Solar Payback in Fullerton: 2026 Break-Even Math

When Does Solar Pay Off in Fullerton?

A 7kW system in Fullerton costs approximately $21,000 at $3/watt. With annual savings of $2,412 (based on Southern California Edison's 34.5¢/42.0¢ rate tiers), the break-even point is approximately 8.7 years.

Without Solar: Projected Southern California Edison Bills

Southern California Edison rates have increased 83% (2015-2025, CPUC Public Advocates Office). If that trend continues, the average Fullerton bill looks like this:

Projections use the 83% (2015-2025, CPUC Public Advocates Office) 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 Southern California Edison 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.