Solar Panel Cost in El Cajon, CA (2026): $4.49/W Reported
By Chad SimpsonUpdated 6 sources citedEl Cajon, San Diego County
El Cajon homeowners who bought their own solar systems reported a median of $4.49 per watt between January 2025 and May 2026, across 497 systems. The middle half paid $3.24 to $5.44 per watt.
A 6.7 kW system, the median size connected in El Cajon in 2025, comes to about $30,100 at that median, or $21,700 to $36,400 across the middle half.
Those are reported costs, not a quote, and no federal credit comes off a El Cajon system finished in 2026: 26 U.S.C. §25D does not cover one whose installation is completed after December 31, 2025 (state and federal rules).
- Median reported cost
- $4.49/W
- El Cajon addresses, 497 systems
- Middle half
- $3.24 to $5.44/W
- 25th to 75th percentile
- Typical 6.7 kW system
- $30,100
- 6.7 kW × $4.49/W, before any incentive
- Same system, middle half
- $21,700 to $36,400
- size: El Cajon addresses, 2025 median
Source: California Distributed Generation Statistics (CPUC), Interconnected Project Sites data set, data through May 31, 2026, checked September 24, 2026. Homeowner-owned, solar-only systems of 1 to 25 kW; leases, PPAs and battery systems are left out (method). The CPUC notes these costs are not verified by the government.
California Rate Relief is a referral service. We are not a licensed contractor.
What a solar permit costs in El Cajon
El Cajon does not publish a dollar figure for a residential solar permit. Whatever it charges, Government Code §66015 limits a city to $450 for a home system up to 15 kW, plus $15 per kW above that, unless it adopts a written finding that its cost is higher.
- What El Cajon publishes: El Cajon's photovoltaic page does not state a dollar figure. It says the permit is issued electronically as soon as all applicable fees are paid, that SolarAPP+ includes three free revisions, and that fee questions go to Building Safety at 619-441-1726 or Building@elcajon.gov.
- How to file: Yes. Licensed contractors get SolarAPP+ pre-approval, then apply on the City's SolarAPP+ permit site, where the permit issues once fees are paid. Adding a battery energy storage system has been eligible through SolarAPP+ since January 2026.
- Automated permit platform: SolarAPP+
Sources: City of El Cajon, Photovoltaic (SolarAPP+) page, checked September 23, 2026; Gov. Code §66015, checked September 24, 2026. El Cajon in the California Solar Cost Index sets this fee beside every other city's.
Solar in El Cajon: installs, leases and batteries
Home solar systems connected at El Cajon addresses: 1,032 in 2021, 1,484 in 2022, 1,675 in 2023, 726 in 2024 and 630 in 2025. So connections peaked in 2023 and 2025 ran 62% below that peak. Another 201 were connected from January to May 2026.
Of the 630 systems connected in El Cajon in 2025, 31% were leased or on a PPA, so a solar company owns them, and 69% belonged to the homeowner. 0% had a battery, less often than the 55% statewide. The median El Cajon system was 6.7 kW, and 109 companies connected at least one.
| El Cajon | San Diego County | Statewide | |
|---|---|---|---|
| Systems connected in 2025 | 630 | 14,679 | 145,404 |
| Leased or on a PPA | 31% | 36% | 45% |
| With a battery | 0% | 0% | 55% |
| Median system size | 6.7 kW | 5.36 kW | 6.15 kW |
| Median reported cost | $4.49/W (497) | $4.84/W (11,130) | $4.14/W (58,628) |
| Companies connecting systems | 109 | 483 | 2,475 |
Source: CPUC DG Stats, data through May 31, 2026. Counts are home systems given permission to operate each year; a city means the service city on the application.
Your utility: SDG&E
El Cajon is billed by San Diego Gas & Electric (SDG&E). SDG&E's average residential rate is 45.5¢/kWh (June 1, 2026; rate tracker).
Before you compare proposals
The El Cajon project checks that change the decision
El Cajon's SolarAPP+ route replaces City inspections with a third-party inspection declaration and a final review, and the bill has no community choice provider. Both change what a quote has to cover.
Ask the same three questions
- Does the design fit the SolarAPP+ eligibility checklist, and if a battery is included, is it on the same SolarAPP+ permit as the panels?
- Who completes the third-party inspection declaration, uploads it to the City's PACO portal and requests the final review that releases the project to SDG&E?
- Does the bill model use SDG&E's own generation rates rather than a community choice provider's?
Local checks
A declaration instead of City inspections
On El Cajon's SolarAPP+ route the contractor completes a third-party inspection declaration on the permit, uploads it to the City's PACO portal and requests a final review to obtain SDG&E's solar release. The City says no other City inspections are required.
Batteries can go through SolarAPP+
Since January 2026, El Cajon has accepted battery energy storage systems through SolarAPP+. Ask whether the battery in a quote is permitted with the panels or on its own.
SDG&E supplies generation too
SDG&E's list of active community choice aggregators names Chula Vista, La Mesa, San Diego and other nearby cities but not El Cajon, so an El Cajon bill normally shows SDG&E for generation as well as delivery.
Related decisions
Local sources and limits
- City of El Cajon — Photovoltaic (SolarAPP+) — verified 2026-09-23. SolarAPP+ pre-approval, then the City SolarAPP+ permit site; permit issues once fees are paid; three free revisions; battery storage eligible since January 2026; contractor completes a third-party inspection declaration, uploads it to PACO and requests final review for SDG&E release; no other City inspections required. No fee amount stated.
- SDG&E — Active CCAs — verified 2026-09-23. Names the cities served by Clean Energy Alliance and San Diego Community Power. A city missing from both lists has no active CCA named there.
Before you sign
In El Cajon the middle half of reported costs spans $3.24 to $5.44 per watt, and roof, panel work, equipment and contract terms explain most of that gap. California Solar Tax and Permit Rules for 2026 covers them, and the tax, lease and disclosure rules a El Cajon contract follows.
Frequently asked questions
How much does solar cost in El Cajon?
About $30,100 for a 6.7 kW system, at the $4.49 per watt median that El Cajon owners reported (497 systems, January 2025 to May 2026; middle half $3.24 to $5.44). Source: CPUC DG Stats. No federal credit applies to a El Cajon system finished in 2026.
What does a solar permit cost in El Cajon?
El Cajon states no single current figure (no figure published, checked September 23, 2026); Gov. Code §66015 caps it at $450 up to 15 kW unless the city adopts a written finding.
Which utility serves El Cajon?
San Diego Gas & Electric (SDG&E). Its average residential rate is 45.5¢/kWh, as of June 1, 2026.
Sources
- California Distributed Generation Statistics (CPUC), Interconnected Project Sites data set, data through May 31, 2026 — checked September 24, 2026
- CPUC, California Solar Consumer Protection Guide — checked September 24, 2026
- 26 U.S.C. §25D(h) and (e)(8)(A), residential clean energy credit — checked September 24, 2026
- El Cajon solar permitting — City of El Cajon, Photovoltaic (SolarAPP+) page — checked September 23, 2026
- California Government Code §66015(a), residential solar permit fees — checked September 24, 2026
- SDG&E average residential rate — CPUC Public Advocates Office, Q2 2026 Electric Rates Report, p.8, 24 — checked November 9, 2026
The tax, contract and permit rules every California city shares, with their statutes: California Solar Tax and Permit Rules for 2026.
Have your bill reviewed
Start with the utility on your bill and what you pay in a typical month. Contact details come after that. The calculators and checklists on this page stay usable without submitting anything.
California Rate Relief is a referral service. We are not a licensed contractor. California Rate Relief is compensated by a solar provider when a homeowner we refer signs an agreement. How we make money
Before you send anything
- What this is
- California Rate Relief is a private referral service. It is not a contractor, does not install or finance anything, and is not a utility, a government agency or an assistance program.
- What happens after the form
- Your project details are recorded for referral to a solar provider. The provider decides whether it can help and what it can offer; availability, design and price are determined after its own review.
- How you are contacted
- Read the consent wording before submitting. Your inquiry includes contact details for follow-up about the project; a provider decides whether it can serve it.
- Using the site without submitting
- The calculators, bill comparisons and checklists on this site work without contact details, and nothing on this page requires a submission.