Solar panels in San Diego, CA: cost and payback (2026)
Solar panels in San Diego cost about $26,400 installed for an 8 kW system, and $26,400 net. There is no federal homeowner credit in that figure — the 30% credit ended for systems placed in service after December 31, 2025. At 31.8¢ per kWh that system offsets roughly $340 a month and pays itself back in 6.5 years — assuming San Diego Gas & Electric, which serves most of San Diego, credits what you export.
Cost, rate and sun hours are California statewide figures from EIA and NREL — we do not publish a separate San Diego rate or sun-hour value we cannot source. The utility is the part that is genuinely local, and it is the part that changes the answer most. Incentives are modelled for today’s date, so nothing expired is counted.
San Diego Gas & Electric: what it means for solar in San Diego
San Diego Gas & Electric serves most of San Diego. It is investor-owned utility — regulated by the state public utility commission, so the statewide net metering or net billing rule below is the one that applies to you, and any change to it goes through a public docket you can read.
Because San Diego Gas & Electric answers to the state commission, the California rule is the one that governs your exports: California moved to NEM 3.0 net billing in 2023, which pays roughly 75% less for exported power — solar there now pays best when paired with a battery and heavy self-consumption.
Whichever it is, this is the first question to settle and the one installers are least specific about. Ask for the rider or tariff name, the per-kWh export credit, how long that credit is locked for, and the current interconnection turnaround — in the written quote, not in conversation. Service territories cut across city limits, so confirm against the name at the top of your own bill.
Cost by system size in San Diego
Within one city, quotes still spread. A steep or cut-up roof costs more in labour than a simple south-facing plane. A main service panel at capacity adds a four-figure upgrade before a single module goes up. Two storeys costs more than one. None of that shows up in a per-watt average, which is why the table below is a starting point rather than a quote.
| System | Panels | Gross cost | Net cost | Yr 1 savings | Payback |
|---|---|---|---|---|---|
| 6 kW | 15 | $19,800 | $19,800 | $3,064 | 6.5 yrs |
| 8 kW | 20 | $26,400 | $26,400 | $4,086 | 6.5 yrs |
| 10 kW | 25 | $33,000 | $33,000 | $5,107 | 6.5 yrs |
Modelled, not quoted. Production is system size × 5.5 peak sun hours × 365 days × 0.8 for inverter, wiring, soiling and heat losses. Savings value that production at 31.8¢ per kWh and hold the rate flat for year one. Panel count assumes 400 W modules. Your roof, your shade and your usage move all of it.
No federal credit is in these numbers. The 30% homeowner credit (IRC Sec. 25D) ended for systems placed in service after December 31, 2025. Net cost above is gross cost minus whatever state or local money is still open — nothing else. If a quote knocks 30% off and calls it a federal credit, ask which statute they are citing.
Permits and approvals in San Diego
Two approvals, two bodies. The San Diego building department issues the electrical and structural permit. San Diego Gas & Electric issues permission to operate once the work is inspected and, where required, the meter is swapped. Nothing generates a single legal kWh until the second one lands, and the two queues do not move at the same speed.
Permit fees and turnaround vary by jurisdiction and we do not track them, so we are not going to print a number we cannot source. Make the installer put the permit cost and the expected wait for both approvals in the written quote instead of leaving them as a line you discover afterwards.
Incentives and the full state picture: solar panels in California.
Questions from San Diego
How much do solar panels cost in San Diego?
A 8 kW system in San Diego models at $26,400 installed and $26,400 net, at the California average of $3.30 per watt. There is no federal homeowner credit in that — the 30% credit ended for property placed in service after December 31, 2025. Quotes inside one city still vary by several thousand dollars depending on roof pitch, panel choice and whether the main service panel needs upgrading.
Who is the electric utility in San Diego?
San Diego Gas & Electric serves most of San Diego. It is investor-owned utility — regulated by the state public utility commission, so the statewide net metering or net billing rule below is the one that applies to you, and any change to it goes through a public docket you can read. That matters more than it sounds: your utility, not your installer and not the state, sets what an exported kWh is worth and how long permission to operate takes. Service territories cut across city limits, so check the name at the top of your own bill.
Does San Diego Gas & Electric pay for solar you send back to the grid?
San Diego Gas & Electric is an investor-owned utility, so the California rule applies to it: California moved to NEM 3.0 net billing in 2023, which pays roughly 75% less for exported power — solar there now pays best when paired with a battery and heavy self-consumption. Ask for the specific rider name and the credit rate in writing before you sign — it is a tariff, and tariffs get refiled.
Is solar still worth it in San Diego now the federal tax credit is gone?
On these numbers it pays back in about 6.5 years with no federal credit at all — $26,400 net against roughly $4,086 of electricity offset a year. California runs no state rebate either, so $26,400 is the whole price. What decides it in San Diego is the 31.8¢ per kWh you pay now and what San Diego Gas & Electric credits your exports at, not the subsidy that ended.
Does shade in San Diego kill the numbers?
Heavy shade does, and no amount of panel technology fixes it. Partial afternoon shade usually costs a modest percentage of production, which the modelling above does not attempt to guess at. If mature trees cover the south face of your roof for most of the day, the honest answer is not to bother.
Where to look next
Incentives, electricity rates, net metering rules and the full California picture live on the state page: solar panels in California.