Top 100 Contractors in PSC S111: Gas Services, FY2021

Name: Top 100 Contractors in PSC S111: Gas Services, FY2021
Creator: GovTribe

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

The top 10 won 51% of FY2021 PSC S111 contract dollars

Contract obligations: $179,711,263 Net of deobligations, by contracts coded PSC S111
Contractors: 141 Parent companies with an obligation
Largest contractor: WGL Energy Services Inc. $24.5 million, 11.7% 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	WGL Energy Services Inc. 5 awardees, including Semco Energy, Inc. and Washington Gas Light Company Top agencies USAF (Department of the Air Force) Smithsonian (Smithsonian Institution) Army (Department of the Army)	$24,515,908	11.7%	Rank history: #2 in FY2022, #1 in FY2023, #5 in FY2024 and #5 in FY2025; unchanged since FY2020.
2	Centrica PLC Through NRG Business Marketing LLC Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$21,050,359	10.1%	Rank history: #62 in FY2022, #7 in FY2023, #1 in FY2024 and not on the FY2025 list; up 20 since FY2020.
3	Exelon Corporation 8 awardees, including Constellation Newenergy - Gas Division, LLC, Baltimore Gas and Electric Company and Potomac Electric Power Co Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DOT (Department of Transportation)	$13,717,963	6.6%	Rank history: #15 in FY2022, #11 in FY2023, #22 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Omega Pipeline Company, LLC Top agencies Army (Department of the Army)	$9,692,557	4.6%	Rank history: #9 in FY2022, #9 in FY2023, #11 in FY2024 and #7 in FY2025; up 4 since FY2020.
5	Tiger Natural Gas, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) NASA (National Aeronautics and Space Administration)	$7,964,295	3.8%	Rank history: #8 in FY2022, #3 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
6	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$6,493,792	3.1%	Rank history: #7 in FY2022, #6 in FY2023, #6 in FY2024 and #3 in FY2025; up 3 since FY2020.
7	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)	$6,197,392	3.0%	Rank history: #11 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
8	Buyo Gas Co.,Ltd. 2 awardees, including Buyo Ekika Gas Co., Ltd. Top agencies USAF (Department of the Air Force)	$5,661,190	2.7%	Rank history: #5 in FY2022, #5 in FY2023, #4 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
9	Nextera Energy Inc. 3 awardees, including Florida Power & Light Company Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice)	$5,459,436	2.6%	Rank history: not on the FY2022 list, #48 in FY2023, #78 in FY2024 and not on the FY2025 list; up 34 since FY2020.
10	Sage Energy Trading LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Treasury (Department of the Treasury)	$5,341,947	2.6%	Rank history: #13 in FY2022, #13 in FY2023, #13 in FY2024 and #21 in FY2025; unchanged since FY2020.
11	Kyungnam Energy Co. Ltd Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,203,392	2.5%	Rank history: #98 in FY2022, not on the FY2023 list, #93 in FY2024 and not on the FY2025 list; up 134 since FY2020.
12	Georgia Power Company 6 awardees, including Southern Company Gas, Atlanta Gas Light Company and Southstar Energy Services LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$5,018,925	2.4%	Rank history: #18 in FY2022, #12 in FY2023, #12 in FY2024 and #14 in FY2025; up 12 since FY2020.
13	Enspire Energy, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$4,129,845	2.0%	Rank history: #21 in FY2022, #19 in FY2023, #16 in FY2024 and #18 in FY2025; up 12 since FY2020.
14	Hydrogenics Corporation 2 awardees, including Liberty Utilities (Peach State Natural Gas) Corp. and Liberty Utilities (Energynorth Natural Gas) Corp. Top agencies Army (Department of the Army) DOJ (Department of Justice)	$4,059,443	1.9%	Rank history: #19 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
15	One Gas Inc. 4 awardees Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOJ (Department of Justice)	$3,411,909	1.6%	Rank history: #16 in FY2022, #14 in FY2023, #10 in FY2024 and #13 in FY2025; down 3 since FY2020.
16	Centerpoint Energy, Inc. 6 awardees, including Centerpoint Energy Resources Corp., Vectren Energy Delivery of Ohio, LLC and Vectren LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$3,200,436	1.5%	Rank history: #17 in FY2022, #22 in FY2023, #34 in FY2024 and #85 in FY2025; down 12 since FY2020.
17	Samchully Co.,Ltd. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,662,180	1.3%	Rank history: #10 in FY2022, #8 in FY2023, #8 in FY2024 and #6 in FY2025; down 11 since FY2020.
18	Cobb Electric Membership Corporation Through Gas South, LLC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) DOJ (Department of Justice)	$2,646,069	1.3%	Rank history: #26 in FY2022, #10 in FY2023, #7 in FY2024 and #8 in FY2025; up 44 since FY2020.
19	Dominion Resources Inc. 7 awardees, including Dominion Energy South Carolina, Inc., Hope Gas, Inc. and Public Service Company of North Carolina, Incorporated Top agencies DOJ (Department of Justice) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$2,645,059	1.3%	Rank history: #22 in FY2022, #16 in FY2023, #18 in FY2024 and #34 in FY2025; up 2 since FY2020.
20	Hanjin Heavy Industries & Construction Holdings Co. Ltd. Through Daeryun E&S Co., Ltd. Top agencies Army (Department of the Army)	$2,007,438	1.0%	Rank history: #29 in FY2022, #31 in FY2023, #39 in FY2024 and #24 in FY2025; up 17 since FY2020.
21	Arapaho Communications. LP Top agencies DOJ (Department of Justice)	$1,992,335	1.0%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
22	SAN Diego Gas & Electric Company 2 awardees, including Southern California Gas Company Top agencies DOJ (Department of Justice) DOT (Department of Transportation) VA (Department of Veterans Affairs)	$1,887,298	0.9%	Rank history: #30 in FY2022, #32 in FY2023, #41 in FY2024 and #45 in FY2025; up 26 since FY2020.
23	City of Philadelphia Top agencies Navy (Department of the Navy) Treasury (Department of the Treasury) NARA (National Archives and Records Administration)	$1,860,923	0.9%	Rank history: #4 in FY2022, #44 in FY2023, #50 in FY2024 and #49 in FY2025; up 6 since FY2020.
24	A.i.m. Energy S.R.L. Top agencies Army (Department of the Army)	$1,832,353	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Nisource Inc. 6 awardees, including Columbia Gas of Virginia, Inc., Columbia Gas of Pennsylvania Inc. and Columbia Gas of Kentucky, Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) Smithsonian (Smithsonian Institution)	$1,283,461	0.6%	Rank history: #31 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 141 since FY2020.
26	PS Energy Group, Inc. Top agencies DOJ (Department of Justice)	$1,266,544	0.6%	Rank history: #24 in FY2022, #29 in FY2023, #31 in FY2024 and #27 in FY2025; up 16 since FY2020.
27	UGI Corporation 4 awardees, including UGI Utilities Inc., UGI Energy Services, LLC and Amerigas Propane, L.P. Top agencies DOJ (Department of Justice) SSA (Social Security Administration) Treasury (Department of the Treasury)	$1,257,205	0.6%	Rank history: #12 in FY2022, #15 in FY2023, #24 in FY2024 and not on the FY2025 list; down 11 since FY2020.
28	Xpress Natural Gas LLC Top agencies VA (Department of Veterans Affairs)	$1,094,129	0.5%	Rank history: #40 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; up 125 since FY2020.
29	Toro Partners GP Inc. 2 awardees, including Toro Partners II, LP Top agencies NASA (National Aeronautics and Space Administration)	$1,017,330	0.5%	Rank history: #41 in FY2022, #46 in FY2023, #98 in FY2024 and not on the FY2025 list; up 25 since FY2020.
30	United Energy Corporation Through United Energy Trading, LLC Top agencies NASA (National Aeronautics and Space Administration) VA (Department of Veterans Affairs)	$1,007,000	0.5%	Rank history: #35 in FY2022, #40 in FY2023, #23 in FY2024 and #2 in FY2025; new, not ranked in FY2020.
31	DTE Energy Company 2 awardees, including DTE Gas Company Top agencies DOJ (Department of Justice) Army (Department of the Army) NARA (National Archives and Records Administration)	$959,940	0.5%	Rank history: #39 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
32	City of Marianna Top agencies DOJ (Department of Justice)	$949,400	0.5%	Rank history: #89 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
33	Northeast Utilities 3 awardees, including Eversource Energy Service Company Top agencies DOJ (Department of Justice) DOT (Department of Transportation)	$926,073	0.4%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
34	West Coast Gas Company, Inc. Top agencies DOJ (Department of Justice)	$898,917	0.4%	Rank history: #38 in FY2022, #28 in FY2023, #55 in FY2024 and #36 in FY2025; up 18 since FY2020.
35	Tri-Mont Engineering Co. Top agencies USAF (Department of the Air Force)	$892,787	0.4%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
36	Constellation Newenergy - Gas Division, LLC Top agencies VA (Department of Veterans Affairs) NARA (National Archives and Records Administration) RRB (Railroad Retirement Board)	$870,748	0.4%	Rank history: #3 in FY2022, #56 in FY2023, #26 in FY2024 and #15 in FY2025; down 31 since FY2020.
37	Yeongnam Energy Service Co., Ltd. Top agencies Army (Department of the Army)	$840,000	0.4%	Rank history: not on the FY2022–FY2024 lists and #31 in FY2025; up 72 since FY2020.
38	New Jersey Resources Corporation Through New Jersey Natural Gas Company Top agencies Navy (Department of the Navy)	$746,661	0.4%	Rank history: #44 in FY2022, #45 in FY2023, #44 in FY2024 and #64 in FY2025; up 44 since FY2020.
39	Elevation Energy Group, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) GSA (General Services Administration)	$736,780	0.4%	Rank history: #34 in FY2022, #41 in FY2023, #45 in FY2024 and not on the FY2025 list; up 33 since FY2020.
40	Entergy Corporation Through Entergy Louisiana, LLC Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security)	$736,434	0.4%	Rank history: #36 in FY2022, #34 in FY2023, #52 in FY2024 and not on the FY2025 list; down 1 since FY2020.
41	Yesco Co.,Ltd Top agencies Army (Department of the Army)	$735,082	0.4%	Rank history: #61 in FY2022, #52 in FY2023, not on the FY2024 list and #84 in FY2025; up 6 since FY2020.
42	Alabama Gas Corporation 2 awardees, including Spire Alabama Inc. and Spire Missouri Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) Treasury (Department of the Treasury)	$672,546	0.3%	Rank history: #51 in FY2022, #68 in FY2023, #40 in FY2024 and not on the FY2025 list; down 8 since FY2020.
43	Citipower, LLC Top agencies DOJ (Department of Justice)	$659,157	0.3%	Rank history: #45 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
44	NRG Energy, Inc. 2 awardees, including NRG Business Marketing LLC and Direct Energy Business LLC Top agencies Army (Department of the Army) SSA (Social Security Administration) GSA (General Services Administration)	$644,964	0.3%	Rank history: #6 in FY2022, not on the FY2023–FY2024 lists and #82 in FY2025; new, not ranked in FY2020.
45	SK C&C Co. Ltd. 2 awardees, including Yeongnam Energy Service Co., Ltd. and Ko-One Energy Service Co.,Ltd Top agencies Army (Department of the Army)	$643,426	0.3%	Rank history: #32 in FY2022, #27 in FY2023, #33 in FY2024 and #52 in FY2025; down 13 since FY2020.
46	Wisconsin Electric 3 awardees, including The Peoples Gas Lght & Coke Co, Wisconsin Gas LLC and Minnesota Energy Resources Corporation Top agencies DOJ (Department of Justice) SSA (Social Security Administration) RRB (Railroad Retirement Board)	$615,521	0.3%	Rank history: #43 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 72 since FY2020.
47	Massachusetts Development Finance Agency Top agencies DOJ (Department of Justice)	$609,235	0.3%	Rank history: #53 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
48	New Mexico Gas Company Inc. 2 awardees, including Peoples Gas System, Inc. Top agencies DOI (Department of the Interior) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$584,429	0.3%	Rank history: #23 in FY2022, #30 in FY2023, #71 in FY2024 and not on the FY2025 list; down 29 since FY2020.
49	Nextera Energy Services Gas, LLC Top agencies USAF (Department of the Air Force)	$565,000	0.3%	Rank history: not on the FY2022–FY2023 lists, #81 in FY2024 and #22 in FY2025; down 36 since FY2020.
50	Delta Natural Gas Company Inc. 2 awardees Top agencies DOJ (Department of Justice)	$552,594	0.3%	Rank history: #83 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; new, not ranked in FY2020.
51	Ameresco Inc. Through Ameresco Select, Inc. Top agencies Army (Department of the Army)	$512,877	0.2%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; up 66 since FY2020.
52	Duke Energy Corporation 2 awardees, including Piedmont Natural Gas Company, Inc. and Duke Energy Progress, LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$511,399	0.2%	Rank history: #28 in FY2022, #18 in FY2023, #15 in FY2024 and #17 in FY2025; up 45 since FY2020.
53	G & K, Incorporated Top agencies USAF (Department of the Air Force)	$510,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
54	Energymark LLC Top agencies VA (Department of Veterans Affairs)	$501,268	0.2%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; up 31 since FY2020.
55	Seoul City Gas Co.,Ltd. Top agencies Army (Department of the Army)	$480,602	0.2%	Rank history: #60 in FY2022, not on the FY2023 list, #87 in FY2024 and #65 in FY2025; down 9 since FY2020.
56	Jo-Carroll Energy, Inc. Top agencies DOJ (Department of Justice)	$453,002	0.2%	Rank history: #69 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
57	MDU Resources Group, Inc. 4 awardees, including Cascade Natural Gas Corp and Intermountain Gas Company Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$426,194	0.2%	Rank history: #50 in FY2022, #50 in FY2023, #53 in FY2024 and #41 in FY2025; down 16 since FY2020.
58	The Gas Company, LLC Top agencies DOJ (Department of Justice)	$407,240	0.2%	Rank history: #25 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2020.
59	Natural Energy Utility Corp Top agencies DOJ (Department of Justice)	$406,747	0.2%	Rank history: not on the FY2022 list, #88 in FY2023, not on the FY2024 list and #73 in FY2025; up 27 since FY2020.
60	City of Leesburg Top agencies DOJ (Department of Justice)	$401,111	0.2%	Rank history: #54 in FY2022, #63 in FY2023, #62 in FY2024 and not on the FY2025 list; up 23 since FY2020.
61	Navajo Nation Tribal Government Through Navajo Tribal Utility Authority Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$395,245	0.2%	Rank history: not on the FY2022–FY2025 lists; up 150 since FY2020.
62	Ameren Corporation 2 awardees, including Ameren Services Company Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$390,963	0.2%	Rank history: #66 in FY2022, #75 in FY2023, #86 in FY2024 and not on the FY2025 list; up 123 since FY2020.
63	Colonial Group Inc. Through Colonial Energy Inc. Top agencies VA (Department of Veterans Affairs)	$383,793	0.2%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; up 114 since FY2020.
64	Daesung Energy Co.,Ltd. Top agencies Army (Department of the Army)	$380,000	0.2%	Rank history: not on the FY2022–FY2024 lists and #40 in FY2025; up 16 since FY2020.
65	NRG Business Marketing LLC Top agencies DOJ (Department of Justice) GSA (General Services Administration) NARA (National Archives and Records Administration)	$379,897	0.2%	Rank history: #56 in FY2022, #4 in FY2023, not on the FY2024 list and #1 in FY2025; down 63 since FY2020.
66	City of Corpus Christi 2 awardees Top agencies Navy (Department of the Navy)	$371,923	0.2%	Rank history: not on the FY2022 list, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
67	Daesung Holdings Co. Ltd. Through Daesung Energy Co.,Ltd. Top agencies Army (Department of the Army)	$363,938	0.2%	Rank history: #48 in FY2022, #43 in FY2023, #37 in FY2024 and not on the FY2025 list; up 22 since FY2020.
68	Public Service Enterprise Group Incorporated Through Public Service Electric and Gas Company Top agencies DOJ (Department of Justice)	$362,678	0.2%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Kentucky Frontier Gas, Llc. Top agencies DOJ (Department of Justice)	$356,045	0.2%	Rank history: #67 in FY2022, #65 in FY2023, #76 in FY2024 and #58 in FY2025; up 39 since FY2020.
70	Northwest Natural Gas Company Top agencies DOJ (Department of Justice) DOI (Department of the Interior) DOE (Department of Energy)	$321,511	0.2%	Rank history: #63 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
71	Welch Gas Cooperative Association Top agencies DOJ (Department of Justice)	$312,604	0.1%	Rank history: #72 in FY2022, #72 in FY2023, #68 in FY2024 and #66 in FY2025; up 35 since FY2020.
72	Mountaineer Gas Co Top agencies DOJ (Department of Justice) DOL (Department of Labor)	$300,341	0.1%	Rank history: not on the FY2022–FY2023 lists, #77 in FY2024 and #60 in FY2025; down 22 since FY2020.
73	Southwest Gas Corporation Top agencies DOJ (Department of Justice) DOI (Department of the Interior)	$293,683	0.1%	Rank history: #42 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; down 46 since FY2020.
74	Magnum Hunter Production Inc Through AXP Energy, Inc. Top agencies DOJ (Department of Justice)	$283,376	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Fireside Natural Gas LLC Top agencies USAF (Department of the Air Force)	$266,000	0.1%	Rank history: #49 in FY2022, #53 in FY2023, #49 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
76	Black Hills Corporation 3 awardees, including Black Hills Service Company, LLC and Black Hills Utility Holdings Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services) Army (Department of the Army)	$242,899	0.1%	Rank history: #58 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
77	Tauber Oil Company Through Interconn Resources LLC Top agencies DOJ (Department of Justice)	$234,178	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
78	City of Las Cruces Top agencies NASA (National Aeronautics and Space Administration)	$224,000	0.1%	Rank history: #82 in FY2022, #89 in FY2023, #73 in FY2024 and #100 in FY2025; up 78 since FY2020.
79	Xcel Energy 2 awardees, including Public Service Company of Colorado Top agencies Treasury (Department of the Treasury) Army (Department of the Army) NARA (National Archives and Records Administration)	$218,948	0.1%	Rank history: #57 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; down 56 since FY2020.
80	City of Bennettsville Top agencies DOJ (Department of Justice)	$209,422	0.1%	Rank history: #75 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 50 since FY2020.
81	Empire Natural Gas Corporation Top agencies VA (Department of Veterans Affairs)	$201,548	0.1%	Rank history: #78 in FY2022, #60 in FY2023, #48 in FY2024 and #50 in FY2025; up 13 since FY2020.
82	Essential Utilities, Inc. Through Peoples Natural Gas Company LLC Top agencies DOE (Department of Energy) DOJ (Department of Justice)	$193,568	0.1%	Rank history: #71 in FY2022, #55 in FY2023, #79 in FY2024 and #83 in FY2025; up 56 since FY2020.
83	South Jersey Industries Inc. Through South Jersey Gas Co Top agencies DOJ (Department of Justice)	$184,993	0.1%	Rank history: #79 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
84	City of Duluth Top agencies DOJ (Department of Justice)	$169,934	0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
85	Kotzebue Electric Association, Inc. Top agencies USAF (Department of the Air Force)	$160,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 34 since FY2020.
86	Atlanta Gas Light Company Top agencies Army (Department of the Army)	$143,495	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Commercial Energy of Montana Inc. Top agencies HHS (Department of Health and Human Services)	$120,000	0.1%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and #90 in FY2025; up 100 since FY2020.
88	Alliant Energy Corporation Through Interstate Power and Light Company Top agencies NARA (National Archives and Records Administration)	$112,900	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
89	Graham County Electric Cooperative Inc. Top agencies DOJ (Department of Justice)	$96,820	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 63 since FY2020.
90	The Southeast Alabama Gas District Top agencies Army (Department of the Army)	$91,816	<0.1%	Rank history: #97 in FY2022, not on the FY2023 list, #95 in FY2024 and #97 in FY2025; up 39 since FY2020.
91	Arrowhead Transfer, Inc. Top agencies DOT (Department of Transportation)	$90,010	<0.1%	Rank history: #81 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
92	Ferrellgas Partners L.P. Through Ferrellgas, L.P Top agencies Army (Department of the Army) DOJ (Department of Justice)	$81,223	<0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 48 since FY2020.
93	Guam Refinery and Environmental Services Company Through Gresco, Inc. Top agencies Navy (Department of the Navy)	$81,060	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 66 since FY2020.
94	City of Fresno Top agencies Treasury (Department of the Treasury)	$79,050	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Liberty Utilities (Energynorth Natural Gas) Corp. Top agencies DOJ (Department of Justice)	$77,292	<0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; down 32 since FY2020.
96	East Coast Power & Gas, LLC Top agencies GSA (General Services Administration)	$71,957	<0.1%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; down 25 since FY2020.
97	UNS Electric Inc. 2 awardees, including Central Hudson Gas & Electric Corporation Top agencies NARA (National Archives and Records Administration)	$62,210	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 115 since FY2020.
98	Snyder Brothers Inc Top agencies NASA (National Aeronautics and Space Administration)	$61,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Northern Virginia Electric Cooperative Through Novec Energy Solutions Inc. Top agencies NASA (National Aeronautics and Space Administration)	$42,626	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
100	Scana Energy Marketing, LLC Top agencies VA (Department of Veterans Affairs)	$42,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 93 since FY2020.

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100 of 141 contractors listed here. See the rest on GovTribe.

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 $209 million 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 S111 contractors in FY2021?

1. WGL Energy Services Inc. ($24.5M), 2. Centrica PLC ($21.1M), 3. Exelon Corporation ($13.7M), 4. Omega Pipeline Company, LLC ($9.69M), 5. Tiger Natural Gas, Inc. ($7.96M), 6. Foreign Utility Consolidated Reporting ($6.49M), 7. Centerpoint Energy Services Inc. ($6.2M), 8. Buyo Gas Co.,Ltd. ($5.66M), 9. Nextera Energy Inc. ($5.46M), 10. Sage Energy Trading LLC ($5.34M).

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