Top 100 Contractors in NAICS 221210: Natural Gas Distribution, FY2021

Name: Top 100 Contractors in NAICS 221210: Natural Gas Distribution, FY2021
Creator: GovTribe

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

The top 10 won 56% of FY2021 NAICS 221210 contract dollars

Contract obligations: $199,412,555 Net of deobligations, by contracts coded NAICS 221210
Contractors: 165 Parent companies with an obligation
Largest contractor: WGL Energy Services Inc. $38.2 million, 16.8% 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 Washington Gas Light Company and Semco Energy, Inc. Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) Smithsonian (Smithsonian Institution)	$38,198,949	16.8%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 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)	$21,641,705	9.5%	Rank history: not on the FY2022 list, #10 in FY2023, #2 in FY2024 and not on the FY2025 list; up 26 since FY2020.
3	New Mexico Gas Company Inc. 2 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)	$14,891,181	6.5%	Rank history: #22 in FY2022, #22 in FY2023, #76 in FY2024 and not on the FY2025 list; down 1 since FY2020.
4	Omega Pipeline Company, LLC Top agencies Army (Department of the Army)	$9,692,557	4.3%	Rank history: #7 in FY2022, #8 in FY2023, #13 in FY2024 and #12 in FY2025; up 4 since FY2020.
5	Navajo Nation Tribal Government Through Navajo Tribal Utility Authority Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$8,497,035	3.7%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
6	Exelon Corporation 6 awardees, including Constellation Newenergy - Gas Division, LLC Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) GSA (General Services Administration)	$8,404,165	3.7%	Rank history: #32 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
7	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$7,899,148	3.5%	Rank history: #6 in FY2022, #4 in FY2023, #6 in FY2024 and #7 in FY2025; down 2 since FY2020.
8	Sage Energy Trading LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Treasury (Department of the Treasury)	$5,950,179	2.6%	Rank history: #13 in FY2022, #13 in FY2023, #14 in FY2024 and #23 in FY2025; up 1 since FY2020.
9	Centerpoint Energy Services Inc. Through Nextera Energy Services Gas, LLC Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice) NARA (National Archives and Records Administration)	$5,834,658	2.6%	Rank history: #9 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 150 since FY2020.
10	Buyo Gas Co.,Ltd. 2 awardees, including Buyo Ekika Gas Co., Ltd. Top agencies USAF (Department of the Air Force)	$5,661,190	2.5%	Rank history: #5 in FY2022, #3 in FY2023, #5 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
11	City of Philadelphia Top agencies DOI (Department of the Interior) Navy (Department of the Navy) Treasury (Department of the Treasury)	$5,249,994	2.3%	Rank history: #4 in FY2022, #40 in FY2023, #48 in FY2024 and #38 in FY2025; up 14 since FY2020.
12	Kyungnam Energy Co. Ltd Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,203,392	2.3%	Rank history: #98 in FY2022, not on the FY2023 list, #85 in FY2024 and not on the FY2025 list; up 127 since FY2020.
13	Georgia Power Company 4 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)	$5,016,739	2.2%	Rank history: #17 in FY2022, #11 in FY2023, #11 in FY2024 and #17 in FY2025; up 8 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	1.8%	Rank history: #16 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
15	One Gas Inc. 4 awardees Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOJ (Department of Justice)	$3,448,841	1.5%	Rank history: #15 in FY2022, #14 in FY2023, #12 in FY2024 and #11 in FY2025; down 2 since FY2020.
16	Cobb Electric Membership Corporation Through Gas South, LLC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) DOJ (Department of Justice)	$2,829,202	1.2%	Rank history: #20 in FY2022, #7 in FY2023, #8 in FY2024 and #13 in FY2025; up 72 since FY2020.
17	Enspire Energy, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$2,759,183	1.2%	Rank history: #19 in FY2022, #26 in FY2023, #17 in FY2024 and #20 in FY2025; up 14 since FY2020.
18	Samchully Co.,Ltd. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,662,180	1.2%	Rank history: #8 in FY2022, #6 in FY2023, #10 in FY2024 and #10 in FY2025; down 14 since FY2020.
19	Tiger Natural Gas, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) GSA (General Services Administration)	$2,223,928	1.0%	Rank history: #21 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
20	UGI Corporation 4 awardees, including UGI Utilities Inc., Amerigas Propane, L.P. and UGI Energy Services, LLC Top agencies DOJ (Department of Justice) Navy (Department of the Navy) SSA (Social Security Administration)	$2,139,739	0.9%	Rank history: #11 in FY2022, #15 in FY2023, #23 in FY2024 and not on the FY2025 list; down 8 since FY2020.
21	Hanjin Heavy Industries & Construction Holdings Co. Ltd. Through Daeryun E&S Co., Ltd. Top agencies Army (Department of the Army)	$2,007,438	0.9%	Rank history: #31 in FY2022, #32 in FY2023, #38 in FY2024 and #25 in FY2025; up 12 since FY2020.
22	Arapaho Communications. LP Top agencies DOJ (Department of Justice)	$1,992,335	0.9%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
23	A.i.m. Energy S.R.L. Top agencies Army (Department of the Army)	$1,832,353	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
24	Dominion Resources Inc. 5 awardees, including Public Service Company of North Carolina, Incorporated, Dominion Energy South Carolina, Inc. and Hope Gas, Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army) DOE (Department of Energy)	$1,518,047	0.7%	Rank history: #27 in FY2022, #28 in FY2023, #39 in FY2024 and #56 in FY2025; up 22 since 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)	$1,284,471	0.6%	Rank history: #39 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 138 since FY2020.
26	PS Energy Group, Inc. Top agencies DOJ (Department of Justice)	$1,266,544	0.6%	Rank history: #25 in FY2022, #52 in FY2023, #52 in FY2024 and #40 in FY2025; up 8 since FY2020.
27	Energetic SPA Top agencies Army (Department of the Army)	$1,116,560	0.5%	Rank history: #18 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
28	Xpress Natural Gas LLC Top agencies VA (Department of Veterans Affairs)	$1,094,129	0.5%	Rank history: #40 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 120 since FY2020.
29	SAN Diego Gas & Electric Company 2 awardees, including Southern California Gas Company Top agencies DOJ (Department of Justice) DOI (Department of the Interior) Navy (Department of the Navy)	$1,039,900	0.5%	Rank history: #46 in FY2022, #48 in FY2023, #63 in FY2024 and not on the FY2025 list; up 10 since FY2020.
30	Toro Partners GP Inc. 2 awardees, including Toro Partners II, LP Top agencies NASA (National Aeronautics and Space Administration)	$1,017,330	0.4%	Rank history: #41 in FY2022, #49 in FY2023, #89 in FY2024 and not on the FY2025 list; up 20 since FY2020.
31	United Energy Corporation Through United Energy Trading, LLC Top agencies NASA (National Aeronautics and Space Administration) VA (Department of Veterans Affairs)	$1,007,000	0.4%	Rank history: #35 in FY2022, #37 in FY2023, #25 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
32	City of Marianna Top agencies DOJ (Department of Justice)	$949,400	0.4%	Rank history: #44 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
33	West Coast Gas Company, Inc. Top agencies DOJ (Department of Justice)	$898,917	0.4%	Rank history: #38 in FY2022, #31 in FY2023, #53 in FY2024 and #32 in FY2025; up 14 since FY2020.
34	Tri-Mont Engineering Co. Top agencies USAF (Department of the Air Force)	$892,787	0.4%	Rank history: #54 in FY2022, #46 in FY2023, #45 in FY2024 and #36 in FY2025; up 23 since FY2020.
35	Constellation Newenergy - Gas Division, LLC Top agencies VA (Department of Veterans Affairs) NARA (National Archives and Records Administration)	$858,848	0.4%	Rank history: #3 in FY2022, #53 in FY2023, #26 in FY2024 and #16 in FY2025; down 29 since FY2020.
36	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 #30 in FY2025; up 69 since FY2020.
37	New Jersey Resources Corporation Through New Jersey Natural Gas Company Top agencies Navy (Department of the Navy)	$748,710	0.3%	Rank history: #50 in FY2022, #47 in FY2023, #42 in FY2024 and #57 in FY2025; up 41 since FY2020.
38	Elevation Energy Group, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) GSA (General Services Administration)	$736,780	0.3%	Rank history: #34 in FY2022, #39 in FY2023, #43 in FY2024 and not on the FY2025 list; up 27 since FY2020.
39	Yesco Co.,Ltd Top agencies Army (Department of the Army)	$735,082	0.3%	Rank history: #60 in FY2022, #55 in FY2023, not on the FY2024 list and #77 in FY2025; down 1 since FY2020.
40	BSE Performance, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$696,678	0.3%	Rank history: #45 in FY2022, #38 in FY2023, #34 in FY2024 and #80 in FY2025; up 27 since FY2020.
41	United Paradyne Corp Top agencies Navy (Department of the Navy)	$678,370	0.3%	Rank history: #43 in FY2022, #23 in FY2023, #56 in FY2024 and not on the FY2025 list; unchanged since FY2020.
42	Citipower, LLC Top agencies DOJ (Department of Justice)	$659,157	0.3%	Rank history: #47 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
43	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: #33 in FY2022, #27 in FY2023, #32 in FY2024 and #44 in FY2025; down 13 since FY2020.
44	Gas Pipeline Services Inc. Top agencies Army (Department of the Army)	$635,580	0.3%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
45	Tauber Oil Company Through Interconn Resources LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$623,449	0.3%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
46	Centerpoint Energy, Inc. 5 awardees, including Vectren Energy Delivery of Ohio, LLC, Vectren LLC and Enable Gas Transmission LLC Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) Army (Department of the Army)	$622,031	0.3%	Rank history: #24 in FY2022, #43 in FY2023, #41 in FY2024 and #79 in FY2025; down 31 since FY2020.
47	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)	$615,450	0.3%	Rank history: #52 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 69 since FY2020.
48	Massachusetts Development Finance Agency Top agencies DOJ (Department of Justice)	$609,235	0.3%	Rank history: #55 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
49	Delta Natural Gas Company Inc. 2 awardees Top agencies DOJ (Department of Justice)	$552,594	0.2%	Rank history: #82 in FY2022, not on the FY2023 list, #100 in FY2024 and #73 in FY2025; new, not ranked in FY2020.
50	Ameresco Inc. Through Ameresco Select, Inc. Top agencies Army (Department of the Army)	$512,877	0.2%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 63 since FY2020.
51	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.
52	UEI DUQKYFJM9C94 Top agencies Army (Department of the Army)	$488,416	0.2%	Rank history: #62 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
53	Seoul City Gas Co.,Ltd. Top agencies Army (Department of the Army)	$480,602	0.2%	Rank history: #59 in FY2022, not on the FY2023 list, #79 in FY2024 and #58 in FY2025; down 17 since FY2020.
54	Merrimac Petroleum, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$458,430	0.2%	Rank history: #66 in FY2022, #63 in FY2023, #37 in FY2024 and #54 in FY2025; up 20 since FY2020.
55	Jo-Carroll Energy, Inc. Top agencies DOJ (Department of Justice)	$453,002	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 44 since FY2020.
56	Duke Energy Corporation Through Piedmont Natural Gas Company, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$412,929	0.2%	Rank history: #29 in FY2022, #19 in FY2023, #16 in FY2024 and #19 in FY2025; up 39 since FY2020.
57	The Gas Company, LLC Top agencies DOJ (Department of Justice)	$407,240	0.2%	Rank history: #23 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; down 25 since FY2020.
58	Natural Energy Utility Corp Top agencies DOJ (Department of Justice)	$406,747	0.2%	Rank history: #48 in FY2022, #56 in FY2023, not on the FY2024 list and #50 in FY2025; up 25 since FY2020.
59	Colonial Group Inc. Through Colonial Energy Inc. Top agencies VA (Department of Veterans Affairs)	$383,793	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 124 since FY2020.
60	Daesung Energy Co.,Ltd. Top agencies Army (Department of the Army)	$380,000	0.2%	Rank history: not on the FY2022–FY2024 lists and #33 in FY2025; up 16 since FY2020.
61	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: not on the FY2022 list, #5 in FY2023, #19 in FY2024 and #3 in FY2025; down 58 since FY2020.
62	Daesung Holdings Co. Ltd. Through Daesung Energy Co.,Ltd. Top agencies Army (Department of the Army)	$363,938	0.2%	Rank history: #51 in FY2022, #42 in FY2023, #35 in FY2024 and not on the FY2025 list; up 25 since FY2020.
63	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.
64	Kentucky Frontier Gas, Llc. Top agencies DOJ (Department of Justice)	$356,045	0.2%	Rank history: #61 in FY2022, #69 in FY2023, #68 in FY2024 and #51 in FY2025; up 40 since FY2020.
65	Red River Resources LLC Top agencies DOI (Department of the Interior) Army (Department of the Army)	$337,272	0.1%	Rank history: not on the FY2022–FY2023 lists, #98 in FY2024 and not on the FY2025 list; up 84 since FY2020.
66	Northwest Natural Gas Company Top agencies DOJ (Department of Justice) DOI (Department of the Interior) DOE (Department of Energy)	$321,511	0.1%	Rank history: #63 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
67	Welch Gas Cooperative Association Top agencies DOJ (Department of Justice)	$312,604	0.1%	Rank history: #72 in FY2022, #74 in FY2023, #61 in FY2024 and #59 in FY2025; up 36 since FY2020.
68	Amerigas Propane, L.P. Top agencies Navy (Department of the Navy)	$300,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.
69	Mountaineer Gas Co Top agencies DOJ (Department of Justice) DOL (Department of Labor)	$299,997	0.1%	Rank history: not on the FY2022–FY2023 lists, #69 in FY2024 and #55 in FY2025; down 26 since FY2020.
70	Southwest Gas Corporation Top agencies DOJ (Department of Justice) DOI (Department of the Interior)	$293,683	0.1%	Rank history: #42 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; down 47 since FY2020.
71	TV Guy Orlando, LLC Top agencies DOJ (Department of Justice) Army (Department of the Army)	$291,365	0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
72	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.
73	MDU Resources Group, Inc. 4 awardees, including Cascade Natural Gas Corp and Intermountain Gas Company Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services) DOI (Department of the Interior)	$229,949	0.1%	Rank history: #64 in FY2022, #78 in FY2023, #62 in FY2024 and #46 in FY2025; down 18 since FY2020.
74	JPC Energy, LLC Top agencies DOJ (Department of Justice)	$224,305	0.1%	Rank history: #67 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
75	City of Las Cruces Top agencies NASA (National Aeronautics and Space Administration)	$224,000	0.1%	Rank history: #81 in FY2022, #86 in FY2023, #65 in FY2024 and #93 in FY2025; up 76 since FY2020.
76	Brooklyn Navy Yard Development Corp Top agencies DOJ (Department of Justice)	$210,000	0.1%	Rank history: not on the FY2022 list, #92 in FY2023, #91 in FY2024 and #89 in FY2025; up 41 since FY2020.
77	City of Bennettsville Top agencies DOJ (Department of Justice)	$209,422	0.1%	Rank history: #53 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 48 since FY2020.
78	Empire Natural Gas Corporation Top agencies VA (Department of Veterans Affairs)	$201,548	0.1%	Rank history: #78 in FY2022, #62 in FY2023, #51 in FY2024 and #43 in FY2025; up 11 since FY2020.
79	Essential Utilities, Inc. Through Peoples Natural Gas Company LLC Top agencies DOE (Department of Energy) DOJ (Department of Justice)	$196,647	0.1%	Rank history: #71 in FY2022, #57 in FY2023, #72 in FY2024 and #76 in FY2025; up 55 since FY2020.
80	South Jersey Industries Inc. Through South Jersey Gas Co Top agencies DOJ (Department of Justice)	$184,993	0.1%	Rank history: #80 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
81	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.
82	Christopher I. Oyolokor SR. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$160,134	0.1%	Rank history: not on the FY2022–FY2025 lists; up 98 since FY2020.
83	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.
84	Navajo Tribal Utility Authority Top agencies DOI (Department of the Interior)	$120,197	0.1%	Rank history: #28 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; down 70 since FY2020.
85	Xcel Energy Through Public Service Company of Colorado Top agencies Treasury (Department of the Treasury)	$120,000	0.1%	Rank history: #90 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
86	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, #90 in FY2024 and not on the FY2025 list; up 109 since FY2020.
87	Peoples Gas System, Inc. Top agencies VA (Department of Veterans Affairs)	$108,154	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 70 since FY2020.
88	The Blossman Companies, Inc. Through Blossman Gas Inc. Top agencies Army (Department of the Army)	$105,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Suburban Propane Partners, L.P 2 awardees Top agencies Army (Department of the Army)	$98,650	<0.1%	Rank history: #96 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	Graham County Electric Cooperative Inc. Top agencies DOJ (Department of Justice)	$96,820	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 57 since FY2020.
91	Precision Pipeline Solutions, LLC Top agencies Army (Department of the Army)	$94,268	<0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 66 since FY2020.
92	The Southeast Alabama Gas District Top agencies Army (Department of the Army)	$91,816	<0.1%	Rank history: #94 in FY2022, #100 in FY2023, #86 in FY2024 and #92 in FY2025; up 32 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 53 since FY2020.
94	Liberty Utilities (Energynorth Natural Gas) Corp. Top agencies DOJ (Department of Justice)	$77,292	<0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; down 38 since FY2020.
95	Crowley Government Services Inc. Through Crowley Fuels LLC Top agencies Commerce (Department of Commerce)	$76,176	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
96	East Coast Power & Gas, LLC Top agencies GSA (General Services Administration)	$71,957	<0.1%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; down 32 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 127 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	Chopro K.K. Top agencies Navy (Department of the Navy)	$58,103	<0.1%	Rank history: #97 in FY2022, #93 in FY2023, #95 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
100	Interconn Resources LLC Top agencies VA (Department of Veterans Affairs)	$57,845	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 51 since FY2020.

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100 of 165 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 $227 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 NAICS 221210 contractors in FY2021?

1. WGL Energy Services Inc. ($38.2M), 2. Centrica PLC ($21.6M), 3. New Mexico Gas Company Inc. ($14.9M), 4. Omega Pipeline Company, LLC ($9.69M), 5. Navajo Nation Tribal Government ($8.5M), 6. Exelon Corporation ($8.4M), 7. Foreign Utility Consolidated Reporting ($7.9M), 8. Sage Energy Trading LLC ($5.95M), 9. Centerpoint Energy Services Inc. ($5.83M), 10. Buyo Gas Co.,Ltd. ($5.66M).

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