Solar panels in Eureka, CA
Roofs in Eureka get about 1,540 hours of usable sunlight a year — less than 51% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.
Check your specific roof in Eureka → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Eureka solar system costs
A 21-panel system (8.4 kW) is about right for an average Eureka home using 10,800 kWh a year. It would produce roughly 10,996 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,189 | $6,384 | $1,202 | 5.3 yrs |
| 12 panels | 4.8 kW | 6,283 | $9,576 | $1,336 | 7.2 yrs |
| 16 panels | 6.4 kW | 8,378 | $12,768 | $1,466 | 8.7 yrs |
| 20 panels | 8 kW | 10,472 | $15,960 | $1,597 | 10 yrs |
| 26 panels | 10.4 kW | 13,614 | $20,748 | $1,793 | 11.6 yrs |
Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.
Why Eureka gets 1,540 sun hours
That figure comes from Google's analysis of real rooftops across Eureka — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Eureka reaches about 1,556 hours, roughly 1% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,540 hrs/yr |
|---|---|
| Unshaded roof | 1,556 hrs/yr |
| Electricity rate (California avg) | 31.2¢/kWh |
| Installed cost assumed | $2.85/W |
| Panel size assumed | 400 W |
| Federal tax credit | 30% |
| Typical household usage | 10,800 kWh/yr |
| Power used as generated | 34% |
| Paid for exported power | 20% of retail |
| Rooftops sampled here | 5 |
| Google imagery from | 2022 |
When Eureka actually produces
Annual totals hide the thing that catches people out: 36% of Eureka's yearly sunlight arrives in May–July, and just 13% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 68 | |
| Feb | 92 | |
| Mar | 124 | |
| Apr | 158 | |
| May | 182 | |
| Jun | 192 | |
| Jul | 186 | |
| Aug | 167 | |
| Sep | 136 | |
| Oct | 101 | |
| Nov | 73 | |
| Dec | 61 |
Eureka produces about 3.1× as much in Jun as in Dec — a normal mid-latitude swing. Expect real winter shortfall and summer surplus rather than steady year-round output.
The annual total is measured from Google's rooftop imagery. Its split across months is calculated from solar geometry at Eureka's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Eureka compares to the other 673 cities
| Measure | Eureka | Rank of 673 |
|---|---|---|
| Usable sunlight | 1,540 hrs | 344th |
| Sunlight lost to shade | 1% | 661st most |
| Median roof size | 116 m² | 614th largest |
| Electricity rate | 31.2¢ | 69th highest |
| Payback | 10.3 yrs | 360th fastest |
| Grid carbon | 429 kg/MWh | 605th dirtiest |
What actually stands out about Eureka:
- Unusually open roofs. Only 1% of available sunlight is lost to obstruction in Eureka — better than all but 12 of the 673 cities measured. Most roofs here get close to their theoretical maximum.
- The case here is financial, not environmental. Eureka's grid is already clean at 429 kg CO₂ per MWh, so the carbon saving from solar is modest. Judge this one on payback.
- Dimmer than the rest of California. Eureka roofs get 20% less usable sunlight than the typical California city we've measured — statewide averages will overstate what you can expect here.
- Expensive electricity works in your favour. At 31.2¢/kWh, California is among the priciest places to buy power — which is exactly what makes generating your own pay back faster.
Cities with almost the same sunlight
These are the closest matches to Eureka's 1,540 usable sun hours from other states and provinces. Same sunlight, different electricity prices — which is usually what decides whether solar is worth it.
| City | Sun hrs | Rate | Payback |
|---|---|---|---|
| Norfolk, VA | 1,539 | 14.2¢ | 10.9 yrs |
| Chapel Hill, NC | 1,539 | 13.2¢ | 11.7 yrs |
| Murfreesboro, TN | 1,541 | 12.1¢ | 12.8 yrs |
| Franklin, TN | 1,539 | 12.1¢ | 12.8 yrs |
Nearby cities
See all of California → statewide sunlight, rates, incentives and every city we've measured.
Eureka solar questions
How many solar panels do I need in Eureka?
About 21 panels for an average home using 10,800 kWh a year. Eureka roofs get 1,540 usable sun hours, so each 400W panel produces roughly 524 kWh annually. A typical Eureka roof fits about 43 panels, so roof space is unlikely to be your limit.
Is solar worth it in Eureka?
At 31.2¢/kWh and 1,540 sun hours, a typical system pays for itself in about 10.3 years and returns roughly $23,982 over a 25-year panel life. That is slower than average, so compare several quotes before committing. Exports earn only 20% of retail, so using power as you generate it matters.
How much do solar panels cost in Eureka?
A 8.4 kW system costs about $23,940 before incentives and $16,758 after the 30% federal tax credit. That works out near $2.85 per watt installed. Roof pitch, shading, electrical panel upgrades and equipment choice move the price most, which is why quotes for the same house can differ by thousands.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average California electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.