Top 100 Contractors in PSC S1: Utilities, FY2021

Name: Top 100 Contractors in PSC S1: Utilities, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 40% of FY2021 PSC S1 contract dollars

Contract obligations: $2,257,634,947 Net of deobligations, by contracts coded PSC S1 or a code under it
Contractors: 1,081 Parent companies with an obligation
Largest contractor: Foreign Utility Consolidated Reporting $170 million, 6.9% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$170,066,374	6.9%	Rank history: #2 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; up 2 since FY2020.
2	American Water Works Company Inc. 10 awardees, including American Water Operations and Maintenance, LLC, American Water Military Services, LLC and Pennsylvania - American Water Company Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$149,197,617	6.0%	Rank history: #1 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	Exelon Corporation 18 awardees, including Potomac Electric Power Co, Constellation Newenergy, Inc. and Constellation Newenergy - Gas Division, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) GSA (General Services Administration)	$148,208,076	6.0%	Rank history: #7 in FY2022, #4 in FY2023, #11 in FY2024 and not on the FY2025 list; up 4 since FY2020.
4	L3Harris Technologies, Inc. 2 awardees, including Harris Corporation and L3 Technologies, Inc. Top agencies DOT (Department of Transportation) DOJ (Department of Justice)	$138,423,517	5.6%	Rank history: #5 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; up 1 since FY2020.
5	Doyon Utilities LLC 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$94,242,709	3.8%	Rank history: #6 in FY2022, #7 in FY2023, #4 in FY2024 and #5 in FY2025; up 5 since FY2020.
6	Dominion Resources Inc. 12 awardees, including Virginia Electric and Power Company, Dominion Privatization Texas, LLC and Dominion Privatization South Carolina LLC Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) Smithsonian (Smithsonian Institution)	$68,940,134	2.8%	Rank history: #4 in FY2022, #5 in FY2023, #6 in FY2024 and #4 in FY2025; down 2 since FY2020.
7	Old North Utility Services Inc. 6 awardees, including Fort Bliss Water Services Company, Terrapin Utility Services, Inc. and Old Dominion Utility Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$63,498,523	2.6%	Rank history: #8 in FY2022, #8 in FY2023, #23 in FY2024 and not on the FY2025 list; up 10 since FY2020.
8	WGL Energy Services Inc. 5 awardees, including Washington Gas Light Company and Semco Energy, Inc. Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) SSA (Social Security Administration)	$54,034,655	2.2%	Rank history: #9 in FY2022, #6 in FY2023, #9 in FY2024 and #10 in FY2025; up 4 since FY2020.
9	Water Authority Busan Metropolitan City Korea 8 awardees, including Korea Electric Power Corporation, Daegu Metropolitan City and Headquarters of Pohang Waterworks Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$47,024,557	1.9%	Rank history: #14 in FY2022, #9 in FY2023, #12 in FY2024 and #19 in FY2025; up 2 since FY2020.
10	Keenan FT Detrick Energy LLC Top agencies Army (Department of the Army)	$42,642,762	1.7%	Rank history: #12 in FY2022, #18 in FY2023, #14 in FY2024 and #15 in FY2025; up 6 since FY2020.
11	SAN Diego Gas & Electric Company 3 awardees, including Southern California Gas Company Top agencies Navy (Department of the Navy) IBWC (International Boundary and Water Commission U.S.-Mexico) DOJ (Department of Justice)	$36,663,171	1.5%	Rank history: #42 in FY2022, #13 in FY2023, #52 in FY2024 and #30 in FY2025; down 2 since FY2020.
12	Centrica PLC 3 awardees, including NRG Business Marketing LLC and Direct Energy Business LLC Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$36,409,110	1.5%	Rank history: #70 in FY2022, #19 in FY2023, #16 in FY2024 and not on the FY2025 list; up 46 since FY2020.
13	PG&E Corporation Through Pacific Gas and Electric Company Top agencies DOI (Department of the Interior) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$30,444,880	1.2%	Rank history: #27 in FY2022, #25 in FY2023, #41 in FY2024 and #73 in FY2025; unchanged since FY2020.
14	Aqua Engineers Inc. Top agencies Army (Department of the Army)	$29,703,975	1.2%	Rank history: #19 in FY2022, #21 in FY2023, #21 in FY2024 and #23 in FY2025; up 5 since FY2020.
15	Georgia Power Company 9 awardees, including Alabama Power Company, Southern Company Gas and Mississippi Power Co Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$29,322,113	1.2%	Rank history: #10 in FY2022, #16 in FY2023, #15 in FY2024 and #13 in FY2025; up 5 since FY2020.
16	Nextera Energy Inc. 7 awardees, including Florida Power & Light Company, Gexa Energy, LP and Gulf Power Company Top agencies NASA (National Aeronautics and Space Administration) USDA (Department of Agriculture) DOJ (Department of Justice)	$26,535,303	1.1%	Rank history: #16 in FY2022, #12 in FY2023, #19 in FY2024 and #27 in FY2025; up 2 since FY2020.
17	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. and Black Warrior Electric Membership Corporation Top agencies DOT (Department of Transportation) Army (Department of the Army)	$26,196,977	1.1%	Rank history: #50 in FY2022, #27 in FY2023, #17 in FY2024 and #22 in FY2025; up 4 since FY2020.
18	RIO Grande Electric Cooperative, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$22,553,203	0.9%	Rank history: #31 in FY2022, #38 in FY2023, #31 in FY2024 and #37 in FY2025; up 30 since FY2020.
19	Philadelphia Authority for Industrial Development Top agencies Navy (Department of the Navy)	$21,120,031	0.9%	Rank history: not on the FY2022–FY2024 lists and #32 in FY2025; up 184 since FY2020.
20	City Light & Power Inc. Top agencies USAF (Department of the Air Force)	$20,527,042	0.8%	Rank history: #17 in FY2022, #32 in FY2023, #25 in FY2024 and not on the FY2025 list; up 95 since FY2020.
21	Firstenergy Corporation 9 awardees, including Monongahela Power Company, The Potomac Edison Co and The Cleveland Electric Illuminating Co Top agencies DOJ (Department of Justice) NASA (National Aeronautics and Space Administration) Treasury (Department of the Treasury)	$19,568,553	0.8%	Rank history: #26 in FY2022, #22 in FY2023, #37 in FY2024 and #44 in FY2025; up 56 since FY2020.
22	Sandhills Utility Services, LLC Top agencies Army (Department of the Army)	$19,022,657	0.8%	Rank history: #24 in FY2022, #23 in FY2023, #26 in FY2024 and #39 in FY2025; up 2 since FY2020.
23	National Grid PLC 6 awardees, including National Grid USA Service Company, Inc., Massachusetts Electric Co and National Grid Corporate Services LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Treasury (Department of the Treasury)	$18,504,977	0.7%	Rank history: #38 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
24	Municipality of Anchorage 3 awardees, including Chugach Electric Association, Inc. Top agencies USAF (Department of the Air Force)	$18,336,110	0.7%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
25	American Electric Power Company, Inc. 7 awardees, including AEP Energy Inc., Ohio Valley Electric Corporation and Public Service Company of Oklahoma Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DOE (Department of Energy)	$17,208,751	0.7%	Rank history: #20 in FY2022, #10 in FY2023, #13 in FY2024 and #84 in FY2025; up 1 since FY2020.
26	Jacobs Engineering Group Inc. Through Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$17,153,500	0.7%	Rank history: #32 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
27	City Light & Power Aberdeen, LLC Top agencies Army (Department of the Army)	$17,029,929	0.7%	Rank history: #22 in FY2022, #20 in FY2023, #60 in FY2024 and not on the FY2025 list; unchanged since FY2020.
28	Fort Riley Utility Services, Inc. Top agencies Army (Department of the Army)	$16,601,488	0.7%	Rank history: #30 in FY2022, #29 in FY2023, #22 in FY2024 and #41 in FY2025; up 13 since FY2020.
29	Sho-Me Power Electric Cooperative Top agencies Army (Department of the Army)	$16,518,709	0.7%	Rank history: #36 in FY2022, #40 in FY2023, #33 in FY2024 and #36 in FY2025; up 1 since FY2020.
30	Duke Energy Corporation 6 awardees, including Duke Energy Progress, LLC, Piedmont Natural Gas Company, Inc. and Duke Energy Ohio, Inc. Top agencies DOJ (Department of Justice) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$16,233,344	0.7%	Rank history: #11 in FY2022, #11 in FY2023, #24 in FY2024 and #24 in FY2025; down 28 since FY2020.
31	Entergy Corporation 3 awardees, including Entergy Louisiana, LLC and Entergy Arkansas, LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$16,131,422	0.7%	Rank history: #41 in FY2022, #17 in FY2023, #70 in FY2024 and not on the FY2025 list; unchanged since FY2020.
32	Emerald Coast Utility Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$15,706,337	0.6%	Rank history: #35 in FY2022, #34 in FY2023, #32 in FY2024 and #34 in FY2025; up 6 since FY2020.
33	Base Utilities Inc. Top agencies USAF (Department of the Air Force)	$15,250,054	0.6%	Rank history: #49 in FY2022, #47 in FY2023, #43 in FY2024 and #49 in FY2025; up 19 since FY2020.
34	New Mexico Gas Company Inc. 3 awardees, including Peoples Gas System, Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) HHS (Department of Health and Human Services)	$14,170,748	0.6%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
35	Florida Governmental Utility Authority Top agencies USAF (Department of the Air Force)	$13,758,633	0.6%	Rank history: #62 in FY2022, #75 in FY2023, #72 in FY2024 and not on the FY2025 list; up 70 since FY2020.
36	Korea Electric Power Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy)	$12,628,363	0.5%	Rank history: not on the FY2022–FY2024 lists and #14 in FY2025; down 3 since FY2020.
37	Centerpoint Energy, Inc. 8 awardees, including Centerpoint Energy Resources Corp., Vectren Energy Delivery of Ohio, LLC and Vectren LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DOJ (Department of Justice)	$12,506,937	0.5%	Rank history: #29 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
38	City Light & Power FTC LLC Top agencies Army (Department of the Army)	$12,007,986	0.5%	Rank history: #28 in FY2022, #45 in FY2023, #94 in FY2024 and not on the FY2025 list; up 18 since FY2020.
39	Augusta-Richmond County Government Top agencies Army (Department of the Army)	$11,996,167	0.5%	Rank history: #44 in FY2022, #64 in FY2023, #42 in FY2024 and #29 in FY2025; up 29 since FY2020.
40	OGE Energy Corp 2 awardees, including Oklahoma Gas and Electric Company Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) DOE (Department of Energy)	$11,850,214	0.5%	Rank history: #37 in FY2022, #36 in FY2023, #27 in FY2024 and #96 in FY2025; up 5 since FY2020.
41	Golden Valley Electric Association Inc. Top agencies Army (Department of the Army)	$11,521,555	0.5%	Rank history: #45 in FY2022, #48 in FY2023, #35 in FY2024 and #100 in FY2025; up 5 since FY2020.
42	Gulf Coast Electric Cooperative Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,396,941	0.5%	Rank history: #3 in FY2022, #49 in FY2023, #69 in FY2024 and #50 in FY2025; up 7 since FY2020.
43	City Light & Power Jblm LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$11,339,184	0.5%	Rank history: #52 in FY2022, #33 in FY2023, #81 in FY2024 and not on the FY2025 list; unchanged since FY2020.
44	Harris Corporation Top agencies DOT (Department of Transportation)	$11,216,588	0.5%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; down 38 since FY2020.
45	Consolidated Edison 2 awardees, including Consolidated Edison Company of New York, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Smithsonian (Smithsonian Institution)	$11,030,002	0.4%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 83 since FY2020.
46	Washington Suburban Sanitary Commission Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) Smithsonian (Smithsonian Institution)	$10,666,526	0.4%	Rank history: #40 in FY2022, #41 in FY2023, #34 in FY2024 and #35 in FY2025; down 17 since FY2020.
47	Government of the United States 5 awardees, including United States Department of the Air Force, Department of Energy and General Services Administration Greater Southwest Finance Center (7Bc) Top agencies DOJ (Department of Justice) Army (Department of the Army) Navy (Department of the Navy)	$10,543,569	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Choctawhatchee Electric Cooperative, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$10,493,294	0.4%	Rank history: #58 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
49	City Light & Power Awp, LLC Top agencies Army (Department of the Army)	$10,252,477	0.4%	Rank history: #48 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
50	Omega Pipeline Company, LLC Top agencies Army (Department of the Army)	$9,692,557	0.4%	Rank history: #59 in FY2022, #61 in FY2023, #68 in FY2024 and #60 in FY2025; up 37 since FY2020.
51	NRG Energy, Inc. 4 awardees, including Reliant Energy Northeast LLC, Direct Energy Business LLC and Reliant Energy Retail Services, LLC Top agencies GSA (General Services Administration) Treasury (Department of the Treasury) USAF (Department of the Air Force)	$9,263,995	0.4%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 38 since FY2020.
52	City Light & Power Ftr, LLC Top agencies Army (Department of the Army)	$8,955,338	0.4%	Rank history: #43 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
53	Navajo Nation Tribal Government 2 awardees, including Navajo Tribal Utility Authority Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$8,483,569	0.3%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 41 since FY2020.
54	Alaska Power & Telephone Company Top agencies DOI (Department of the Interior)	$8,116,733	0.3%	Rank history: not on the FY2022–FY2025 lists; up 302 since FY2020.
55	Tiger Natural Gas, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) NASA (National Aeronautics and Space Administration)	$7,964,295	0.3%	Rank history: #53 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 81 since FY2020.
56	Hardin County Water District NO. 1 Top agencies Army (Department of the Army)	$7,669,183	0.3%	Rank history: #69 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
57	City Public Services Board Top agencies USAF (Department of the Air Force)	$7,664,593	0.3%	Rank history: #65 in FY2022, #77 in FY2023, #57 in FY2024 and #72 in FY2025; up 6 since FY2020.
58	Harford County, Maryland Top agencies Army (Department of the Army)	$7,363,710	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Pural Water Specialty Co. , Inc. Top agencies Army (Department of the Army)	$7,062,849	0.3%	Rank history: #97 in FY2022, #66 in FY2023, #86 in FY2024 and #91 in FY2025; up 55 since FY2020.
60	Central Coast Water Authority Top agencies USAF (Department of the Air Force)	$6,890,542	0.3%	Rank history: #87 in FY2022, #67 in FY2023, #67 in FY2024 and #66 in FY2025; up 5 since FY2020.
61	Xcel Energy 4 awardees, including Southwestern Public Service Company, Public Service Company of Colorado and Northern States Power Company Top agencies DOI (Department of the Interior) Treasury (Department of the Treasury) DOJ (Department of Justice)	$6,733,756	0.3%	Rank history: #61 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; down 33 since FY2020.
62	Engie Resources LLC Top agencies GSA (General Services Administration) Army (Department of the Army) VA (Department of Veterans Affairs)	$6,414,438	0.3%	Rank history: #18 in FY2022, #50 in FY2023, #28 in FY2024 and #21 in FY2025; up 190 since FY2020.
63	Energetic SPA Top agencies Army (Department of the Army)	$6,244,209	0.3%	Rank history: #47 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; up 266 since FY2020.
64	City of Philadelphia 4 awardees, including City of Philadelphia Department of Revenue Water Revenue Bureau B0610658047, City of Philadelphia P and Philadelphia Water Department Top agencies DOI (Department of the Interior) Navy (Department of the Navy) Treasury (Department of the Treasury)	$6,220,988	0.3%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; up 120 since FY2020.
65	Centerpoint Energy Services Inc. Through Nextera Energy Services Gas, LLC Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice) USAF (Department of the Air Force)	$6,211,348	0.3%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	Ameresco Inc. 2 awardees, including Ameresco Select, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$5,950,712	0.2%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
67	Buyo Gas Co.,Ltd. 2 awardees, including Buyo Ekika Gas Co., Ltd. Top agencies USAF (Department of the Air Force)	$5,661,190	0.2%	Rank history: #39 in FY2022, #39 in FY2023, #44 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
68	Canoochee Electric Membership Corp Top agencies Army (Department of the Army)	$5,523,120	0.2%	Rank history: #78 in FY2022, #57 in FY2023, #46 in FY2024 and #46 in FY2025; up 1 since FY2020.
69	City of Aberdeen Top agencies Army (Department of the Army)	$5,436,271	0.2%	Rank history: #82 in FY2022, #74 in FY2023, #54 in FY2024 and #70 in FY2025; up 16 since FY2020.
70	Sage Energy Trading LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Treasury (Department of the Treasury)	$5,341,947	0.2%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
71	Kyungnam Energy Co. Ltd Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,203,392	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Hawaii Electric Light Company Inc. 2 awardees, including Hawaiian Electric Company, Inc. Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) Army (Department of the Army)	$5,081,613	0.2%	Rank history: #85 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
73	Flint Electric Membership Corp Top agencies Army (Department of the Army)	$5,062,229	0.2%	Rank history: #56 in FY2022, #70 in FY2023, #55 in FY2024 and #71 in FY2025; down 22 since FY2020.
74	County of Miami-Dade 2 awardees, including Miami-Dade Water & Sewer Dept and Dade County Aviation Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) Army (Department of the Army)	$5,035,719	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
75	Laclede Electric Cooperative Top agencies Army (Department of the Army)	$4,914,995	0.2%	Rank history: #81 in FY2022, #72 in FY2023, #90 in FY2024 and #83 in FY2025; down 4 since FY2020.
76	Dynegy Energy Services (EAST) LLC 3 awardees, including Illinois Power Marketing Company, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) GSA (General Services Administration)	$4,833,408	0.2%	Rank history: #55 in FY2022, #73 in FY2023, #75 in FY2024 and not on the FY2025 list; up 169 since FY2020.
77	Pyeongtaek-Si Water and Sewage Business Place Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,705,599	0.2%	Rank history: not on the FY2022–FY2024 lists and #82 in FY2025; up 25 since FY2020.
78	CFE Distribucion, E.p.s. Top agencies DOS (Department of State)	$4,593,902	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	City of Memphis Through Memphis Light Gas & Water Top agencies Treasury (Department of the Treasury) DOJ (Department of Justice)	$4,489,535	0.2%	Rank history: #90 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
80	Nolin Rural Electric Cooperative Corporation Top agencies Army (Department of the Army)	$4,385,505	0.2%	Rank history: #46 in FY2022, #43 in FY2023, #47 in FY2024 and #56 in FY2025; down 45 since FY2020.
81	TXU Energy Retail Company LLC Top agencies USAF (Department of the Air Force)	$4,354,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	American Water Enterprises, LLC Top agencies Army (Department of the Army)	$4,328,396	0.2%	Rank history: #66 in FY2022, #44 in FY2023, #63 in FY2024 and #54 in FY2025; unchanged since FY2020.
83	Hydrogenics Corporation 3 awardees, including Liberty Utilities (Peach State Natural Gas) Corp., Liberty Utilities (Energynorth Natural Gas) Corp. and The Empire District Electric Company Top agencies Army (Department of the Army) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$4,284,320	0.2%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
84	Riverbend Water Resources District Top agencies Army (Department of the Army)	$4,178,966	0.2%	Rank history: #84 in FY2022, #76 in FY2023, #66 in FY2024 and #55 in FY2025; up 20 since FY2020.
85	Enspire Energy, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$4,129,845	0.2%	Rank history: #88 in FY2022, #93 in FY2023, #83 in FY2024 and #93 in FY2025; up 121 since FY2020.
86	RTX Corporation Through Noresco, LLC Top agencies DOJ (Department of Justice) DOT (Department of Transportation)	$4,124,289	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
87	Griffiss Utility Services Corporation Top agencies USAF (Department of the Air Force)	$4,082,958	0.2%	Rank history: not on the FY2022 list, #94 in FY2023 and not on the FY2024–FY2025 lists; up 61 since FY2020.
88	Johnson Controls Security Solutions LLC 2 awardees, including Johnson Controls Government Systems, LLC and Johnson Controls, K.K. Top agencies DOE (Department of Energy) Navy (Department of the Navy) USAF (Department of the Air Force)	$4,077,211	0.2%	Rank history: not on the FY2022–FY2025 lists; up 263 since FY2020.
89	Vandenberg Solar I, LLC Top agencies USAF (Department of the Air Force)	$4,025,697	0.2%	Rank history: #96 in FY2022, #100 in FY2023, #95 in FY2024 and #97 in FY2025; up 23 since FY2020.
90	Edison International 2 awardees, including Southern California Edison Company Top agencies DOJ (Department of Justice) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$3,924,589	0.2%	Rank history: not on the FY2022 list, #69 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
91	Cleco Corporation 2 awardees, including Cleco Power LLC Top agencies DOJ (Department of Justice)	$3,905,817	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 175 since FY2020.
92	City of Atlanta 2 awardees, including City of Atlanta Department of Aviation Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) NARA (National Archives and Records Administration)	$3,864,522	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
93	City of Terre Haute Top agencies DOJ (Department of Justice)	$3,860,506	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	The AES Corporation 2 awardees, including The Dayton Power and Light Company and Indianapolis Power & Light Co Top agencies USAF (Department of the Air Force) DECA (Defense Commissary Agency)	$3,787,801	0.2%	Rank history: #79 in FY2022, #68 in FY2023, #79 in FY2024 and #48 in FY2025; up 46 since FY2020.
95	Northeast Utilities 4 awardees, including Eversource Energy Service Company and Nstar Electric Company Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) DOT (Department of Transportation)	$3,768,724	0.2%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 29 since FY2020.
96	UEI MNLKXA3LT931 Top agencies Army (Department of the Army)	$3,679,108	0.1%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
97	Verendrye Electric Cooperative Inc. Top agencies USAF (Department of the Air Force)	$3,661,200	0.1%	Rank history: not on the FY2022 list, #97 in FY2023, #78 in FY2024 and #74 in FY2025; up 33 since FY2020.
98	Detroit Thermal, LLC Top agencies GSA (General Services Administration)	$3,631,292	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Evergy, Inc. 3 awardees, including Evergy Kansas Central Inc., Evergy Metro, Inc. and Evergy Missouri West, Inc. Top agencies NARA (National Archives and Records Administration) DOJ (Department of Justice) DOI (Department of the Interior)	$3,541,087	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 306 since FY2020.
100	LOS Angeles Department of Water and Power Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs)	$3,474,990	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 1,081 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC S1

Code	Net obligations	Largest contractor
S112 Electric Services	$1,058,882,211	Exelon Corporation
S114 Water Services	$490,945,573	American Water Works Company Inc.
S119 Other Utilities	$352,039,703	Foreign Utility Consolidated Reporting
S111 Gas Services	$179,711,263	WGL Energy Services Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $2.47 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC S1 contractors in FY2021?

1. Foreign Utility Consolidated Reporting ($170M), 2. American Water Works Company Inc. ($149M), 3. Exelon Corporation ($148M), 4. L3Harris Technologies, Inc. ($138M), 5. Doyon Utilities LLC ($94.2M), 6. Dominion Resources Inc. ($68.9M), 7. Old North Utility Services Inc. ($63.5M), 8. WGL Energy Services Inc. ($54M), 9. Water Authority Busan Metropolitan City Korea ($47M), 10. Keenan FT Detrick Energy LLC ($42.6M).

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