Company lists · Data refreshed September 2026

Top 25 Energy infrastructure law firms based in Washington, United States

Name: Energy infrastructure law 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 28, 2026 63 companies tracked

RevenueBase identified 63 energy infrastructure law firms headquartered in Washington, United States as of September 2026 and tracks 7,888 professional contacts across them, including 5,472 with verified work emails. Across the United States, Houston is the largest hub for this category (152 companies); Washington has 63.

This list covers energy infrastructure law 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 28, 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 28, 2026 86% judged on-target in blind review

63Companies

7,888Contacts tracked

5,472Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest energy infrastructure law firms based in Washington, United States

Ranked by team size

Top 25 of 63 energy infrastructure law firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to energy infrastructure law 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	Arnold & Porter	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,333 contacts →
	Indirect evidence “Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues.” Source: RevenueBase Database · checked Sep 28, 2026
2	Venable LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,790 contacts →
	Partial evidence “Committed to Your Success – As a law firm of more than 900 professionals, Venable delivers legal services globally in every area of regulatory compliance, government affairs…” Source: RevenueBase Database · checked Sep 28, 2026
3	Hunton Andrews Kurth LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,297 contacts →
	Indirect evidence “For 125 years, Hunton has served clients across the globe with a collaborative and purposeful approach.” Source: RevenueBase Database · checked Sep 28, 2026
4	Wiley Rein LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	501-1,000	576 contacts →
	Indirect evidence “Founded in 1983, Wiley is a dominant presence in the nation’s capital.” Source: RevenueBase Database · checked Sep 28, 2026
5	Synergy Consulting, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	434 contacts →
	Indirect evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 28, 2026
6	Beveridge & Diamond PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	201-500	328 contacts →
	Indirect evidence “Beveridge & Diamond’s 170+ lawyers in 7 U.S.” Source: RevenueBase Database · checked Sep 28, 2026
7	Keller And Heckman LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	230 contacts →
	Partial evidence “Keller and Heckman, founded in 1962, has a broad practice in the areas of regulatory law, public policy, and litigation, serving both domestic and international clients.” Source: RevenueBase Database · checked Sep 28, 2026
8	VAN Ness Feldman LLP	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	174 contacts →
	Strong evidence “Van Ness Feldman is a nationally recognized mid-sized law firm specializing in the areas of energy, environment, and natural resources law and policy, with offices in Washington…” Source: RevenueBase Database · checked Sep 28, 2026
9	Astris Finance, LLC	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	74 contacts →
	Strong evidence “Founded in Astris Finance, a Colliers company, is an independent financial advisory firm specialized in the Infrastructure and Energy (I&E) sectors with an exceptional track…” Source: RevenueBase Database · checked Sep 28, 2026
10	Reno & Cavanaugh, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	73 contacts →
	Partial evidence “Since 1977, Reno & Cavanaugh has been a national law firm dedicated to strengthening communities through strategic use of public and private resources.” Source: RevenueBase Database · checked Sep 28, 2026
11	Pilieromazza Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	70 contacts →
	Partial evidence “PilieroMazza – a business law firm – serves as a strategic partner to government contractors and commercial businesses from across the United States in numerous industries.” Source: RevenueBase Database · checked Sep 28, 2026
12	John & Hengerer LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	n/a	46 contacts →
	Partial evidence “John & Hengerer LLP represents and advises energy companies, inlcuding natural gas producers, importers, processors, and marketers; gas and liquids pipeline operators; gas storage…” Source: RevenueBase Database · checked Sep 28, 2026
13	Peacock Keller, LLP	Partial evidence	Washington, PA, United StatesHQ checked Sep 28, 2026	51-200	38 contacts →
	Partial evidence “Peacock Keller is a full service law firm headquartered in Washington, Pennsylvania.” Source: RevenueBase Database · checked Sep 28, 2026
14	Tiber Hudson LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	36 contacts →
	Partial evidence “Tiber Hudson LLC is a boutique law firm focused in providing legal services including complex commercial litigation, complex commercial transactions, corporate structure and…” Source: RevenueBase Database · checked Sep 28, 2026
15	Wright & Talisman, P.C	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	35 contacts →
	Partial evidence “For over 70 years, Wright & Talisman has been a steady partner with energy companies helping them navigate the complexities of the Federal Energy Regulatory Commission (FERC) and…” Source: RevenueBase Database · checked Sep 28, 2026
16	Spiegel & Mcdiarmid LLP	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	29 contacts →
	Strong evidence “Spiegel & McDiarmid LLP was formed to represent the public side of our nation’s critical infrastructure industries, including energy, telecommunications and transportation.” Source: RevenueBase Database · checked Sep 28, 2026
17	Duncan, Weinberg, Genzer & Pembroke, P.C. Dwgp	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	28 contacts →
	Indirect evidence “Since its founding in 1971, DWG & P, has provided a broad range of counseling, regulatory, litigation and legislative services to clients in every region of the country.” Source: RevenueBase Database · checked Sep 28, 2026
18	ARBO	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “Our mission is to transform and translate regulatory data and actions into business intelligence that drives development and commercial decisions to help American industry sustain…” Source: RevenueBase Database · checked Sep 28, 2026
19	Amis Patel Brewer	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	18 contacts →
	Strong evidence “Amis, Patel & Brewer, LLP is a boutique law firm focused on providing legal services to the renewable energy and sustainability sectors.” Source: RevenueBase Database · checked Sep 28, 2026
20	E&w LAW	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	18 contacts →
	Indirect evidence “At Earth & Water, we are more than lawyers – we’re strategic advisors with unique experience who advance our clients’ interests across a broad range of environmental and business…” Source: RevenueBase Database · checked Sep 28, 2026
21	Harkins Cunningham LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	18 contacts →
	Partial evidence “Harkins Cunningham LLP is a law firm engaged in optimizing risk and opportunities in complex matters in highly regulated and politicized environments.” Source: RevenueBase Database · checked Sep 28, 2026
22	Grid Strategies LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
23	Asmar, Schor & Mckenna, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “The attorneys of Asmar, Schor & McKenna are recognized leaders in all areas of construction law, commercial real estate transactions and commercial leasing.” Source: RevenueBase Database · checked Sep 28, 2026
24	Rock Creek Energy Group, LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “Rock Creek Energy Group is a group of diverse and like-minded professionals with a shared passion – Energy.” Source: RevenueBase Database · checked Sep 28, 2026
25	Slover & Loftus, LLP	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	16 contacts →
	Strong evidence “Slover & Loftus, LLP is a national law firm founded in 1967 and specializing in commercial transactions, litigation and arbitration in the fields of energy, transportation and…” Source: RevenueBase Database · checked Sep 28, 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: energy infrastructure law 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 energy infrastructure law firms.
Partial evidence: Its own public description names part of energy infrastructure law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy infrastructure law 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 63 energy infrastructure law firms based in Washington, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 5,472 reachable decision-makers.

Free signup · no credit card

View the full list →

Energy infrastructure law firms based in Washington, United States at a glance

As of Sep 28, 2026

69.4%Verified-email coverage

125.2Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 63 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 energy infrastructure law 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 “energy infrastructure law 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 energy infrastructure law 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 energy infrastructure law 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, 5,472 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 28, 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.

Energy infrastructure law firms by metro in the United States

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 energy infrastructure law 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 energy infrastructure law firms are there based in Washington, United States?

RevenueBase identified 63 energy infrastructure law 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?

Arnold & Porter, headquartered in Washington, tops this list with the largest team on record.

Which city in the United States has the most energy infrastructure law firms?

Houston leads the United States with 152 headquartered companies, followed by New York (67) and Washington (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 5,472 verified decision-maker contacts tracked across these 63 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 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 63 energy infrastructure law firms based in Washington, United States. Start with a free account, no credit card.

Download this list →

Related lists

Energy infrastructure law firms by geography

Browse the directory

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.