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Core Development Group

Core Development Group

Mahwah, New Jersey
Year Founded: 2012
coredevusa.com
Total Kilowatts Installed Since Founded: 870,000
Number of Employees: 50

Rank: 95

Core Development Group is a leading, independent U.S. energy company specializing in the design and construction of onsite energy, including solar, battery storage, and energy infrastructure. We empower independent power producers (IPPs), energy generators, and asset owners by providing turnkey engineering, procurement, and construction (EPC) services and expert consulting, delivering projects on-time and across borders. Our mission is simple: solving critical infrastructure challenges with safety, quality, and a vision for the new energy era. Founded in 2012, Core Development Group is headquartered in Mahwah, New Jersey.

★ 2026 Top Solar Contractors
#95
Overall Rank · 2026 List
No. 95 Solar Contractor in the United States
Solar kW · 2025
34,978
solar kilowatts installed
Storage kWh · 2025
5,015
storage kilowatt-hours installed
Primary Service
EPC
C&I
23,578
kW
Community
11,400
kW

2025 Solar Installations by State & Territory

State / Territory kW Installed 2025
California 12,900 View state list →
New Jersey 10,497 View state list →
New York 6,346 View state list →
Pennsylvania 2,895 View state list →
Colorado 2,340 View state list →
← Back to 2026 Top Solar Contractors
Prior Prior
Lists
2012 – 2025
2025
Rank #99  ·  2025 List  ·  2024 Installation Data
C&I | CS · EPC
32,117
2024 Installation Data
View 2024 Installation Data by State
California 13,680
Connecticut 5,840
New York 5,220
Pennsylvania 3,850
New Jersey 2,267
Nevada 1,260
View 2025 contractor list →
2024
Rank #84  ·  2024 List  ·  2023 Installation Data
C&I · EPC · Storage: 14,824 kWh
41,547
2023 Installation Data
View 2023 Installation Data by State
California 23,153
Ohio 13,299
Kentucky 2,414
Arizona 1,418
Nevada 1,263
View 2024 contractor list →
2023
Rank #63  ·  2023 List  ·  2022 Installation Data
C&I · EPC · Storage: 5,058 kWh
52,929
2022 Installation Data
View 2022 Installation Data by State
California 24,061
Ohio 13,299
Utah 3,532
Illinois 2,960
Kentucky 2,550
New Jersey 2,418
Nevada 1,263
Florida 1,011
New York 717
Georgia 503
Tennessee 295
Arizona 254
Alabama 64
View 2023 contractor list →
2022
Rank #75  ·  2022 List  ·  2021 Installation Data
C&I · EPC
33,566
2021 Installation Data
View 2021 Installation Data by State
California 21,234
New York 8,535
New Jersey 2,883
Washington D.C. 914
View 2022 contractor list →
2021
Rank #127  ·  2021 List  ·  2020 Installation Data
C&I · Developer
10,845
2020 Installation Data
View 2020 Installation Data by State
New Jersey 5,569
Illinois 2,484
California 2,068
New York 724
View 2021 contractor list →
2020
Rank #65  ·  2020 List  ·  2019 Installation Data
Commercial · Developer
31,398
2019 Installation Data
View 2019 Installation Data by State
California 17,176
Colorado 7,550
New Jersey 5,160
Connecticut 1,512
View 2020 contractor list →
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    • Most Recent Posts
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      • Latest News Items
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      • IRA/OBBBA coverage
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      • Latest Feature Stories
      • Benchmarking U.S. Solar Manufacturing
      • SPW’s Rising Stars
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