Company lists · Data refreshed September 2026

Top 25 Behind-the-meter energy optimization companies worldwide

RevenueBase identified 2,936 behind-the-meter energy optimization companies worldwide as of September 2026 and tracks 77,215 professional contacts across them, including 30,052 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers behind-the-meter energy optimization companies worldwide, 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. Country and city lists for behind-the-meter energy optimization companies follow the table.

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
2,936Companies
77,215Contacts tracked
30,052Verified emails
0Mobile numbers
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The 25 largest behind-the-meter energy optimization companies worldwide

Ranked by team size
Top 25 of 2,936 behind-the-meter energy optimization companies worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to behind-the-meter energy optimization 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceWindsor, United KingdomHQ checked Sep 16, 202610001+9,238 contacts →

Indirect evidence

“Taking care of things.”

Source: RevenueBase Database · checked Sep 16, 2026
2Partial evidenceWaukesha, WI, United StatesHQ checked Sep 16, 20265,001-10,0003,797 contacts →

Partial evidence

“Generac is the total energy solutions company powering a smarter world.”

Source: RevenueBase Database · checked Sep 16, 2026
3Partial evidenceMunich, GermanyHQ checked Sep 16, 20261,001-5,0002,111 contacts →

Partial evidence

“INNIO Group is a global distributed energy solutions provider that delivers reliable, flexible, transient, decentralized, modular and efficient power.”

Source: RevenueBase Database · checked Sep 16, 2026
4Partial evidenceArlington, VA, United StatesHQ checked Sep 16, 20261,001-5,0001,863 contacts →

Partial evidence

“To achieve our mission, we design, deploy, and operate the world’s most advanced modular energy storage products, comprehensive lifecycle services, and AI-enabled asset management…”

Source: RevenueBase Database · checked Sep 16, 2026
5Partial evidenceSan Ramon, CA, United StatesHQ checked Sep 16, 20261,001-5,0001,763 contacts →

Partial evidence

“At GE Digital, our focus is clear: delivering software that accelerates a new era of energy.”

Source: RevenueBase Database · checked Sep 16, 2026
6Partial evidenceMilwaukee, WI, United StatesHQ checked Sep 16, 20265,001-10,0001,709 contacts →

Partial evidence

“Rehlko is a global leader in energy resilience, delivering the solutions critical to sustain and improve life.”

Source: RevenueBase Database · checked Sep 16, 2026
7Partial evidenceFramingham, MA, United StatesHQ checked Sep 16, 20261,001-5,0001,383 contacts →

Partial evidence

“Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…”

Source: RevenueBase Database · checked Sep 16, 2026
8Partial evidenceHouston, TX, United StatesHQ checked Sep 16, 2026501-1,000906 contacts →

Partial evidence

“Sunnova Energy International Inc.(NYSE: NOVA) is an industry-leading energy services company focused on making clean energy more accessible, reliable, and affordable for…”

Source: RevenueBase Database · checked Sep 16, 2026
9Partial evidenceGlasgow, United KingdomHQ checked Sep 16, 20261,001-5,000766 contacts →

Partial evidence

“Through our range of innovative energy solutions, we are delivering the future of smart energy – working closely with private and public sector partners to decarbonise the UK…”

Source: RevenueBase Database · checked Sep 16, 2026
10Partial evidenceDurham, NC, United StatesHQ checked Sep 16, 2026501-1,000740 contacts →

Partial evidence

“PowerSecure, a Southern Company subsidiary, is a leading provider of innovative energy solutions to electric utilities and their industrial, institutional, and commercial…”

Source: RevenueBase Database · checked Sep 16, 2026
11Partial evidenceAbu Dhabi, United Arab EmiratesHQ checked Sep 16, 20261,001-5,000693 contacts →

Partial evidence

“Esyasoft is redefining the way utilities and energy providers power communities.”

Source: RevenueBase Database · checked Sep 16, 2026
12Indirect evidenceManchester, United KingdomHQ checked Sep 16, 20261,001-5,000692 contacts →

Indirect evidence

“We are Calisen.”

Source: RevenueBase Database · checked Sep 16, 2026
13Partial evidenceAlmere, NetherlandsHQ checked Sep 16, 2026501-1,000678 contacts →

Partial evidence

“With transformer substations, energy storage systems, charging stations for electric vehicles and a diverse portfolio of other products and services, Alfen has a central and…”

Source: RevenueBase Database · checked Sep 16, 2026
14Partial evidenceAarhus, DenmarkHQ checked Sep 16, 2026501-1,000646 contacts →

Partial evidence

“We are a tech-driven energy trading company that trades power and gas across +40 markets.”

Source: RevenueBase Database · checked Sep 16, 2026
15Indirect evidenceMilan, ItalyHQ checked Sep 16, 2026201-500608 contacts →

Indirect evidence

“Da dicembre 2025, abbiamo integrato EF Solare, il primo produttore fotovoltaico italiano.”

Source: RevenueBase Database · checked Sep 16, 2026
16Partial evidenceLondon, United KingdomHQ checked Sep 16, 2026501-1,000595 contacts →

Partial evidence

“Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination.”

Source: RevenueBase Database · checked Sep 16, 2026
17Partial evidenceCharlotte, NC, United StatesHQ checked Sep 16, 2026201-500539 contacts →

Partial evidence

“Palmetto is a leading clean tech company on a mission to accelerate the transition to a clean energy future.”

Source: RevenueBase Database · checked Sep 16, 2026
18Partial evidenceZoetermeer, NetherlandsHQ checked Sep 16, 2026201-500525 contacts →

Partial evidence

“De energietransitie stelt bedrijven en instellingen voor toenemende uitdagingen.”

Source: RevenueBase Database · checked Sep 16, 2026
19Partial evidenceWestborough, MA, United StatesHQ checked Sep 16, 2026201-500481 contacts →

Partial 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 16, 2026
20Partial evidenceCarmel, IN, United StatesHQ checked Sep 16, 2026201-500478 contacts →

Partial evidence

“ACES is a nationwide energy management company that helps its clients buy, sell, and manage the complexity of the U.S.”

Source: RevenueBase Database · checked Sep 16, 2026
21Partial evidenceBoulder, CO, United StatesHQ checked Sep 16, 2026501-1,000472 contacts →

Partial evidence

“Uplight is a clean energy technology company that unlocks grid capacity by activating customers and their connected devices to generate, shift, and save energy.”

Source: RevenueBase Database · checked Sep 16, 2026
22Partial evidenceGurugram, IndiaHQ checked Sep 16, 2026201-500470 contacts →

Partial evidence

“Serentica Renewables India Private Limited,(Serentica) is a is an end-to-end energy solutions company enabling large-scale heavy energy intensive industries and sector to…”

Source: RevenueBase Database · checked Sep 16, 2026
23Partial evidenceSan Diego, CA, United StatesHQ checked Sep 16, 2026201-500467 contacts →

Partial evidence

“Calpine Solutions is a retail energy provider with a robust suite of customized products, analytics, and data management solutions to turn a corporate electricity expense into a…”

Source: RevenueBase Database · checked Sep 16, 2026
24Partial evidenceAubervilliers, FranceHQ checked Sep 16, 20261,001-5,000460 contacts →

Partial evidence

“Veolia Industries Global Solutions est devenu Veolia Energie Performance depuis le 1er juin 2025.”

Source: RevenueBase Database · checked Sep 16, 2026
25Partial evidenceBangalore, IndiaHQ checked Sep 16, 2026501-1,000446 contacts →

Partial evidence

“Founded in 2004 by a passionate team of entrepreneurs with deep expertise in energy management, Elmeasure began with a bold mission: to help industries, businesses, and…”

Source: RevenueBase Database · checked Sep 16, 2026

Showing 25 of 2,936 behind-the-meter energy optimization companies worldwide

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Behind-the-meter energy optimization companies worldwide at a glance

As of Sep 16, 2026
38.9%Verified-email coverage
26.3Average contacts per company
11-50Median size (employees)
1.9%Largest-city concentration · London
Sep 16, 2026Page data refreshed

Companies by employee count

1-10
1,397
11-50
1,048
51-200
331
201-500
83
501-1,000
34
1,001-5,000
19
5,001-10,000
6
10001+
6

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 behind-the-meter energy optimization 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.
Coverage
22 countries, largest first: the United States, Germany, Brazil, the United Kingdom, Spain, the Netherlands, Australia, Canada, India, France and 12 more. Country and city lists for behind-the-meter energy optimization companies are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “behind-the-meter energy optimization 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 behind-the-meter energy optimization 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 behind-the-meter energy optimization companies, and records with no verified work email.
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, 30,052 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.

Behind-the-meter energy optimization companies by location

22 lists · largest first

Every Behind-the-meter energy optimization companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 behind-the-meter energy optimization 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 behind-the-meter energy optimization companies are there worldwide?

RevenueBase identified 2,936 behind-the-meter energy optimization companies worldwide 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?

British GAS, headquartered in Windsor, tops this list with the largest team on record.

Which country has the most behind-the-meter energy optimization companies?

The United States leads with 805 companies, followed by Germany (266) and Brazil (209). Every behind-the-meter energy optimization companies list by country and city is linked on this page.

Which city has the most behind-the-meter energy optimization companies?

London leads with 57 headquartered companies, followed by Sao Paulo (44) and Madrid (41).

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 30,052 verified decision-maker contacts tracked across these 2,936 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.