Company lists · Data refreshed October 2026

Top 15 Commercial solar engineering firms based in St. Louis, United States

Name: Commercial solar engineering firms based in St. Louis, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 10, 2026 29 companies tracked

RevenueBase identified 29 company matches for commercial solar engineering firms associated with St. Louis, United States as of October 2026 and tracks 1,059 professional contacts across them, including 477 with verified work emails. Across the United States, New York is the largest hub for this category (147 companies); St. Louis has 29.

This list covers company matches for commercial solar engineering firms associated with St. Louis, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 10, 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 RevenueBase SmartSearch · Exact Recorded Oct 10, 2026 How this list was built

29Companies

1,059Contacts tracked

477Verified emails

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The 15 largest commercial solar engineering firms based in St. Louis, United States

Ranked by team size

Top 15 of 29 company matches for commercial solar engineering firms based in St. Louis, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 10, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Zodiac	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	n/a	230 contacts →
	Exact match “Zodiac, Inc.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
2	Trileaf Corporation	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	201-500	226 contacts →
	Exact match “Quality work and quick responses - Trileaf gives you both.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
3	Mcclure Engineering-St. Louis MEP	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	51-200	137 contacts →
	Exact match “McClure Engineering is a Mechanical and Electrical Consulting Engineering firm dedicated to the development of innovative solutions for the unique engineering needs of our clients.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
4	CDG Engineers, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	51-200	114 contacts →
	Exact match “CDG Engineers is a full service, multi-discipline professional services organization with capabilities in civil, structural, electrical and mechanical engineering, as well as…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
5	Villa Lighting Supply, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	51-200	92 contacts →
	Exact match “Whether you’re constructing new buildings, or need to retrofit your current locations, Villa Lighting will help you find a solution that increases your business sales while saving…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
6	Straightup Solar	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	51-200	83 contacts →
	Exact match “With twenty years of experience, we simplify solar solutions for residential, commercial, and industrial customers.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
7	Solutions AEC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	11-50	29 contacts →
	Exact match “Solutions AEC is a full-service Mechanical, Plumbing, Electrical Engineering and Commissioning design and construction company with offices in St.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
8	Architectural Design Guild	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	11-50	22 contacts →
	Exact match “Architectural Design Guild was founded in 1981 as a multi-disciplinary firm providing architecture, engineering (mechanical, electrical, plumbing), and interior design.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
9	EFS Energy	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	11-50	20 contacts →
	Exact match “As the premier solar panel installation experts in St.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
10	Azimuth Renewables	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	1-10	12 contacts →
	Exact match “Azimuth Renewables is a full-service solar energy development company located in the heart of the Midwest.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
11	PCS Energy	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	11-50	9 contacts →
	Exact match “PCS is a licensed electrical contractor focusing on energy efficiency solutions for commercial and industrial customers.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
12	Ecocentrix	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	1-10	6 contacts →
	Exact match “Residential and commercial solar engineering, procurement and construction (EPC) company that specializes in building energy efficiency.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
13	Freedom Solar Group	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	51-200	2 contacts →
	Exact match “Freedom Solar LLC is a premier solar design and installation company now serving Missouri customers.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
14	Alkemeyer & Associates, LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	1-10	2 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
15	Rabco Solutions, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	11-50	1 contacts →
	Exact match “Rabco Energy Solutions is an experienced, Solar Thermal engineering, cogeneration, systems integration and installation company backed by many years of experience.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “commercial solar engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 15 of 29 commercial solar engineering firms based in St. Louis, United States

See the full list, filter by size, metro and specialty, and access 477 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Commercial solar engineering firms based in St. Louis, United States at a glance

As of Oct 10, 2026

45.0%Verified-email coverage

36.5Average contacts per company

11-50Median size (employees)

Oct 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for St. Louis, so it is reported there. Company counts and contact totals on this page are exact for St. Louis, over 29 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with St. Louis, United States whose business descriptions match “commercial solar engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 477 professional contacts with verified work emails across the full matched dataset. 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 October 10, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Commercial solar engineering firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “commercial solar engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many commercial solar engineering firms are there based in St. Louis, United States?

RevenueBase identified 29 company matches for commercial solar engineering firms associated with St. Louis, United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Zodiac tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most commercial solar engineering firms?

New York leads the United States with 147 company records, followed by Houston (134) and San Diego (132). St. Louis has 29.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 477 professional contacts with verified work emails tracked across these 29 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 10, 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.