Solar Savings in San Marcos, California
San Marcos homeowners on San Diego Gas & Electric pay an average of $260/month. At 41.0¢/kWh (Tier 1), here is what solar can realistically do for that bill.
San Diego Gas & Electric Rates in San Marcos
San Diego Gas & Electric charges 41.0¢/kWh for the first 130 kWh/month (Tier 1) and 57.0¢/kWh above that (Tier 2). The average San Marcos household uses around 540 kWh/month, putting most usage into the higher Tier 2 bracket, where solar saves the most per kWh.
San Diego Gas & Electric rates have increased 71% (2015-2025, CPUC Public Advocates Office). At that pace, the average San Marcos bill could reach $445/monthby 2036 without solar. A solar system locks in production at today's value and insulates you from future hikes.
| Utility | San Diego Gas & Electric |
| Tier 1 rate | 41.0¢/kWh (first 130 kWh/mo) |
| Tier 2 rate | 57.0¢/kWh (above 130 kWh/mo) |
| Avg monthly bill | $265 |
| Avg monthly usage | 540 kWh |
| Net metering | NEM 3.0 (since April 2023) |
| Export credit | ~$0.10/kWh |
| Rate increase (10yr) | 71% (2015-2025, CPUC Public Advocates Office) |
Solar Production in San Marcos
San Marcos receives 5.6 peak sun hours per day, above the California average of 5.2. This is the key input that determines how much electricity your panels produce. More sun hours mean more kWh generated, which translates directly to a lower bill.
Production estimates use a 7kW system at 80% efficiency (accounting for inverter losses, shading, and temperature derating). Actual output depends on roof orientation, tilt, and shading.
Real Savings Math for San Marcos
At San Diego Gas & Electric's 41.0¢ and 57.0¢/kWh rates, the average San Marcos homeowner pays ~$260/month. A 7kW system producing 954 kWh/month replaces most of that grid usage, cutting the bill to around $0/month.
Based on a 7kW system at $3/watt. Actual savings depend on your roof, usage pattern, and San Diego Gas & Electric rate plan. NEM 3.0 export credits (~$0.10/kWh) apply to power sent to the grid.
System Cost and Payback in San Marcos
A 7kW system in San Marcos costs approximately $21,000 installed (at ~$3/watt, the current California market rate). With annual savings of $3,444, the estimated break-even point is 6.1 years. Systems carry 25-year manufacturer warranties, leaving 15+ years of essentially free electricity.
| System size | 7kW (typical for this usage level) |
| Installed cost (~$3/W) | $21,000 |
| Est. monthly savings | $287 |
| Est. annual savings | $3,444 |
| Payback period | 6.1 years |
| 25-year savings | $86,100+ |
| Peak sun hours | 5.6 hrs/day |
| Annual production | 11,446 kWh |
| Utility | San Diego Gas & Electric |
| County | San Diego |
NEM 3.0 and What It Means for San Marcos Solar
Since April 2023, all new California solar installations fall under NEM 3.0. The key change: export credits dropped from near-retail rates to roughly ~$0.10/kWh. This makes self-consumption (using your solar power as it is produced) far more valuable than exporting to the grid.
- - Daytime AC, appliances, EV charging offset at full retail rate
- - Battery storage shifts evening usage off-grid
- - Protection from future rate increases (71% for San Diego Gas & Electric over the last decade)
- - Export credits: ~~$0.10/kWh (was near retail under NEM 2.0)
- - Oversizing panels for export is less financially efficient
- - Battery pairing is now more important than before
Solar Incentives for San Marcos Homeowners (2026)
- ✓Net metering (NEM 3.0): export credits for excess solar sent to the grid
- ✓Federal Section 48E credit (commercial/PPA structures only; residential Section 25D expired Dec 31 2025)
- ✓California Solar Rights Act: your HOA cannot legally block installation
- ✓California property tax exclusion: solar system value excluded from assessment
- ✓SGIP battery incentive: up to $1,000+ for battery storage (income-qualified programs available)
Incentive eligibility depends on your tax situation and installation timeline. Consult a licensed solar installer before making decisions.
Frequently Asked Questions: Solar in San Marcos
More Solar Guides for San Marcos
Get a Real Quote for San Marcos
These numbers are based on San Diego Gas & Electric rates and San Marcos sun data. A local installer will give you exact figures based on your roof, shading, and actual usage.
Get My Savings Estimate