Company lists · Data refreshed September 2026

Top 25 Climate consulting firms based in Washington, United States

Name: Climate consulting firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 8, 2026 77 companies tracked

RevenueBase identified 77 climate consulting firms headquartered in Washington, United States as of September 2026 and tracks 799 professional contacts across them, including 424 with verified work emails and 202 with mobile numbers. New York is the largest hub.

This list covers climate consulting firms headquartered in Washington, 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 8, 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 8, 2026 86% judged on-target in blind review

77Companies

799Contacts tracked

424Verified emails

202Mobile numbers

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The 25 largest climate consulting firms based in Washington, United States

Ranked by team size

Top 25 of 77 climate consulting firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 8, 2026. RevenueBase Smart Search rates how each company's information relates to climate consulting firms: 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	Synergy Consulting, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	51-200	434 contacts →
	Partial evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 8, 2026
2	Baumann Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	51-200	63 contacts →
	Partial evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 8, 2026
3	Northbridge	Indirect evidence	Washington, United StatesHQ checked Sep 8, 2026	11-50	24 contacts →
	Indirect evidence “At Northbridge, we provide our clients with the tools and expertise to help solve complex financial, policy, and environmental challenges.” Source: RevenueBase Database · checked Sep 8, 2026
4	The Clark Group LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	19 contacts →
	Partial evidence “The Clark Group is an environmental policy consulting firm that provides a broad range of services to government, private and nonprofit clients.” Source: RevenueBase Database · checked Sep 8, 2026
5	Grid Strategies LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	17 contacts →
	Partial evidence “Grid Strategies LLC is a power sector consulting firm helping clients understand the opportunities and barriers to integrating clean energy into the electric grid.” Source: RevenueBase Database · checked Sep 8, 2026
6	Numark Associates, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 8, 2026
7	Co2efficient	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	14 contacts →
	Indirect evidence “CO2EFFICIENT LLC (COEFFICIENT) was founded in 2017 as a mission-focused Washington, D.C.” Source: RevenueBase Database · checked Sep 8, 2026
8	Sustainable YOU	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	51-200	14 contacts →
	Partial evidence “Sustainable You is a national strategic consulting firm in solar and sustainability serving residential and small commercial clients with a focus in the DC, Maryland and Virginia…” Source: RevenueBase Database · checked Sep 8, 2026
9	Blackwoods Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	14 contacts →
	Partial evidence “Blackwoods Group is an agriculture and natural resource consulting firm that provides a variety of services ranging from government relations to development and implementation of…” Source: RevenueBase Database · checked Sep 8, 2026
10	Green Strategies, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	8 contacts →
	Indirect evidence “Green Strategies Inc.” Source: RevenueBase Database · checked Sep 8, 2026
11	Center For Climate Strategies	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	8 contacts →
	Partial evidence “The Center for Climate Strategies provides high-level support for planning, analysis, and implementation of climate, energy, and economic programs in partnership with government…” Source: RevenueBase Database · checked Sep 8, 2026
12	The Climate Board	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	7 contacts →
	Partial evidence “The Climate Board builds AI-enhanced data products for corporate climate teams, closing the gap between infrequent assessments and real-time risk.” Source: RevenueBase Database · checked Sep 8, 2026
13	Adaptation Leader	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	7 contacts →
	Partial evidence “We provide services to leaders of organizations that want to plan and implement climate adaptation actions to protect and maximize their investments across their programs…” Source: RevenueBase Database · checked Sep 8, 2026
14	Partnership International, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	7 contacts →
	Partial evidence “Partnership International, Inc, founded in 1990, is an international consulting firm that provides socio-economic, regulatory, institutional, technical, commercial and financial…” Source: RevenueBase Database · checked Sep 8, 2026
15	Clima Capital Partners LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	11-50	7 contacts →
	Partial evidence “Clima Capital Partners LLC (CLIMA) advises and creates sustainable value for local economies and communities through robust climate finance solutions, managing and mitigating…” Source: RevenueBase Database · checked Sep 8, 2026
16	Green Capitol	Indirect evidence	Washington, United StatesHQ checked Sep 8, 2026	1-10	7 contacts →
	Indirect evidence “Green Capitol LLC works on sustainable development policy at the state, federal and international levels, serving clients on agriculture, energy and environment concerns via…” Source: RevenueBase Database · checked Sep 8, 2026
17	Energy Shrink, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	6 contacts →
	Partial evidence “Energy Shrink is an environmental consulting practice specialized in sustainability and energy efficiency in buildings, that is, high-performance or green buildings.” Source: RevenueBase Database · checked Sep 8, 2026
18	38 North Solutions	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	5 contacts →
	Partial evidence “38 North Solutions is a boutique consulting firm that provides a suite of business strategy and public policy services to innovative businesses and organizations.” Source: RevenueBase Database · checked Sep 8, 2026
19	Oasis Energy Partners	Strong evidence	Washington, United StatesHQ checked Sep 8, 2026	1-10	5 contacts →
	Strong evidence “OASIS Energy Partners is a full-service consulting and advisory firm at the intersection of energy, environment, and climate.” Source: RevenueBase Database · checked Sep 8, 2026
20	ALT Surya	Strong evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	5 contacts →
	Strong evidence “Alt Surya is a global climate advisory firm, which provides expert consulting services to clients in Asia and North America.” Source: RevenueBase Database · checked Sep 8, 2026
21	GQS NEW Energy Strategies	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	5 contacts →
	Indirect evidence “Our team leverages deep industry expertise to help you navigate regulatory shifts and seize new opportunities in clean energy.” Source: RevenueBase Database · checked Sep 8, 2026
22	Sustainability Frameworks	Indirect evidence	Washington, United StatesHQ checked Sep 8, 2026	1-10	4 contacts →
	Indirect evidence “Sustainability Frameworks helps its public and private sector clients develop strategies to manage their environmental and social risks and opportunities, optimize their…” Source: RevenueBase Database · checked Sep 8, 2026
23	Echo Communications Advisors	Partial evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	4 contacts →
	Partial evidence “Echo Communications Advisors is a public affairs firm specializing in clean energy, climate, and conservation policy.” Source: RevenueBase Database · checked Sep 8, 2026
24	Range Renewables	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	4 contacts →
	Indirect evidence “Range Renewable Advisors (“Range” or “Range Renewables”) is a renewable energy advisory firm focused on helping clients tackle complex financial solutions in development, project…” Source: RevenueBase Database · checked Sep 8, 2026
25	Deborah Brosnan & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 8, 2026	1-10	4 contacts →
	Indirect evidence “Leading and innovative company that finding solutions, bridging gaps and driving positive action for clients and the planet.” Source: RevenueBase Database · checked Sep 8, 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: climate consulting firms. 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 climate consulting firms.
Partial evidence: Its own public description names part of climate consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate consulting firms. 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 77 climate consulting firms based in Washington, United States

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Climate consulting firms based in Washington, United States at a glance

As of Sep 8, 2026

53.1%Verified-email coverage

25.3%Mobile-number coverage

10.4Average contacts per company

1-10Median size (employees)

141.6%Largest-city concentration · New York

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

3960–30

2831–60

061–90

090–180

0180+

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 climate consulting firms, 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 Washington, United States whose own description of what they do matches “climate consulting firms”. 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 climate consulting firms), 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 climate consulting firms, and records with no verified work email. Companies headquartered outside Washington 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, 424 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 8, 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.

Climate consulting firms by metro in the United States

Climate consulting firms in New York109
Climate consulting firms in Washington73
Climate consulting firms in Houston63
Climate consulting firms in San Francisco54
Climate consulting firms in Chicago48
Climate consulting firms in Denver48
Climate consulting firms in Seattle43

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 climate consulting firms, 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 climate consulting firms are there based in Washington, United States?

RevenueBase identified 77 climate consulting firms headquartered in Washington, 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?

Synergy Consulting, INC, headquartered in Washington, tops this list with the largest team on record.

Which city has the most climate consulting firms?

New York leads with 109 headquartered companies, followed by Washington (73) and Houston (63).

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 424 verified decision-maker contacts tracked across these 77 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 8, 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.