El Cajon solar: the lightest permit we cover meets the heaviest rates

No city inspector will visit. Read that again.

In most California cities the inspection is where solar timelines go to die. El Cajon removed the step: the applicant completes a third party inspection declaration, uploads it to PACO under ATTACHMENTS, and requests a Final Review that releases the system to SDG&E. The City states no other City inspections are required. For a contractor, that eliminates the scheduling dance entirely. For a homeowner, it moves the quality burden onto the third party inspection and your own contract terms.

Our operator take: when a city outsources inspection, your contract is the inspection. Get the third party inspection named in the scope, ask who employs the inspector, and hold retainage or the final payment until the declaration and SDG&E release both exist. None of that is required by the City. All of it is cheap insurance in a system built for speed.

Two coordination details from the building permit page round this out: new meters or meter upgrades need documentation of an approved location from SDG&E, and the City requires 65 percent construction and demolition waste diversion. Small items, but they are the kind that surface at the worst possible week if nobody owns them.

Why El Cajon payback leans on self-consumption

Residential solar customers here land on the Solar Billing Plan, SDG&E's name for the CPUC Net Billing Tariff, and are placed on EV-TOU-5, the eligible import rate named in Decision 22-12-056. Export credits are built from hourly avoided cost values, averaged by month, day type, and hour, per SDG&E's export pricing methodology. Credits roll over month to month until used or service ends, and they cannot offset the non-bypassable public purpose charges everyone pays.

Now the number that separates San Diego County from the rest of the state. The same CPUC decision granted transition adders on exports: PG&E residential customers get $0.022 per kWh, SCE customers $0.040, with larger CARE adders. SDG&E residential customers get $0.000. Zero, for CARE and non-CARE alike. An El Cajon export earns bare avoided cost with nothing on top, which is the sourced, unglamorous reason every serious quote here should be built on offsetting your own 43 cent imports, with storage doing the evening shift, rather than on selling power back.

Sizing has real rules, and one useful allowance: SDG&E permits sizing up to 50 percent above expected usage if the design is checked against your past 12 months and you attest to increased usage coming within 12 months of interconnection. That is the legitimate answer to "can I size for the EV I have not bought yet." The nine year legacy period, for what it protects, follows the customer rather than the address, so it transfers poorly in a home sale.

Be honest about who this market serves

El Cajon is not a subdivision-and-two-car-garage solar market. Of 37,245 housing units in the state's January 2026 count, only 41.3 percent are single detached, and 15,066 sit in buildings of five or more units, per the DOF file. A huge share of the people paying these SDG&E rates rent, and rooftop ownership math does not reach them. If that is you, your levers are rate plan selection and landlord conversations, not this page's calculator.

For owner households, the income picture argues for the equity programs before anything else. Median household income runs $66,045 on 2022 estimates with a 22.7 percent poverty rate, per the city's profile. That makes El Cajon a strong candidate pool for SGIP's Residential Solar and Storage Equity budget, $3,100 per kW and $1,100 per kWh for qualifying households, and for DAC-SASH no-cost installs through GRID Alternatives where CalEnviroScreen and CARE or FERA eligibility line up.

And the ledger has lost its old anchor: the 25D federal homeowner credit ended for systems completed after December 31, 2025, per the Congressional Research Service, though pre-2026 carryforward survives. The property tax exclusion for qualifying systems runs until its scheduled January 1, 2027 sunset. We found no El Cajon city rebate of any kind.

Sanity-check an El Cajon quote

Fair warning in the buyer's favor: this tool prices power at the statewide average, and El Cajon pays SDG&E rates well above that, so the estimate likely runs conservative on the value of self-consumed solar. It still cannot model hourly exports, the daily service charge, or a battery's arbitrage between 13 cent and 80 cent hours. Use it for scale, then make bidders show their hourly assumptions.

We are a solar installer and we also partner with other solar companies.

Receipts

The primary documents behind every claim on this page, reviewed August 26, 2026.

• City of El Cajon photovoltaic permitting page, building permits page, and PACO portal
• El Cajon fire hazard severity zone maps
• Government Code 65850.52, Government Code 66015, and the CEC permitting tracker
• SDG&E Solar Billing Plan, export pricing methodology, EV-TOU-5 rates, TOU-DR1 rates, and time periods
• SDG&E active CCAs, San Diego Community Power, and EIA Table 6
• CPUC Net Billing Tariff, Decision 22-12-056, SGIP, and DAC-SASH
• CRS federal credit note, BOE exclusion, DOF E-5 estimates, El Cajon background, and PVGIS