The Numbers
What Solar Costs in San Diego
San Diego gets 266 sunny days per year, and SDG&E has some of the highest electricity rates in the country ($0.46–$0.55/kWh average) — which is why solar payback periods here, now typically 9–17 years since the 30% residential credit ended, are still among the shorter ones in the country. If you're comparing the ESA above against buying a system outright, these are the purchase ranges.
| Home Size | System Cost to Buy Outright |
| Small home (<1,500 sq ft) | $12,000 – $22,000 |
| Average home (1,500–2,500 sq ft) | $18,000 – $35,000 |
| Large home (2,500+ sq ft) | $28,000 – $55,000 |
| Battery storage add-on | $8,000 – $16,000 |
About the 30% federal tax credit: the residential credit (IRS Section 25D) applied to systems placed in service through December 31, 2025. Per the IRS, “the credit is not available for any property placed in service after December 31, 2025.” So a system you buy outright today does not earn you that credit — which is exactly why the ESA above matters: under it the financing bank claims a credit it is still eligible for and passes the benefit through, so you do not need the tax liability yourself. We are not tax advisors; confirm your own situation with yours.
NEM 3.0, honestly: SDG&E switched to Net Energy Metering 3.0 in April 2023, and export rates dropped significantly. Solar remains a strong investment in San Diego because of the high electricity rates — but battery storage has become far more valuable: store your own power instead of selling it back at low rates. What drives your quote: system size (matched to your SDG&E bill), panel brand (budget $0.80–$1.20/W vs. premium $1.50–$2.50/W), roof condition and orientation — south-facing, unshaded roofs produce maximum output here — and HOA placement rules (California law limits outright HOA solar bans).