Solar Energy in Contra Costa County, California
Very Good Solar Resource
0.2 kWh/m²/day above US average
Contra Costa County, California receives an average of 5.8 peak sun hours daily, with average solar irradiance of 5.0 kWh/m²/day. This makes it a very good location for solar solar installations.
Solar Data Summary
Solar irradiance vs. US average (4.8 kWh/m²/day)
5.0 kWh/m²/day
0
US avg ▲ 69%
7.0
System & Location Details
- Country
- United States
Frequently Asked Questions — Contra Costa County, California
Contra Costa County receives an average solar irradiance of 5.0 kWh/m²/day, which is 0.2 kWh/m²/day above the US national average of 4.8 kWh/m²/day. This places Contra Costa County’s solar resource in the “Very Good” category.
Contra Costa County is rated “very good” for residential solar, receiving 5.8 peak sun hours per day. This exceeds the threshold for cost-effective solar across most financing scenarios. Local utility rates, net metering policy, and available incentives also significantly affect the economics of a solar installation.
Contra Costa County averages 5.8 peak sun hours per day. Peak sun hours represent the equivalent number of hours when solar irradiance equals 1,000 W/m² — the standard used to rate solar panel output. Seasonal variation means winter months may see 30–40% less production than peak summer months.
Contra Costa County has an irradiance of 5.0 kWh/m²/day, rated “very good” solar resources. Browse other profiles in California to compare locations. Geographic variation within states can be significant — coastal, desert, and mountain regions often show markedly different solar potential.
Key Solar Terms for This Analysis
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