San Diego Gas & Electric (SDG&E) serves about 3.7 million people across San Diego County and southern Orange County. SDG&E has the highest residential electricity rates of any major California utility — which makes ADU solar especially valuable here.
Every new detached ADU in SDG&E territory permitted in 2024–2026 must include a Title 24-compliant solar system. San Diego County's climate zones 7, 10, and 14 each carry their own kW factor for sizing.
SDG&E's residential rates are the highest in California — peak summer DR-SES tiers exceed $0.55/kWh. Even under NEM 3.0's reduced export rates, SDG&E ADU solar still delivers strong ROI because every kWh you self-consume offsets a very expensive utility kWh.
SDG&E uses an online PowerClerk-style application. PTO timelines run 3–5 weeks after submission. There is no interconnection fee for systems under 30 kW.
ADU solar packages in SDG&E territory range from $4,000 (Standard cash) to $15,000+ (Premium with battery). High retail rates mean payback is among the fastest in California.
Because SDG&E retail rates are the highest in California, every kWh of solar self-consumption offsets the most expensive utility power in the state.
SDG&E participates in the SGIP battery storage rebate program and equity solar programs. Most ADU projects qualify for the standard 30% federal ITC.