Energy Service Partners
Ontario, California
Year Founded: 2015
joinesp.com
Total Kilowatts Installed Since Founded: 144,730
Number of Employees: 100
Rank: 148
Since 2015 ESP has installed solar for over 21,000 homeowners in California and Texas who chose ESP to protect their pocketbook, the planet, or their homes from power outages and rate hikes.
★ 2026 Top Solar Contractors
#148
Solar kW · 2025
12,231
solar kilowatts installed
Storage kWh · 2025
15,358
storage kilowatt-hours installed
Primary Service
Installer
2025 Solar Installations by State & Territory
| State / Territory | kW Installed 2025 | |
|---|---|---|
| California | 10,444 | View state list → |
| Texas | 1,787 | View state list → |
Prior
Prior
Lists 2012 – 2025
Lists 2012 – 2025
2025
16,620
2024 Installation Data
View 2024 Installation Data by State
| California | 14,422 |
| Texas | 2,198 |
2024
20,633
2023 Installation Data
View 2023 Installation Data by State
| California | 20,633 |
2023
29,132
2022 Installation Data
View 2022 Installation Data by State
| California | 29,132 |
2022
22,275
2021 Installation Data
View 2021 Installation Data by State
| California | 22,275 |
| Nevada | 14 |
2021
22,170
2020 Installation Data
View 2020 Installation Data by State
| California | 21,439 |
| Nevada | 722 |