Company lists · Data verified August 2026

Top 25 Energy efficiency investment firms based in the United States

Name: Energy efficiency investment firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 674 companies tracked

There are 674 energy efficiency investment firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 8,649 professional contacts across them, including 3,492 with verified work emails and 3,628 with mobile numbers. New York is the largest hub.

This list covers energy efficiency investment firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

674Companies

8,649Contacts tracked

3,492Verified emails

3,628Mobile numbers

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The 25 largest energy efficiency investment firms based in the United States

Ranked by team size

Top 25 of 674 energy efficiency investment firms based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Noresco	Westminster, CO	201-500	484	249
2	Budderfly	Shelton, CT	201-500	359	282
3	Lime Energy	Newark, NJ	201-500	233	53
4	Dalkia Energy Solutions	Beverly, MA	201-500	212	67
5	Bright Power	New York, NY	51-200	200	135
6	Energy Management Collaborative EMC	Minneapolis, MN	201-500	197	132
7	HASI	New York, NY	51-200	194	151
8	Renew Financial	Oakland, CA	51-200	189	66
9	RISE	Cranston, RI	201-500	151	57
10	Energy Impact Partners	San Francisco, CA	51-200	135	100
11	Synergy Companies	Fresno, CA	501-1,000	124	31
12	ECP Energy Capital Partners	New York City, NY	51-200	123	82
13	Michaels Energy- An Inc. 5000 Company	La Crosse, WI	51-200	120	7
14	Erus Energy	Phoenix, AZ	51-200	118	14
15	PSD	Ithaca, NY	51-200	114	54
16	Cleancapital	New York, NY	51-200	103	73
17	Pacific Energy Concepts PEC	Chicago, IL	51-200	84	69
18	Codegreen	New York, NY	51-200	71	43
19	Thomaslloyd Group	New York, NY	1,001-5,000	65	43
20	Future Energy Solutions	Fort Lauderdale, FL	51-200	61	15
21	Energy 350, INC	Portland, OR	51-200	60	54
22	Partner Energy	Los Angeles, CA	51-200	56	41
23	FCI Management	Atlanta, GA	51-200	53	10
24	MAYER	Plano, TX	51-200	52	17
25	ECM Holding Group, INC	Oshkosh, WI	201-500	50	30

Showing 25 of 674 energy efficiency investment firms based in the United States

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Energy efficiency investment firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 41 HQs

3,628Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

366

11-50

227

51-200

201-500

501-1,000

1,001-5,000

Energy efficiency investment firms by metro

Metro	Companies
Energy efficiency investment firms in New York	41
Energy efficiency investment firms in Houston	25
Energy efficiency investment firms in San Francisco	18
Energy efficiency investment firms in Chicago	17
Energy efficiency investment firms in Los Angeles	12
Energy efficiency investment firms in Washington	12
Energy efficiency investment firms in Atlanta	12
Energy efficiency investment firms in Dallas	11

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “energy efficiency investment firms”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many energy efficiency investment firms are there based in the United States?

There are 674 energy efficiency investment firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Noresco, headquartered in Westminster, tops this list with the largest team on record.

Which city has the most energy efficiency investment firms?

New York leads with 41 headquartered companies, followed by Houston (25) and San Francisco (18).

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 3,492 verified decision-maker contacts tracked across these 674 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Energy efficiency investment firms by geography

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.