Solar Payback Period in San Marcos, California: When Does It Pay Off?
San Marcos, California — SDG&E service area
When Does Solar Pay Off in San Marcos?
A 7kW system in San Marcos costs approximately $21,000 at $3/watt. With annual savings of $3,444 (based on San Diego Gas & Electric's 41.0¢/57.0¢ rate tiers), the break-even point is approximately 6.1 years.
Without Solar: Projected San Diego Gas & Electric Bills
San Diego Gas & Electric rates have increased 89% (2014-2024). If that trend continues, the average San Marcos bill looks like this:
| Year | Est. Monthly Bill (no solar) | With Solar |
|---|---|---|
| 2026 (today) | $265/mo | ~$0/mo |
| 2031 (5 years) | $364/mo | ~$0/mo |
| 2036 (10 years) | $501/mo | ~$0/mo |
| 2041 (15 years) | $689/mo | ~$0/mo |
Projections use the 89% (2014-2024) 10-year CAGR as a straight-line estimate. Actual rate changes vary. Solar bill estimates assume fixed system output.
The Compounding Advantage
The payback period calculation above uses today's rates. In reality, as San Diego Gas & Electric rates rise each year, your solar savings grow too — because every kWh your panels produce is worth more. This means the effective payback period is typically shorter than the static calculation suggests, and the 25-year savings figure grows significantly with each rate increase.
More San Marcos Solar Guides
Ready to See Real Numbers for San Marcos?
Estimates on this page are based on local averages. A licensed installer will give you exact numbers for your home.
Calculate My Savings