July 24, Project IR

Transcription

1 July 24, 2017 Project IR Maria Pope Manager, Facilities Operation and Maintenance John Wayne Airport, Orange County 3160 Airway Avenue Costa Mesa, California Re: Central Utility Plant Operating Cost Analysis Dear Ms. Pope: Amec Foster Wheeler Environment & Infrastructure, Inc. (Amec Foster Wheeler) performed an analysis to compare estimated costs associated with two scenarios for supplying electricity and air conditioning to Landside facilities (terminals and parking structures) at John Wayne Airport (JWA). This analysis was authorized by JWA under Task Order 4J-01 dated September 23, The following sections of this letter summarize the objective, background, basis, and results of the analysis. OBJECTIVE Currently, most of the electricity and air conditioning used in JWA Landside facilities and operations are supplied by the JWA Central Utility Plant (). If the were not in operation (e.g., permanently shut down), all electricity would have to be purchased from a public utility (Southern California Edison [SCE]), and JWA would need to maintain and operate an air conditioning plant powered by purchased electricity. The objective of this analysis was to compare the costs associated with continued operation of the with costs associated with providing electricity and air conditioning to Landside facilities by obtaining electricity from SCE. The analysis entailed a review of current (2016) electricity generation and air conditioning costs, and a comparison of those costs with the estimated costs that would be incurred for electricity and air conditioning if the were not in operation. BACKGROUND JWA began operation of the in The produces chilled water (used for air conditioning of the terminals) and generates electricity for the terminal buildings and parking structures. Without the, all electricity would have to be obtained from SCE, and JWA would have to maintain and operate the electric chillers in the to produce air conditioning for the terminals. The has been in operation for over six years. During this time, operations and cost data have been collected and operations have been optimized to produce more reliable and efficient electricity and air conditioning. In accordance with the current Interconnect Agreement between JWA and SCE (required by Public Utilities Commission Rules), JWA must import a minimum amount of electricity (at least 200 kilowatts) at all times. The Interconnect Agreement Amec Foster Wheeler Environment & Infrastructure, Inc. 121 Innovation Drive, Suite 200 Irvine, CA USA Tel (949) Fax (949) Page 1 of 15

2 Maria Pope John Wayne Airport July 24, 2017 Page 2 establishes the electricity import rate structure, which is classified as a Time-Of-Use (TOU) Schedule 8-B-S (Standby, Option B). During the winter months (October through May) the (along with the mandatory 200 kw import) can supply all electrical needs of the airport. However, during the summer months, the airport s electricity and air condition demands are greater and the cannot supply all of the electricity needed. Therefore, during the summer months some additional electricity (above the mandatory 200 kw) is purchased from SCE. The relies mainly on the use of lithium bromide absorption chillers to supply chilled water for airport air conditioning needs. The absorption chillers produce chilled water by recovery of waste heat from the generation of electricity. Thereby, air conditioning is produced using recovered heat, rather than by use of electricity. However, if the electric generators were shut down, terminal air conditioning would have to be supplied fully by the electrical chillers (which rely completely on electricity). If the were shut down, all of JWA s electricity would be supplied by SCE. Because there would no longer be an Interconnect Agreement with SCE (Interconnect Agreement is only allowed with self-generating electric facilities), JWA would import all electricity under a TOU-8 Critical Peak Pricing (CPP) commercial rate schedule, rather than a TOU-8-B-S rate schedule. COST ANALYSIS BASIS An analysis was performed to compare the costs of continuing to operate the with the costs of shutting down the electricity generation portion of the, continuing to operate the electric chillers and cooling tower, and obtaining all required electricity from SCE. Key factors that would result in cost differences between the two scenarios are listed below in Table 1. TABLE 1 Key Factors Accounting for Cost Differences Factor SCE Electricity Import Rate TOU-8-S (Option B) TOU-8-CPP Schedule Electricity Import Amount Air Conditioning Production Import 200 kilowatts at all times (minimum), sometimes higher in summer months Lithium Bromide Adsorption Chillers using heat recovery (mainly), electric chillers as needed Fuel (Natural Gas) Usage High None Operator Requirements Full time Part time Equipment Maintenance High Low SCE Departing Load Charge Yes None Import all electricity required by the airport Landside facilities and operations Electric Chillers (always); no lithium bromide adsorption chillers P:\164420\Docs\ Cost Analysis\July 24, 2017\Central Utility Plant Operating Cost Analysis.docx Page 2 of 15

3 Maria Pope John Wayne Airport July 24, 2017 Page 3 COST ANALYSIS RESULTS Electricity costs associated with both scenarios are broken down into two seasons: summer and winter. Summer rates (consisting of the four months of June-September) for electricity are significantly higher than winter rates (consisting of the eight months of October-May) under both SCE rate schedules. The cost analysis indicates that continued operation of the would be much less expensive than operation of the electric chillers and cooling tower (no ) in the summer months. This is due to the higher SCE electricity rates in the summer. It also indicates that continued operation of the would be less expensive than purchasing electricity in the winter months (all months other than the summer months), although not to the same extent as in the summer months. Table 2 below summarizes estimated costs associated with the two scenarios. Costs associated with the scenario are based upon actual data from year 2016 (as provided in Appendix A), with the exception of the major overhaul costs. Major overhaul costs are estimated based upon the past and predicted costs to maintain the for the life of the plant, as a yearly average. Costs associated with the no scenario are based upon estimated electricity use rates and their associated rate schedule, and estimated labor, parts, and maintenance costs to maintain the chillers and cooling towers (including both JWA labor and contractor labor). No other factors, such as those that may be associated with inflation, property taxes, insurance, etc., have been included in the cost estimates. TABLE 2 Annual Operating Costs versus Item Electricity $1,846,405 1 $6,761,652 Operators $1,666,710 1 $291,200 Fuel (Natural Gas) $835,253 1 $0 Major Overhauls (averaged over life of the plant) $400,000 $0 Chiller Plant and Cooling Tower Operation & Included in $125,000 Maintenance Operators Cost Annual Total $4,748,368 $7,177,852 Annual Difference $2,429,485 Note: 1 Costs are based upon actual billings or contracts for year P:\164420\Docs\ Cost Analysis\July 24, 2017\Central Utility Plant Operating Cost Analysis.docx Page 3 of 15

4 Maria Pope John Wayne Airport July 24, 2017 Page 4 CONCLUSION The annual estimated costs to continue operating the are significantly lower than the estimated costs associated with the shutdown the. The annual estimated cost saving for continued operation of the is $2,429,485. Amec Foster Wheeler appreciates this opportunity to provide services to JWA. Please contact Robert Romansik at (949) should you have any questions regarding this letter. Sincerely, Amec Foster Wheeler Environment & Infrastructure, Inc. Robert Romansik Principal - Chemical Duane Paul, P.G. Senior Associate Hydrogeologist Enclosure Appendix A: Supporting Data P:\164420\Docs\ Cost Analysis\July 24, 2017\Central Utility Plant Operating Cost Analysis.docx Page 4 of 15

5 APPENDIX A Supporting Data Page 5 of 15

6 Electric Import April-16 Total Electricity used (kwh) 1,785, , ,340 1,005, ,440 2,126,411 Reactive Usage (kvarh) 782, , , ,611 Maximum 4,928 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 1,888 1,044 1,064 2,108 On peak Mid peak Off peak Mid peak 264, ,016 1,005, ,440 2,126,411 Off peak 1,520,544 0 On peak Mid peak Off peak Mid peak 2,720 3,200 1,050 Off peak 4, Quantity Rate Cost SCE Import Quantity Rate Cost Demand - Facility Related 6,450 $18.34 $ 118, On peak $ Mid peak $ Off peak $ Mid peak 264,784 $ $4, ,391,195 $ $55, Off peak 1,520,544 $ $27, ,520,544 $ $35, bond charge (kwh) 1,785, $9, ,911, $21, Customer charge $ $ $ Power factor charge (kvar) 1,888 $ $ $ $2, Capacity reservation charge $56, energy credit (kwh) 1,785, $ On peak 0 $18.97 Mid peak 0 $3.58 On peak $ Mid peak $ Off peak $ Mid peak $12, ,391,195 $ $109, Off peak 1,520,544 $ $49, ,520,544 $ $55, s-backup on peak Mid peak Subtotal for billing month $ 161, Sate tax $ ,911, $1, Total monthly bill $161, SCE monthly bill $161, DEPARTING LOAD $38, Total monthly cost $200, $399, Cost Difference between vs $198, Page 6 of 15

7 May-16 Total Electricity used (kwh) 1,813, , , , ,532 1,888,526 Reactive Usage (kvarh) 803, , , ,171 Maximum 5,216 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 1, ,822 On peak Mid peak Off peak Mid peak 283, , , ,532 1,888,526 Off peak 1,530,624 0 On peak Mid peak Off peak Mid peak 4,288 3,200 1,050 Off peak 5,216 Demand - Facility Related 6,450 $ $ 95, On peak $ Mid peak $ Off peak $ Mid peak 283,136 $ $5, ,171,662 $ $50, Off peak 1,530,624 $ $27, ,530,624 $ $35, bond charge (kwh) 1,813, $9, ,702, $19, Customer charge $ $ $ Power factor charge (kvar) 1,888 $ $ $ $1, Capacity reservation charge $56, energy credit (kwh) 1,813, $ On peak 0 $ $122, Mid peak 0 $ 3.58 $18, On peak $ Mid peak $ Off peak $ Mid peak $13, ,171,662 $ $ 99, Off peak 1,530,624 $ $49, ,530,624 $ $55, s-backup on peak Mid peak Subtotal for billing month $162, Sate tax $ $ $ Total monthly bill $163, SCE monthly bill $163, DEPARTING LOAD $38, Total monthly cost of SCE $202, $500, Cost Difference between vs $297, Page 7 of 15

8 June-16 Total Electricity used (kwh) 807,456 2,567,707 1,079,086 4,516, ,060 7,202,334 Reactive Usage (kvarh) 639,832 2,034,663 3,578,950 5,613,613 Maximum 4,832 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 1,856 5,902 10,382 16,284 On peak 32, ,262 1,806, , ,451,919 Mid peak 60, ,904 1,806, , ,656, Off peak 320,296 1,026, , ,929,559 Mid peak 26,912 0 Off peak 366,672 0 On peak 896 4,800 1,650 Mid peak 1,728 4,800 1,650 Off peak 4,512 3,200 1,050 Mid peak 1,440 Off peak 4,832 Demand - Facility Related 6,450 $ $ 118, On peak 32,896 $ $ ,484,815 $ $58, Mid peak 60,680 $ $ ,717,241 $ $63, Off peak 320,296 $ $4, ,249,855 $ $52, Mid peak 26,912 $ $ ,912 $ $ Off peak 366,672 $ $6, ,672 $ $8, bond charge (kwh) 807, $4, , $4, Customer charge $ $ $ Power factor charge (kvar) 1,856 $ $ Power factor charge (kvar) 1,856 $ $ $ $9, Capacity reservation charge $59, energy credit (kwh) 807, $ On peak 6,450 $ $122, Mid peak 6,450 $ 3.58 $23, On peak 32,896 $ $2, ,484,815 $ $175, Mid peak 60,680 $ $2, ,717,241 $ $128, Off peak 320,296 $ $9, ,249,855 $ $71, Mid peak $1, ,912 $ $1, Off peak 366,672 $ $11, ,672 $ $13, s-backup on peak 896 $ $8, Mid peak 1,728 $ $2, Subtotal for billing month $116, Sate tax $ ,456 $ $ Total monthly bill $116, SCE monthly bill $116, DEPARTING LOAD $38, Total monthly cost of SCE $155, $851, Cost Difference between vs $696, Page 8 of 15

9 July-16 Total Electricity used/produced (kwh) 593,200 2,727,630 1,096,826 4,590, ,633 7,465,082 Reactive Usage (kvarh) 552,496 2,540,466 4,275,808 6,816,274 Maximum 3,232 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 1,440 6,621 11,144 17,766 On peak 44, ,775 1,836, , ,384,419 Mid peak 83, , ,836, , ,555, Off peak 464,808 1,635, , ,553,458 Mid peak 0 0 Off peak 0 0 On peak 1,504 4,800 1,650 Mid peak 1,824 4,800 1,650 Off peak 3,232 3,200 1,050 Mid peak 0 Off peak 0 Demand - Facility Related 6,450 $ $ 118, On peak 44,768 $ $ ,429,187 $ $56, Mid peak 83,624 $ $1, ,638,656 $ $61, Off peak 464,808 $ $7, ,018,266 $ $70, Mid peak 0 $ Off peak 0 $ bond charge (kwh) 593, $3, , $3, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 1,440 $ $ $ $10, Capacity reservation charge $59, energy credit (kwh) 593, $ On peak 6,450 $ $122, Mid peak 6,450 $ 3.58 $23, On peak 44,768 $ $2, ,429,187 $ $171, Mid peak 83,624 $ $3, ,638,656 $ $124, Off peak 464,808 $ $13, ,018,266 $ $95, Mid peak $ Off peak 0 $ $ s-backup on peak 1,504 $ $16, Mid peak 1,824 $ $3, Subtotal for billing month $112, Sate tax $ ,200 $ $ Total monthly bill $112, SCE monthly bill $112, DEPARTING LOAD $37, Total monthly cost of SCE $150, $859, Cost Difference between vs $708, Page 9 of 15

10 August-16 Total Electricity used (kwh) 296,720 2,736,722 1,014,545 1,036, ,406 3,950,157 Reactive Usage (kvarh) 96, , ,926 1,226,932 Maximum 2,208 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 928 8,559 3,240 11,799 On peak 33, , , , ,139,870 Mid peak 54, , , , ,317, Off peak 208,720 1,451, , ,658,366 Mid peak 0 0 Off peak 0 0 On peak 1,280 4,800 1,650 Mid peak 1,120 4,800 1,650 Off peak 2,208 3,200 1,050 Mid peak 0 Off peak 0 Demand - Facility Related 6,450 $ $ 118, On peak 33,096 $ $ ,172,966 $ $27, Mid peak 54,792 $ $ ,372,312 $ $32, Off peak 208,832 $ $3, ,867,198 $ $43, Mid peak 0 $ $ Off peak 0 $ $ bond charge (kwh) 296, $1, , $1, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 928 $ $ $ $7, Capacity reservation charge $59, energy credit (kwh) 296, $65.28 On peak 6,450 $ $122, Mid peak 6,450 $ 3.58 $23, On peak 33,096 $ $2, ,172,966 $ $82, Mid peak 54,792 $ $2, ,372,312 $ $64, Off peak 208,832 $ $5, ,867,198 $ $59, Mid peak $ Off peak 0 $ $ s-backup on peak 1,280 $ $13, Mid peak 1,120 $ $2, Subtotal for billing month $93, Sate tax $ ,720 $ $86.05 Total monthly bill $93, SCE monthly bill $93, DEPARTING LOAD $36, Total monthly cost of SCE $130, $582, Cost Difference between vs $452, Page 10 of 15

11 September-16 Total Electricity used (kwh) 282,616 2,515,847 1,264,976 5,294,619 64,009 7,874,476 Reactive Usage (kvarh) 95, ,245 1,791,451 2,642,695 Maximum 1,568 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 352 3,134 6,594 9,728 On peak 32, ,283 2,117, , ,649,135 Mid peak 50, , ,117, , ,133, Off peak 199,304 1,032,230 1,058, ,091,154 Mid peak 0 0 Off peak 0 0 On peak 1,376 4,800 1,650 Mid peak 992 4,800 1,650 Off peak 1,568 3,200 1,050 Mid peak Off peak Demand - Facility Related 6,450 $ $ 118, On peak 32,664 $ $ ,681,799 $ $62, Mid peak 50,648 $ $ ,184,130 $ $74, Off peak 199,304 $ $3, ,290,458 $ $53, Mid peak $ $ Off peak $ $ bond charge (kwh) 282, $1, , $1, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 352 $ $ $ $5, Capacity reservation charge $59, energy credit (kwh) 282, $62.18 On peak 6,450 $ $122, Mid peak 6,450 $ 3.58 $23, On peak 32,664 $ $2, ,681,799 $ $189, Mid peak 50,648 $ $2, ,184,130 $ $150, Off peak 199,304 $ $5, ,290,458 $ $72, Mid peak $ Off peak 0 $ $ s-backup on peak 1,376 $ $15, Mid peak 992 $ $1, Subtotal for billing month $92, Sate tax $ ,616 $ $81.96 Total monthly bill $92, SCE monthly bill $92, DEPARTING LOAD $37, Total monthly cost of SCE $130, $874, Cost Difference between vs $743, Peak total $ 2,949, Peak Average $ 737, Page 11 of 15

12 October-16 Total Electricity used (kwh) 409,776 1,836, ,000 3,252,172 97,327 5,185,930 Reactive Usage (kvarh) 59, , , ,848 Maximum 1,952 4,800 1,650 6,450 Standby 6,650 6,650 6,650 Reactive Demand (kvar) 288 1,291 2,286 3,576 On peak 5,856 Mid peak 9,952 Off peak 14,912 Mid peak 138,304 1,285,502 2,276,520 68,129 3,630,151 Off peak 240, , ,651 29,198 1,555,779 On peak 544 1,650 Mid peak 576 1,650 Off peak 864 1,050 Mid peak 1,952 Off peak 1,952 Demand - Facility Related 6,450 $ $ 118, On peak 5,856 $ $89.71 $ Mid peak 9,952 $ $ $ Off peak 14,912 $ $ $ Mid peak 138,304 $ $2, ,768,455 $ $88, Off peak 240,752 $ $3, ,796,531 $ $41, bond charge (kwh) 409, $2, ,039, $21, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 288 $ $ $ $2, Capacity reservation charge $59, energy credit (kwh) 409, $90.15 On peak $ Mid peak $ 3.58 On peak 5,856 $ $ $ Mid peak 9,952 $ $ $ Off peak 14,912 $ $ $ Mid peak $5, ,768,455 $ $172, Off peak 240,752 $ $7, ,796,531 $ $65, s-backup on peak 544 $ $ Mid peak 576 $ $ Subtotal for billing month $84, STate tax $ $ $1, Total monthly bill $84, SCE monthly bill $84, DEPARTING LOAD $30, Total monthly cost of SCE $115, $511, Cost Difference between vs $396, Page 12 of 15

13 November-16 Total Electricity used (kwh) 958,176 1,359, ,116 2,285,795 80,649 3,726,054 Reactive Usage (kvarh) 249, , , ,701 Maximum 4,512 4,800 1,650 6,450 Standby 4,233 6,650 6,650 Reactive Demand (kvar) 1,632 2,316 3,893 6,209 On peak Mid peak Off peak Mid peak 267, ,727 1,600,057 56,454 2,608,238 Off peak 690, , ,739 24,195 1,117,816 On peak 1,650 Mid peak 1,650 Off peak 1,050 Mid peak 267,392 1,650 Off peak 690,784 1,050 Demand - Facility Related 279 $ $5, ,450 $ $ 118, On peak $ $ Mid peak $ $ Off peak $ $ Mid peak 267,392 $ $4, ,875,630 $ $67, Off peak 690,784 $ $10, ,808,600 $ $42, bond charge (kwh) 958, $5, ,566, $19, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 1,632 $ $ $ $4, Capacity reservation charge $38, energy credit (kwh) 958, $ On peak $ Mid peak $ 3.58 On peak $ $ Mid peak $ $ Off peak $ $ Mid peak $10, ,875,630 $ $131, Off peak 690,784 $ $22, ,808,600 $ $65, s-backup on peak $ Mid peak $ Subtotal for billing month $97, STate tax $ $ $1, Total monthly bill $97, SCE monthly bill $97, DEPARTING LOAD $20, Total monthly cost of SCE $118, $450, Cost Difference between vs $331, Page 13 of 15

14 December-16 Total Electricity used (kwh) 1,525,648 1,046, ,510 1,245,243 6,912 2,298,656 Reactive Usage (kvarh) 698, , ,397 1,049,759 Maximum 4,736 4,800 1,650 6,450 Standby 4,233 6,650 6,650 Reactive Demand (kvar) 1,888 1,295 1,541 2,836 Electricity (kwh) On peak Mid peak KWH) (kwh) Mid peak 167, , ,670 4,838 1,609,059 Off peak 1,358, , ,573 2, ,597 Demand (kw) On peak 1,650 Mid peak 1,650 Off peak 1,050 (kw) Mid peak 267,392 Off peak 690,784 2,298,656 Demand - Facility Related 503 $18.00 $9, ,450 $ $ 118, On peak $ Mid peak $ Off peak $ Mid peak 167,544 $ $2, ,776,603 $ $41, Off peak 1,358,104 $ $21, ,047,701 $ $47, bond charge (kwh) 1,525, $8, ,134, $16, Customer charge $ $ $ Power factor charge (kvar) 0 $ Power factor charge (kvar) 1,888 $ $1, $ $2, Capacity reservation charge $38, energy credit (kwh) 1,525, $ Demand On peak 0 $ Mid peak 0 $ 3.58 On peak $ Mid peak $ Off peak $ Mid peak $6, ,776,603 $ $81, Off peak 1,358,104 $ $43, ,047,701 $ $74, s-backup on peak $ Mid peak $ Subtotal for billing month $131, STate tax $ $ $ Total monthly bill $131, SCE monthly bill $131, DEPARTING LOAD $30, Total month cost of SCE $162, $384, Cost Difference between vs $221, Page 14 of 15

15 Table 1 Electric Costs, versus Annual Operating Plant Type Winter - Electric Operating Costs 1,279,526 - Electric Operating Costs 3,593,444 Difference Annual Summer Total Annual $ $ 566,879 $ 1,846,405 $ $ 3,168,208 $ 6,761,652 $ 2,313,918 $ 2,601,329 $ 4,915,248 Table 2 Annual Costs Associated with versus Operating Plant Type Total Annual Electric Cost - One AC Mechanic - One Operator / Supervisor - Water Treatment - Chiller Extended Warranty - Contract Chiller Mechanics & Repairs - Contract Cooling Tower Mechanics & Repairs $ 1,846,405 $ 6,761,652 $166,400 $124,800 $20,000 $30,000 $25,000 $50,000 Annual Operator Contract Cost (includes all routine maintenance & equip.) Annual Major Overhauls (accrual) Cost Annual Fuel (natual gas) Cost Total $ 1,666,710 $ 400,000 $ 835,253 $ 4,748,368 $ 7,177,852 Annual Cost Saving for Operation $2,429,485 Page 15 of 15