Company lists · Data refreshed September 2026

Top 21 Renewable energy consultancy companies based in Chicago, United States

Name: Renewable energy consultancy companies based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 45 companies tracked

RevenueBase identified 45 renewable energy consultancy companies headquartered in Chicago, United States as of September 2026 and tracks 332 professional contacts across them, including 109 with verified work emails. Houston is the largest hub.

This list covers renewable energy consultancy companies headquartered in Chicago, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

45Companies

332Contacts tracked

109Verified emails

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The 21 largest renewable energy consultancy companies based in Chicago, United States

Ranked by team size

Top 21 of 45 renewable energy consultancy companies based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names renewable energy consultancy companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Carbon Solutions GroupIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	42
	“Carbon Solutions Group was founded in Chicago, Illinois, in 2006.” Source: company website · checked Sep 5, 2026
2	NEW Generation PowerIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	32
	“Our vision is to provide clean, reliable power to international markets, to meet rapidly rising demand through efficient, locally appropriate technologies.” Source: company website · checked Sep 5, 2026
3	National Retrofitting Group, LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	30
	“National Retrofitting Group provides sustainability consulting along with a variety of energy retrofitting services to help our customers save money on their energy bills while…” Source: company website · checked Sep 5, 2026
4	Windfree SolarPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	22
	“Windfree Wind and Solar Energy Company was founded early in 2009 by a team of creative energy visionaries and early adopters of sustainable technologies.” Source: company website · checked Sep 5, 2026
5	Envision MarketingIndirect evidence	Chicago, United StatesHQ checked Sep 5, 2026	11-50	18
	“Envision Marketing was created in of one of the oldest deregulated states in the US, Illinois.” Source: company website · checked Sep 5, 2026
6	Elcora SolutionsPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	17
	“Elcora Engineering Solutions stands tall as a trailblazer in the energy sector.” Source: company website · checked Sep 5, 2026
7	Carlson Environmental, A Nova Group, GBC CompanyIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	17
	“Carlson Environmental, a Nova Group, GBC Company, was originally founded in 1988 by Dr.” Source: company website · checked Sep 5, 2026
8	360 Energy GroupPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	16
	“360 Energy Group is an energy consulting firm that provides comprehensive energy solutions to the public and private sectors in the United States and worldwide, including energy…” Source: company website · checked Sep 5, 2026
9	EconergyStrong evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	11
	“Renewable energy development, financing, and energy portfolio management.” Source: company website · checked Sep 5, 2026
10	Inova Energy GroupPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	7
	“Inova Energy Group is a certified WBE offering management consulting, strategic planning, and project delivery solutions in the areas of energy and sustainability.” Source: company website · checked Sep 5, 2026
11	The Astor CompanyIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	7
	“The Astor Company opened its doors almost 20 years ago as a cardboard recycling company, beginning a journey of continuous adaptation and evolution which today finds a world-class…” Source: company website · checked Sep 5, 2026
12	E4, LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	5
	“E4 LLC is a trusted advisor to C&I and municipal clients navigating the evolving clean energy landscape.” Source: company website · checked Sep 5, 2026
13	ALL In Resources AIRPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	4
	“All In Resources offers services and advice to investors, vendors and enterprises related to energy and environmental sustainability.” Source: company website · checked Sep 5, 2026
14	Atlas Resource GroupPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	3
	“Atlas Resource Group helps property owners monetize the value of their land or business by providing them with renewable opportunities.” Source: company website · checked Sep 5, 2026
15	Reenergy Solutions LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	2
	“ReEnergy Solutions is dedicated to the advancement of clean energy through the development and management of hydrogen refueling stations and production plants.” Source: company website · checked Sep 5, 2026
16	Enovation PartnersPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	1
	“The energy industry is changing Enovation Partners provides energy, utility and infrastructure clients with the technical, regulatory, strategic and operational experience…” Source: company website · checked Sep 5, 2026
17	Marsim Energy LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	11-50	1
	“We provide engineering, consulting, and technical advisory services to support assets owners, developers, contractors, and investors on various energy projects.” Source: company website · checked Sep 5, 2026
18	SoleonPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	1
	“Here at Soleon we are dedicated in guiding our clients towards the optimal solar energy solution.” Source: company website · checked Sep 5, 2026
19	Cadenza Environmental LLCIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	1
	“Environmental Engineering and Consulting Services” Source: company website · checked Sep 5, 2026
20	Renewable Asset Partners LLCIndirect evidence	Chicago, United StatesHQ checked Sep 5, 2026	1-10	1
	“Our professional services firm is dedicated to elevating wind and solar investments and operations across the globe.” Source: company website · checked Sep 5, 2026
21	Constructive Approaches, LLCIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1-10	1
	“Constructive Approaches is a consulting firm focused on helping clients make informed choices that minimize environmental impact in construction projects and business operations.” Source: company website · checked Sep 5, 2026

Showing 21 of 45 renewable energy consultancy companies based in Chicago, United States

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Renewable energy consultancy companies based in Chicago, United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

HoustonLargest hub · 115 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 45 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 renewable energy consultancy companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Chicago, United States whose own description of what they do matches “renewable energy consultancy companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among renewable energy consultancy companies, and records with no verified work email. Companies headquartered outside Chicago 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 an evidence 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, 109 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 5, 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.

Renewable energy consultancy companies by metro in the United States

Frequently asked

How many renewable energy consultancy companies are there based in Chicago, United States?

RevenueBase identified 45 renewable energy consultancy companies headquartered in Chicago, 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?

Carbon Solutions Group, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most renewable energy consultancy companies?

Houston leads with 115 headquartered companies, followed by New York (83) and Denver (53).

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 109 verified decision-maker contacts tracked across these 45 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 5, 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 SmartSearch, 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.