A state average is a reasonable starting point. For some metros, it's meaningfully off — and knowing which way it's off matters for your budget.
Utility service territory, not state lines, often sets your rate
Electricity rates are set by utility, and many states have multiple utilities with genuinely different rates serving different regions. Sacramento's municipal utility (SMUD) has historically priced meaningfully differently than PG&E, which serves much of the rest of Northern California — two California residents can have quite different electricity costs despite living in the same state.
San Diego is the clearest example
San Diego Gas & Electric has consistently posted among the highest residential electricity rates in the country — noticeably higher than a simple California state average would suggest. That also means solar payback in San Diego specifically tends to be faster than the state average implies, since a higher rate makes every kWh of solar production worth more.
Local sun hours can differ from state averages too
Elevation, microclimate, and coastal fog patterns all affect actual sun hours at a specific location, sometimes independent of general state climate. Denver's elevation gives it strong sun exposure that can outperform a simple Colorado state average; coastal California cities dealing with marine layer fog can underperform a broader state figure.
Check your specific metro before budgeting
We've built city-specific cost breakdowns for major U.S. metros — see your city's page if it's covered, starting from San Diego, Sacramento, or browse the full list linked from each state page. If your specific city isn't covered yet, the state-level page remains the best available estimate, and your actual utility bill is always the most accurate source for your real rate.
Frequently asked questions
Why would two cities in the same state have different solar costs?
Different utilities serving different parts of a state can have meaningfully different rates and local installation costs, and local sun exposure can vary with elevation, coastal influence, and microclimate independent of the broader state average.
Should I trust a city-level estimate over my own utility bill?
No — a city-level estimate is a useful planning starting point, but your actual utility bill's current rate is always the more accurate number for a final budgeting decision.