings & Kick Off Meeting

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1 2000 PACIFICORP PAGE 1 Attachment K Rocky Mountain Power Five Year Study Findings & Kick Off Meeting Thursday, June 9 th 2016

2 2000 PACIFICORP PAGE 2 Rocky Mountain Power Area Transmission Planning Manager: Ken Shortt Area Transmission Engineering: Mark Adams Talmage Daley Jeremy Viula Nathan Wilson Nicole DeGiulio Carlton Jones Scott Murdock Sachith Abayakoon

3 2000 PACIFICORP PAGE 3 Study Areas for 2016 Findings Reports Honeyville/Malad Montpelier Utah Valley, Utah Kickoff Studies Smithfield/Preston & Sigurd, Utah Price, Utah Southern Wyoming &Vernal, Utah Scott Murdock Carlton Jones Nicole DeGiulio Carlton Jones Nicole DeGiulio Scott Murdock

4 2000 PACIFICORP PAGE 4 HONEYVILLE/MALAD STUDY FINDINGS AREA ENGINEER ~ MARK ADAMS Completed by Scott Murdock

5 2000 PACIFICORP PAGE 5 Honeyville/Malad Study Area Area boundaries: North: Malad City East: Cache National Forest West: West side Great Salt Lake South: Brigham City Ben Lomond is outside of the area, but a main source

6 2000 PACIFICORP PAGE 6 Study Service Area Urban & agricultural areas: Service to portions of Box Elder & Cache counties in Utah & Oneida county in Idaho Larger communities served are: Tremonton, Malad City & Brigham City Largest population center is Brigham City

7 2000 PACIFICORP PAGE 7 Honeyville/Malad Study Info One municipality in the study area Four transmission substations at 138 kv 16 distribution substations 11 transmission customers Transmission voltages: 138, 69 & 46 kv Distribution voltages: & 4.16 kv

8 2000 PACIFICORP PAGE 8 MALAD AREA OF SERVICE: Mainly agricultural Service to Oneida & Box Elder counties Communities: o o o Snowville Malad City Holbrook Voltages: 138 kv, 69 & kv Substations: o o o one transmission three distribution one customer owned

9 2000 PACIFICORP PAGE 9 WHEELON/CUTLER AREA OF SERVICE: Mainly agricultural & industrial Service to portions of Oneida, Box Elder & Cache counties in Utah Communities: o Fielding, Plymouth, Newton, Wheelon, Riverside, Collinston, Garland, Bothwell, Thatcher, Deweyville, Elwood, & Tremonton Voltages: 138, 46 & kv Substations: o one transmission o eight distribution o three customer owned

10 2000 PACIFICORP PAGE 10 HONEYVILLE AREA SUBSTATIONS Mainly agricultural Service to Box Elder county Communities: o o o Honeyville Corrine Bear River Voltages: 138, 46 & kv Substations: o o o one transmission six distribution two customer owned

11 2000 PACIFICORP PAGE 11 LAMPO AREA LOADS All industrial loads Service in Box Elder county Voltages: 138 & 46 kv Substations: o o one transmission three customer owned

12 2000 PACIFICORP PAGE 12 Total Area Load Growth Base System Loads o o Growth o Summer 2015: 276 MVA (76% industrial) Winter : 220 MVA Summer: 1.1% (includes industrial) o Winter: 1.0% Projected System Loads o o Summer 2020: 310 MVA (includes industrial) Winter : 254 MVA

13 2000 PACIFICORP PAGE 13 Area Generation MW hydro units, 37.5 MW, owned by PacifiCorp. Average combined daily output is 16 MW. Several small third party river hydro s east of Brigham City near Mantua.

14 2000 PACIFICORP PAGE 14 Area Distribution Capacity The area is sectionalized into four operating areas: Malad-19.2 MVA Honeyville-35 MVA, Transmission substations: Cutler-56 MVA Lampo-75 MVA Distribution substations: (4) kv transformers MVA (1) kv transformer 14.0 MVA (2) kv transformers 13.4 MVA (15) kv transformers 65.0 MVA Total Distribution capacity is 205 MVA* *rounded up

15 Malad Bank #2 Increase Capacity 2000 PACIFICORP PAGE 15

16 2000 PACIFICORP PAGE 16 Move existing tap (3) to tap (4) in order to boost the voltage at Bear River & Blue Creek. e A load transfer on the distribution system is also required from Bush to Gold Rush; which will be done under the direction of field engineering.

17 Substation equipment bus fault-duty is within guidelines PACIFICORP PAGE 17

18 During peak summer loading most any of the N-1 conditions may require load shedding PACIFICORP PAGE 18

19 2000 PACIFICORP PAGE 19 Construction Schedule Summary Construction Schedule Summary 2016 CONSTRUCTION Set voltage recording meters at Blue Creek to verify high side voltage. Verify the jumpers on the Bear River tap line are equal to or greater than the line capacity. O/M O/M Subtotal $ CONSTRUCTION Malad Bank #2 Increase Capacity. $1,960,000 Subtotal $1,960, CONSTRUCTION No construction proposed for this year CONSTRUCTION Change No-Load Taps at Honeyville, move load from Bush to Gold Rush. N/A Subtotal $0 O/M Subtotal $ CONSTRUCTION No construction proposed for this year. Subtotal $0 Grand Total $1,960,000

20 2000 PACIFICORP PAGE 20 Honeyville/Malad Study Any questions or comments?

21 2000 PACIFICORP PAGE 21 MONTPELIER STUDY FINDINGS AREA ENGINEER - MARK ADAMS Completed by Carlton Jones

22 2000 PACIFICORP PAGE 22 Montpelier Study Area Ovid & Montpelier in north 69 kv loop around Mud Lake Intersection of three state borders Naughton in south 46 kv system from Sage

23 2000 PACIFICORP PAGE 23 Montpelier Study Info Five residential load centers: Montpelier, Cokeville, Garden City, St. Charles, & Bear River Remaining substations are agricultural Four transmission substations: Ovid, Sage, Naughton* & Oneida* Transmission Voltages:138, 69, & 46 kv Distribution Voltages: 12.47, 7.2, & 2.4 kv No appreciable generation Substation equipment bus fault duty: within guidelines No transmission capacitors *Naughton & Oneida are outside this study, but are sources for the area.

24 2000 PACIFICORP PAGE kv System Ovid kv to Naughton kv Ovid kv Serves Rich, Montpelier & Bear Lake areas Substations: o three transmission o eleven distribution Sage kv Naughton kv

25 2000 PACIFICORP PAGE kv System North & south from Sage service to Cokeville, Randolph, Woodruff Can be backfed by installing kv mobile at Railroad Substations: o One transmission o Five distribution

26 2000 PACIFICORP PAGE 26 Load & Growth Base System Loads o o Summer 2016: 33.4 MVA Winter : 23.8 MVA Growth o Summer: 2.3% o Winter: 1.2% Projected System Loads o o Summer 2020: 38.2 MVA Winter : 25.3 MVA Distribution Capacity: 65 MVA (Summer)

27 2000 PACIFICORP PAGE 27 N-0 System Improvements ( ) The Garden City area is prone to low voltages. Switching Lifton s feed to the Ovid-Naughton 69 kv line solves the low voltage problem. A tap change at Sage reduces the likelihood of low voltages on the Sage 46 kv system that may be increased by the above Lifton change. Regulators at St. Charles are undersized. They need to be replaced with kva units.

28 2000 PACIFICORP PAGE 28 N-1 System Improvements Outages involving Naughton & Ovid sources are difficult to mitigate & may require dropping load. The line between Ovid & Sage can only be opened with circuit breakers. Installing two loop-opening switches, i.e. with bottles, one on either side of Indian Creek tap will help reduce switching outages. Note: Unplanned transmission outages are uncommon in the area.

29 2000 PACIFICORP PAGE 29 Construction Schedule Summary Construction Schedule Summary 2016 Construction Move Lifton's source to Ovid-Sage line. Change Sage O&M no-load tap to #3 from #1 prior to transfer St. Charles ~ Increase capacity: Replace existing $ 260,000 regulators with 250 kva units 2017 Construction New 69kV LO/LD switch between Lifton & Indian Creek $ 62, Construction No work required 2019 Construction No work required 2020 Construction No work required Total: $ 322,000

30 2000 PACIFICORP PAGE 30 Montpelier Study Any questions or comments?

31 2000 PACIFICORP PAGE 31 Utah Valley Study Prepared by: Nicole DeGiulio Area Planner: Nathan Wilson

32 2000 PACIFICORP PAGE 32 System Overview 1 3 Primary Sources kv lines from Salt Lake Valley 2. Spanish Fork kv 3. Lake Side Generation 4. Payson Generation (UAMPS) 4 2

33 2000 PACIFICORP PAGE 33 Load Growth Base System Loads o Summer 2015: 1011 MW (Industrial 47%) o Winter : 617 MW Growth: o Average Summer Percentage 3.2% o Average Winter Percentage 3.6% Projected System Loads o o Summer 2020: 1232 MW Winter : 816 MW Distribution capacity 681 MVA

34 2000 PACIFICORP PAGE 34 N-0 Conditions Vineyard Upgrade, 2017 Vineyard XFMR at 112% (22.4 MVA Rating) This is an approved project Convert substation to 138kV & Install a 30 MVA LTC transformer at Vineyard substation. Estimated cost: $7.6 Million

35 2000 PACIFICORP PAGE 35 N-0 Conditions Pelican Point Low Voltage, 2018 Pelican Point has low voltage This is an approved project. Move Pelican Point on to distribution circuit, Saratoga 17 Estimated cost: $675k

36 2000 PACIFICORP PAGE 36 N-0 Conditions Willow Ridge Transformer, 2018 Willow Ridge XFMR at 104% (14 MVA Rating) This is an approved project. Increase Capacity ~ Install a 22.4 MVA transformer with LTC Estimated cost: $750k

37 2000 PACIFICORP PAGE 37 N-0 Conditions Benjamin Transformer, 2019 Benjamin 2.5 MVA XFMR at 109% This is an approved project. Install a 3.75 MVA transformer. The existing single phase regulators will also need to changed to match the new transformer rating. Estimated cost: $500k

38 2000 PACIFICORP PAGE 38 N-0 Conditions Mapleton Transformer, MVA transformer at 106% This is an approved project. Install a 22.4 MVA transformer with LTC. Estimated cost: $1.4m

39 2000 PACIFICORP PAGE 39 N-0 Conditions Lehi Carter Conversion, 2019 Accommodate a Lehi City Carter substation conversion to 138 kv. It is required to rebuild 2.1 miles of 46 kv line to 138 kv, from Carter to Bull River, tying into the existing 138 kv system. This is an approved project. Use 1272 ACSR conductor. Estimated cost: $1.7m

40 2000 PACIFICORP PAGE 40 N-0 Conditions American Fork Transformer, 2020 Existing transformer has a 28.3 MVA rating loaded to 106% Install a second 30 MVA transformer with LTC. Estimated cost: $5.8m

41 2000 PACIFICORP PAGE 41 Total Construction Costs Construction Item 2017 CONSTRUCTION Cost Vineyard ~ Increase capacity $7.6m Subtotal $7.6m 2018 CONSTRUCTION Pelican Point ~ Remove substation & move load to distribution $675k Willow Ridge ~ Increase capacity. Install a kv transformer $750k Subtotal $1.425m 2019 CONSTRUCTION Benjamin ~ Increase capacity. Install a kv transformer $500k Mapleton ~ Increase capacity. Install a kv transformer $1.4m Lehi #3 ~ Convert to 138 kv & rebuild 46 kv line $1.7m Subtotal $3.6m 2020 CONSTRUCTION American Fork ~ Increase capacity. Install a second kv transformer $5.8m Subtotal $5.8m TOTAL COST $18.425m

42 Any questions or comments? 2000 PACIFICORP PAGE 42

43 2000 PACIFICORP PAGE 43 Study Areas for 2016 Kickoff Studies Smithfield/Preston & Sigurd, Utah Carlton Jones Price, Utah Nicole DeGiulio Southern Wyoming & Vernal, Utah Scott Murdock

44 2000 PACIFICORP PAGE 44 Carlton Jones/Mark Adams SMITHFIELD/PRESTON AREA STUDY

45 2000 PACIFICORP PAGE 45 Smithfield/Preston Study Service Area Downey in the North Dividing line to the East is the Cache Nation Forest Wheelon & Treasureton are the main sources for the area

46 2000 PACIFICORP PAGE 46 Smithfield/Preston Study Service Area Transmission Voltages are 230,138, & 46 kv Transmission substations: o Treasureton o Oneida o Franklin o Green Canyon kv kv (generation) kv kv o Smithfield kv Thirteen distribution substations, & 25 kv Municipalities: Logan City & Hyrum City Four transmission customers Area generation < 50 MW of natural gas & hydro

47 2000 PACIFICORP PAGE 47 Smithfield/Preston Study Any questions or comments?

48 2000 PACIFICORP PAGE 48 Carlton Jones/Nathan Wilson SIGURD UTAH AREA STUDY

49 2000 PACIFICORP PAGE 49 Sigurd Utah Study Includes portions of Sanpete, Sevier, Beaver, Garfield, Piute & Millard counties Some of the larger cities served include Gunnison, Beaver, Richfield, Panguitch, & Milford

50 2000 PACIFICORP PAGE 50 Sigurd Utah Study There are approximately 32 substations in the area Transmission voltages served are 230, 138, 69 & 46 kv Other entities within the area include Garkane Energy & Beaver City Municipal Electric

51 2000 PACIFICORP PAGE 51 Sigurd Utah Study Generation in the area is Blundell Geothermal Plant & Upper Beaver Hydro Plant.

52 2000 PACIFICORP PAGE 52 Sigurd Utah Study Any questions or comments?

53 2000 PACIFICORP PAGE 53 Nicole DeGiulio/Nathan Wilson PRICE AREA STUDY

54 2000 PACIFICORP PAGE 54 Price Study Soldier Summit in the north Emery city in southwest Green River in southeast I-70 defines the southern boundary

55 2000 PACIFICORP PAGE 55 Price Study Info Covers 5,200 square miles in Emery, Carbon & surrounding counties Two municipalities: Price city & Helper city Main source for the area is three local generation plants Approximately 60 substations, 31 are customer owned Transmission voltages 46, 69, 138 & 345 kv Study will concentrate mainly on the 138 kv system & below

56 2000 PACIFICORP PAGE 56 Price Study Any questions or comments?

57 2000 PACIFICORP PAGE 57 Scott Murdock/Talmage Daley SOUTHERN WYOMING STUDY

58 2000 PACIFICORP PAGE 58 Southern Wyoming Study The southern Wyoming study serves portions of Sweetwater, Carbon, & Albany counties. Major cities served include: Green River, Rock Springs, Sinclair & Laramie.

59 2000 PACIFICORP PAGE 59 Southern Wyoming Study Covers approximately 14,000 square miles of area There are approximately 32 substations in the area Transmission voltages: 345, 230, 115 & 57 kv Majority of investigative work will be 230 kv & below Area has several municipalities including WAPA & AMOCCO

60 2000 PACIFICORP PAGE 60 Southern Wyoming Study Main sources of generation are Flaming Gorge Dam in Utah, Jim Bridger thermal plant & Foote Creek Rim wind plant in Wyoming.

61 2000 PACIFICORP PAGE 61 Southern Wyoming Study Any Questions or Comments?

62 2000 PACIFICORP PAGE 62 Scott Murdock/Nathan Wilson VERNAL UTAH AREA STUDY

63 2000 PACIFICORP PAGE 63 Vernal Study Town of Hanna in west Town of Vernal in east Bonanza Power Plant (Deseret) It is approximately 53 miles northwest of Helper, Utah

64 2000 PACIFICORP PAGE 64 Vernal Study Info About 1,700 sq miles of territory located in Duchesne & Uintah counties Major communities served are Vernal & Maeser There are 11 substations, four are customer owned Transmission voltages include 345,138, & 69 kv

65 2000 PACIFICORP PAGE 65 Vernal Area Generation Generation from Flaming Gorge also contributes to the area Bonanza, owned by Deseret Generation & Transmission (DG&T), is the only generation within the study area

66 2000 PACIFICORP PAGE 66 Vernal Study Any Questions or Comments?

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