Company lists · Data refreshed September 2026

Top 25 Hydroelectric facility maintenance contractors based in the United States

Name: Hydroelectric facility maintenance contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 229 companies tracked

RevenueBase identified 229 hydroelectric facility maintenance contractors headquartered in the United States as of September 2026 and tracks 8,719 professional contacts across them, including 3,292 with verified work emails. Houston is the largest hub.

This list covers hydroelectric facility maintenance contractors 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 16, 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 16, 2026 86% judged on-target in blind review

229Companies

8,719Contacts tracked

3,292Verified emails

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The 25 largest hydroelectric facility maintenance contractors based in the United States

Ranked by team size

Top 25 of 229 hydroelectric facility maintenance contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to hydroelectric facility maintenance contractors: 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	Power Plant Services	Indirect evidence	Melrose Park, IL, United StatesHQ checked Sep 16, 2026	201-500	1,463 contacts →
	Indirect evidence “We are a full service turnkey provider for the power generation industry and those industries generating their own power as a means to an end.” Source: RevenueBase Database · checked Sep 16, 2026
2	Shermco Industries	Partial evidence	Irving, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,221 contacts →
	Partial evidence “Shermco Industries is a provider of safe, reliable testing, repair, professional training, electrical outage planning, maintenance and analysis of rotating apparatus and…” Source: RevenueBase Database · checked Sep 16, 2026
3	Babcock Power	Indirect evidence	Danvers, MA, United StatesHQ checked Sep 16, 2026	501-1,000	476 contacts →
	Indirect evidence “Finding a single capable partner to support both large- and small-scale power generation needs can be challenging.” Source: RevenueBase Database · checked Sep 16, 2026
4	Md&a	Indirect evidence	Latham, NY, United StatesHQ checked Sep 16, 2026	501-1,000	379 contacts →
	Indirect evidence “Mechanical Dynamics & Analysis (MD & A) provides power generation companies around the globe with a full-service OEM alternative for services, parts, and repairs.” Source: RevenueBase Database · checked Sep 16, 2026
5	Teco-Westinghouse	Indirect evidence	Round Rock, TX, United StatesHQ checked Sep 16, 2026	201-500	345 contacts →
	Indirect evidence “TWMC is a leading manufacturer of electric motors and generators, with a broad selection ranging from ¼ HP to HP.” Source: RevenueBase Database · checked Sep 16, 2026
6	Taw, An IPS Company	Indirect evidence	Greenville, SC, United StatesHQ checked Sep 16, 2026	501-1,000	305 contacts →
	Indirect evidence “Excellence in creating innovative solutions for the supply, control and use of energy.” Source: RevenueBase Database · checked Sep 16, 2026
7	RMS Energy Co, LLC	Partial evidence	Little Falls, MN, United StatesHQ checked Sep 16, 2026	501-1,000	288 contacts →
	Partial evidence “RMS Energy leads the industry by energizing the future through reliable power solutions, offering comprehensive installation and maintenance services on 480V to 765kV electrical…” Source: RevenueBase Database · checked Sep 16, 2026
8	TEIC	Indirect evidence	Duncan, SC, United StatesHQ checked Sep 16, 2026	51-200	252 contacts →
	Indirect evidence “Serving Energy Utilities, Renewable Power providers, and Industrial Manufacturing leaders.” Source: RevenueBase Database · checked Sep 16, 2026
9	Toshiba America Energy Systems	Indirect evidence	West Allis, WI, United StatesHQ checked Sep 16, 2026	201-500	208 contacts →
	Indirect evidence “Toshiba America Energy Systems Corporation (TAES), headquartered in Milwaukee, Wisconsin, with major manufacturing and services, provides turbine/generator equipment and services…” Source: RevenueBase Database · checked Sep 16, 2026
10	National Electric Coil	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 16, 2026	501-1,000	153 contacts →
	Indirect evidence “Leading independent manufacturer of generator stator and rotor windings, including inner-water and inner-hydrogen stator bars, roebel bars and diamond coils.” Source: RevenueBase Database · checked Sep 16, 2026
11	Southwest Electric CO	Indirect evidence	Oklahoma City, OK, United StatesHQ checked Sep 16, 2026	201-500	145 contacts →
	Indirect evidence “In 2025, Southwest Electric Co.” Source: RevenueBase Database · checked Sep 16, 2026
12	Allied Power Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	51-200	143 contacts →
	Indirect evidence “APG is a growing independent provider of critical components and services to its customers in the power generation, refining, pipeline, and general industrial sectors.” Source: RevenueBase Database · checked Sep 16, 2026
13	Electric Motor & Contracting Co., INC	Indirect evidence	Chesapeake, VA, United StatesHQ checked Sep 16, 2026	201-500	131 contacts →
	Indirect evidence “Established in 1960, Electric Motor and Contracting remains one of the largest independently owned electric motor and pump repair shops in the U.S.” Source: RevenueBase Database · checked Sep 16, 2026
14	Ideal Electric Company	Indirect evidence	Mansfield, OH, United StatesHQ checked Sep 16, 2026	51-200	110 contacts →
	Indirect evidence “IDEAL Electric is the last 100% American-owned, vertically integrated OEM of its kind.” Source: RevenueBase Database · checked Sep 16, 2026
15	Power Services Group, INC	Partial evidence	Cape Coral, FL, United StatesHQ checked Sep 16, 2026	51-200	107 contacts →
	Partial evidence “Power Services Group (PSG) is the leading US-owned, independent provider of turnkey maintenance, repair, and overhaul solutions for steam and gas turbines.” Source: RevenueBase Database · checked Sep 16, 2026
16	Horner Industrial Group	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 16, 2026	201-500	102 contacts →
	Indirect evidence “For over half a century, Horner Industrial Group has been helping to power your business with industry leading service, quality and value by providing excellence in electrical…” Source: RevenueBase Database · checked Sep 16, 2026
17	Ap4	Indirect evidence	Lakeland, FL, United StatesHQ checked Sep 16, 2026	51-200	91 contacts →
	Indirect evidence “AP4 specialize in Turbine, Control and Excitation parts and services to keep your power plant operational.” Source: RevenueBase Database · checked Sep 16, 2026
18	American Hydro	Indirect evidence	York, PA, United StatesHQ checked Sep 16, 2026	51-200	77 contacts →
	Indirect evidence “Engineering Our focus is to create designs that maximize turbine capacity and efficiency while eliminating cavitation to meet our customers’ needs.” Source: RevenueBase Database · checked Sep 16, 2026
19	Turbine Generator Maintenance	Partial evidence	Cape Coral, FL, United StatesHQ checked Sep 16, 2026	51-200	76 contacts →
	Partial evidence “Turbine Generator Maintenance, Inc.(TGM) is the premier solution provider for steam and combustion turbine and generator inspection, testing, and repair.” Source: RevenueBase Database · checked Sep 16, 2026
20	Kiemle-Hankins	Indirect evidence	Perrysburg, OH, United StatesHQ checked Sep 16, 2026	51-200	68 contacts →
	Indirect evidence “Kiemle-Hankins is a leading industrial service and repair company.” Source: RevenueBase Database · checked Sep 16, 2026
21	Turbinepros	Partial evidence	Dayton, MN, United StatesHQ checked Sep 16, 2026	51-200	67 contacts →
	Partial evidence “TurbinePROs is a field service provider offering OCIC, Maintenance, Repair, Overhaul, and Upgrade of all rotating equipment including turbines, generators, pumps, and compressors…” Source: RevenueBase Database · checked Sep 16, 2026
22	Frank Lill & Son, INC	Indirect evidence	Victor, NY, United StatesHQ checked Sep 16, 2026	501-1,000	67 contacts →
	Indirect evidence “Frank Lill and Son, Inc is your single, reliable source for turnkey power and heavy industrial plant engineering, design, installations, conversions and repairs.” Source: RevenueBase Database · checked Sep 16, 2026
23	PSI Repair Services, INC	Indirect evidence	Livonia, MI, United StatesHQ checked Sep 16, 2026	51-200	64 contacts →
	Indirect evidence “When industrial equipment fails, every minute of downtime costs you money.” Source: RevenueBase Database · checked Sep 16, 2026
24	Southern Power Systems	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 16, 2026	51-200	63 contacts →
	Indirect evidence “We service, maintain, repair, and upgrade all manufacturers' electrical equipment, including switchgear, circuit breakers, transformers, and starters.” Source: RevenueBase Database · checked Sep 16, 2026
25	Peaker Services, INC	Indirect evidence	Brighton, MI, United StatesHQ checked Sep 16, 2026	51-200	54 contacts →
	Indirect evidence “Peaker Services, Inc.(PSI) was founded in 1971 in a two-car garage in Belleville, Michigan to repair and maintain 2.5 MW EMD diesel generators or “Peakers” as they are known in…” Source: RevenueBase Database · checked Sep 16, 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: hydroelectric facility maintenance contractors. 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 hydroelectric facility maintenance contractors.
Partial evidence: Its own public description names part of hydroelectric facility maintenance contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydroelectric facility maintenance contractors. 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 229 hydroelectric facility maintenance contractors based in the United States

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Hydroelectric facility maintenance contractors based in the United States at a glance

As of Sep 16, 2026

37.8%Verified-email coverage

38.1Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 229 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 hydroelectric facility maintenance contractors, 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 “hydroelectric facility maintenance contractors”. 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 hydroelectric facility maintenance contractors), 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 hydroelectric facility maintenance contractors, 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, 3,292 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 16, 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.

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 hydroelectric facility maintenance contractors, 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 hydroelectric facility maintenance contractors are there based in the United States?

RevenueBase identified 229 hydroelectric facility maintenance contractors 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?

Power Plant Services, headquartered in Melrose Park, tops this list with the largest team on record.

Which city has the most hydroelectric facility maintenance contractors?

Houston leads with 7 headquartered companies, followed by Greenville (4) and Baldwin (3).

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 3,292 verified decision-maker contacts tracked across these 229 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 16, 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.