The national average retail electricity rate in the United States reached approximately $0.16–$0.18 per kilowatt-hour in 2026, with significant variation by state — ranging from $0.10/kWh in states like Louisiana and Oklahoma to $0.30–$0.40/kWh in Hawaii and parts of New England. Solar panels, meanwhile, produce electricity at what's called a levelized cost of energy (LCOE) — the total system cost divided by all the energy it produces over its lifetime. For most residential solar installations in the US today, that works out to $0.06–$0.10 per kWh over the 25–30 year lifespan of the system.

Breaking Down the Real Cost of Solar Per kWh

• How LCOE Is Calculated

  Take a $20,000 system (before incentives), subtract the $6,000 federal tax credit to get $14,000 net cost. A 6 kW system in a moderate-sun location produces roughly 8,000–9,000 kWh per year. Over 25 years, that's 200,000–225,000 kWh. Divide $14,000 by 210,000 kWh and you get approximately $0.067 per kWh — less than half the national grid average.

• The Advantage Grows Over Time

  Your solar LCOE is essentially fixed — the system is paid off and produces electricity for near zero variable cost. Grid electricity rates have risen an average of 3% per year historically. At that rate, a household currently paying $0.17/kWh will be paying $0.23/kWh in 10 years and $0.31/kWh in 20 years. Your solar panels don't change their rate.

• Where Solar Beats Grid Power Most Decisively

  States with high electricity rates see the most dramatic cost advantage from solar. In California, Massachusetts, New York, Connecticut, and Hawaii, grid rates are high enough that solar LCOE can be less than one-third of the grid rate, producing very fast payback periods and exceptional lifetime savings.

• States Where the Math Is Tighter

  In states with very low electricity rates (under $0.10/kWh), the cost difference between solar LCOE and grid power narrows significantly. Going solar still often makes financial sense over a 25-year horizon, but the payback period stretches to 12–15 years, and the lifetime savings are less dramatic.

How you pay for solar significantly affects the cost comparison. Paying cash produces the best long-term economics — your LCOE calculation is as described above. Solar loans add interest costs that raise the effective LCOE, but for loans with interest rates under 5%, solar still compares favorably to grid power in most states. Solar leases and PPAs (power purchase agreements) let you go solar with zero upfront cost, but you typically pay a rate per kWh to the solar company rather than owning the system. Lease rates are usually set below current grid rates but may escalate 1–3% per year.

The key insight across all financing scenarios is that the cost of solar electricity is predictable and largely fixed, while grid electricity rates are subject to ongoing increases. The value of locking in a stable, below-market electricity rate for 25+ years becomes more apparent with each passing year of grid rate increases — which is why the financial case for going solar tends to improve the longer you wait to look at it in hindsight.

There's also a home value dimension worth factoring into the comparison. Homes with solar sell for a meaningful premium over comparable homes without it. If you sell your home eight years after going solar and receive $18,000 more for it as a result of the panels, that value effectively adds to the return you've already earned through electricity savings. Viewed this way, solar isn't just a utility cost reduction — it's an investment in your property that pays dividends both while you live there and at the time of sale. That dual return profile is what makes solar one of the most financially compelling home improvement decisions available to American homeowners in 2026.