Graham Porter Construction
Recently activeSolar installer based in California · installer record #40352 resolved from 157 public installation records.
At a glance
Graham Porter Construction is a solar installer with 157 recorded installations totalling 2.1 MW, dated 2011 to 2025. All of its records are in California, where it ranks 1047th of 6,010 profiled installers by volume and 1,696th of 10,537 nationally. Its median installed price for solar-only systems in 2023–2025 is $2.60/W before incentives, across 10 priced systems.
Track record
Install volume by year
Recorded installs per year; prices by year are in the table below.
Pricing
Price by year (solar only)
| Year | Priced systems | Graham Porter Construction | California median | vs state |
|---|---|---|---|---|
| 2019 | 17 | $2.59/W | $3.95/W | −34% |
| 2018 | 24 | $2.95/W | $4.01/W | −26% |
| 2017 | 27 | $2.98/W | $4.05/W | −26% |
| 2016 | 28 | $3.06/W | $4.37/W | −30% |
| 2015 | 14 | $2.80/W | $4.58/W | −39% |
Median installed price per DC watt before incentives, systems without a battery, by the year in the public record. Years with fewer than five priced systems are left out.
Why a company's own figure can differ from this one
- Timing. These prices come from state incentive filings, published about once a year, so the latest full year here is 2025. Prices moved down in many states after 2023; a company's current quotes can be lower (or higher) than its last full year on record.
- Dates. A filing is dated when the program processed it, not when the job was sold, so jobs can land in a different month or year than in the company's own books.
- What the price includes. The filed price is the whole project as reported to the program, which can include loan dealer fees, electrical panel upgrades or roof work. A company's internal figure often leaves those out.
- Batteries. Systems flagged with a battery are excluded here; a battery the filing didn't flag can still raise a year's median.
Latest records
Most recent recorded installs
| Date | Location | Size | Price | Ownership |
|---|---|---|---|---|
| Aug 20, 2025 | Atwater, CA | 16.5 kW | $36,500 | Host-owned |
| Aug 4, 2025 | Atwater, CA | — | $38,000 | Host-owned · battery |
| Jul 7, 2025 | Atwater, CA | 33 kW | $68,300 | Host-owned |
| Jun 17, 2025 | Atwater, CA | 19.8 kW | $40,900 | Host-owned |
| Jun 4, 2025 | Atwater, CA | 66 kW | $143,100 | Host-owned |
| Mar 25, 2025 | Merced, CA | — | $43,000 | Host-owned · battery |
| Oct 18, 2024 | Merced, CA | 1.8 kW | $12,000 | Host-owned |
| Jul 22, 2024 | Los Banos, CA | 5.6 kW | $15,000 | Host-owned |
| May 31, 2024 | Merced, CA | 81.7 kW | $242,000 | Host-owned |
| May 30, 2023 | Merced, CA | 20.4 kW | $72,000 | Host-owned |
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Service geography
- California
- 157
Busiest cities
Record
- Installer ID
- PC-40352
- First recorded install
- Oct 10, 2011
- Last recorded install
- Aug 20, 2025
- Priced records
- 127
Is this your company?
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How does Graham Porter Construction compare with other installers in California?
By recorded installations Graham Porter Construction ranks 1047th among the 6,010 installers based in California with five or more records. Its 2023–2025 solar-only median of $2.60/W is about 34% below the California median of $3.95/W on the same basis. Its median system, 9 kW, is about 52% above the state median of 5.9 kW. 0% of its recorded installations are third-party owned (lease or power-purchase agreement), against 29% across California. 1% include battery storage, compared with 16% of California records. Installers of similar recorded volume in California include Green Wolf Electric (157), Harmony Farm Supply (157) and Silverwood Energy (157).
How has Graham Porter Construction's installation volume changed?
Graham Porter Construction's earliest dated installation on record is from 2011. It has recorded installations in 14 calendar years. The busiest year was 2016, with 31 installations. 2025, its latest year with records, has 6. Its median price per watt moved from $4.67/W in 2011 to $2.12/W in 2025. The most recent recorded installation is dated Aug 20, 2025.
Where does Graham Porter Construction install solar?
All recorded installations are in California. The cities with the most of its installations are Atwater, CA (56), Merced, CA (51), Stockton, CA (19), Chowchilla, CA (4) and Los Banos, CA (3).
Frequently asked questions
How many solar installations has Graham Porter Construction completed?
PanelCensus records 157 installations by Graham Porter Construction, from Oct 10, 2011 to Aug 20, 2025, totalling 2.1 MW of capacity. Public reporting varies by state, so the company's true total may be higher.
What does Graham Porter Construction charge for solar?
For solar-only systems installed in 2023–2025, the median reported price is $2.60/W before incentives, across 10 priced systems. The California median on the same basis is $3.95/W. Across all 127 priced systems since 2011, including battery systems, the median is $2.93/W. Prices are the total project cost reported to state incentive programs, divided by the system's DC watts, so they can include electrical upgrades or other work billed with the solar.
Where does Graham Porter Construction install solar?
All 157 recorded installations are in California, the most of them in Atwater.
Is Graham Porter Construction still installing solar?
The most recent installation attributed to Graham Porter Construction in the public records is dated Aug 20, 2025; 2025 has 6 recorded installations. Records reach PanelCensus months to a couple of years after installation, so recent activity may not appear yet.
Does Graham Porter Construction install leased or PPA solar systems?
0 recorded installations by Graham Porter Construction (0%) are third-party owned — a lease or power-purchase agreement; across California the share is 29%.
Does Graham Porter Construction install battery storage?
2 recorded installations by Graham Porter Construction (1%) include a battery.
Related installers and places
- All solar installers in California· 6,010 profiles
- Solar installations in California· 2,408,542 records
- Green Wolf Electric· 157 installations
- Harmony Farm Supply· 157 installations
- Silverwood Energy· 157 installations
- Annex Solar Electric· 156 installations
- Devil Dog Energy· 156 installations
- Economic Energy Solutions· 156 installations
Dataset updated . Sources: LBNL Tracking the Sun + permit and program records; installer resolved by exact-normalized name matching.
About this data
Source: Lawrence Berkeley National Laboratory's Tracking the Sun, merged with city permit records, state incentive programs and the USGS U.S. Large-Scale Solar Photovoltaic Database / EIA-860 plant registers, as published September 21, 2026 — PanelCensus refreshes it as each source publishes new records. See the methodology for how records are matched, cleaned and scored.
Cite as: PanelCensus, “Graham Porter Construction, solar installer (California)”, https://panelcensus.com/installers/california/graham-porter-construction-40352 (data as of September 21, 2026).