Company lists · Data refreshed September 2026

Top 25 On-site power generation companies based in the United States

Name: On-site power generation companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,443 companies tracked

RevenueBase identified 1,443 on-site power generation companies headquartered in the United States as of September 2026 and tracks 36,587 professional contacts across them, including 13,236 with verified work emails. Houston is the largest hub.

This list covers on-site power generation companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

1,443Companies

36,587Contacts tracked

13,236Verified emails

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The 25 largest on-site power generation companies based in the United States

Ranked by team size

Top 25 of 1,443 on-site power generation companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to on-site power generation companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Fieldcore	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	10001+	3,700 contacts →
	Partial evidence “GE Vernova is a planned, purpose-built global energy company that includes Power, Wind, and Electrification businesses and is supported by its accelerator businesses of Advanced…” Source: RevenueBase Database · checked Sep 20, 2026
2	Bloom Energy	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,221 contacts →
	Indirect evidence “Bloom Energy empowers businesses and communities to responsibly take charge of their energy.” Source: RevenueBase Database · checked Sep 20, 2026
3	Calpine	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,112 contacts →
	Indirect evidence “A business unit of Constellation (NASDAQ: CEG), Calpine Corporation is America’s largest generator of electricity from natural gas and geothermal resources with operations in…” Source: RevenueBase Database · checked Sep 20, 2026
4	Mitsubishi Power Americas	Strong evidence	Lake Mary, FL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,859 contacts →
	Strong evidence “Mitsubishi Power Americas is creating a future that works for people and the planet through innovative power generation technology and solutions.” Source: RevenueBase Database · checked Sep 20, 2026
5	Clearway Energy Group	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 20, 2026	501-1,000	795 contacts →
	Indirect evidence “Clearway Energy Group’s vision is a world powered by clean energy.” Source: RevenueBase Database · checked Sep 20, 2026
6	Alterman, INC	Partial evidence	Live Oak, TX, United StatesHQ checked Sep 20, 2026	501-1,000	597 contacts →
	Partial evidence “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Source: RevenueBase Database · checked Sep 20, 2026
7	Soenergy International	Indirect evidence	Doral, FL, United StatesHQ checked Sep 20, 2026	1,001-5,000	567 contacts →
	Indirect evidence “SoEnergy is a global provider of "energy as a service", ensuring customized solutions for a diverse array of organizations and industries worldwide, such as mining, oil & gas…” Source: RevenueBase Database · checked Sep 20, 2026
8	Saber Power	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	521 contacts →
	Partial evidence “Saber Power Services, a portfolio company of Greenbelt Capital Partners, is a fully integrated electrical power system services firm providing end-to-end solutions across utility…” Source: RevenueBase Database · checked Sep 20, 2026
9	APR Energy	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 20, 2026	201-500	502 contacts →
	Indirect evidence “APR Energy delivers reliable electricity, fast.” Source: RevenueBase Database · checked Sep 20, 2026
10	EC Electric	Strong evidence	Portland, OR, United StatesHQ checked Sep 20, 2026	1,001-5,000	490 contacts →
	Strong evidence “Our lives function on a power grid.” Source: RevenueBase Database · checked Sep 20, 2026
11	Noresco	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 20, 2026	201-500	481 contacts →
	Indirect evidence “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Source: RevenueBase Database · checked Sep 20, 2026
12	Mainspring Energy	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 20, 2026	201-500	479 contacts →
	Partial evidence “Mainspring is a power generator manufacturer redefining how local power is delivered to capacity constrained companies and communities.” Source: RevenueBase Database · checked Sep 20, 2026
13	Babcock Power	Strong evidence	Danvers, MA, United StatesHQ checked Sep 20, 2026	501-1,000	476 contacts →
	Strong evidence “Finding a single capable partner to support both large- and small-scale power generation needs can be challenging.” Source: RevenueBase Database · checked Sep 20, 2026
14	Concentric Power Services	Partial evidence	Carrollton, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	426 contacts →
	Partial evidence “Concentric is the first national industrial power services organization delivering forklift and critical power as well as maintenance solutions that ensure uninterrupted…” Source: RevenueBase Database · checked Sep 20, 2026
15	Supernova	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 20, 2026	201-500	370 contacts →
	Indirect evidence “Supernova embodies the spirit of innovation and dedication to a sustainable future, making it a shining example of what it means to be a leader in the renewable energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
16	Solaris Energy Infrastructure	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	331 contacts →
	Strong evidence “Solaris Energy Infrastructure (NYSE: SEI) delivers proprietary power generation and distribution solutions, as well as logistics equipment and services, to clients in the data…” Source: RevenueBase Database · checked Sep 20, 2026
17	Mesa Power Solutions	Partial evidence	Loveland, CO, United StatesHQ checked Sep 20, 2026	1,001-5,000	329 contacts →
	Partial evidence “We are a leading energy services provider specializing in the engineering, manufacturing, sales, leasing, and operations of cutting-edge power technology including natural gas and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Power Plus	Partial evidence	Anaheim, CA, United StatesHQ checked Sep 20, 2026	201-500	323 contacts →
	Partial evidence “For more than 35 years, Power Plus has been serving our customers across the Country providing Temporary Power, Rental Generators, and performing Generator Service & Maintenance.” Source: RevenueBase Database · checked Sep 20, 2026
19	IHI Power Services Corp	Strong evidence	Aliso Viejo, CA, United StatesHQ checked Sep 20, 2026	501-1,000	319 contacts →
	Strong evidence “IHI Power Services Corp.(IPSC) provides operations, maintenance, and management services to the US power generation industry.” Source: RevenueBase Database · checked Sep 20, 2026
20	Sunbelt Solomon	Partial evidence	Temple, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	271 contacts →
	Partial evidence “Sunbelt Solomon is a leading provider of customized electrical power solutions and services.” Source: RevenueBase Database · checked Sep 20, 2026
21	Novel Energy Solutions	Indirect evidence	St Paul, MN, United StatesHQ checked Sep 20, 2026	201-500	218 contacts →
	Indirect evidence “Novel Energy delivers solar energy solutions helping provide sustainable options to meet evolving energy needs.” Source: RevenueBase Database · checked Sep 20, 2026
22	Motor City Electric CO	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 20, 2026	501-1,000	215 contacts →
	Indirect evidence “Detroit-headquartered Motor City Electric Co.(MCE) is one of the largest contractors in the nation, and has built an organization centered around service, capability, safety, and…” Source: RevenueBase Database · checked Sep 20, 2026
23	REX Moore Electrical & Systems Contractors & Engineers	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 20, 2026	501-1,000	208 contacts →
	Indirect evidence “Rex Moore Group, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
24	Generator Supercenter	Indirect evidence	Tomball, TX, United StatesHQ checked Sep 20, 2026	501-1,000	205 contacts →
	Indirect evidence “Generator Supercenter is a company based out of United States.” Source: RevenueBase Database · checked Sep 20, 2026
25	Maverick Power	Partial evidence	Mckinney, TX, United StatesHQ checked Sep 20, 2026	201-500	205 contacts →
	Partial evidence “At Maverick Power, we are revolutionizing power solutions for businesses with a strong commitment to innovation, efficiency, and reliability.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: on-site power generation companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names on-site power generation companies.
Partial evidence: Its own public description names part of on-site power generation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name on-site power generation companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,443 on-site power generation companies based in the United States

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On-site power generation companies based in the United States at a glance

As of Sep 20, 2026

36.2%Verified-email coverage

25.4Average contacts per company

11-50Median size (employees)

4.2%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

597

11-50

551

51-200

202

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,443 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among on-site power generation companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “on-site power generation companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names on-site power generation companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among on-site power generation companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 13,236 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

On-site power generation companies by metro

On-site power generation companies in Houston60

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names on-site power generation companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many on-site power generation companies are there based in the United States?

RevenueBase identified 1,443 on-site power generation companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Fieldcore, headquartered in Atlanta, tops this list with the largest team on record.

Which city has the most on-site power generation companies?

Houston leads with 60 headquartered companies, followed by New York (20) and Austin (19).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 13,236 verified decision-maker contacts tracked across these 1,443 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.