For homeowners in Casa de Oro-Mount Helix, high electricity bills from San Diego Gas & Electric are a constant pressure. With retail rates around $0.323 per kWh, a typical household can spend over $260 monthly. Rooftop solar offers a direct way to lower that cost, but the rules have changed. In 2026, the value of solar is maximized by using the energy you generate yourself, rather than selling it back to the grid for a low price. This makes pairing solar with a battery a powerful strategy for bill control.
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Open calculatorBenchmark Cost Analysis
Solar & Battery System Costs in Casa de Oro-Mount Helix (2026)
Here are modeled cost estimates for a typical home in the area. These figures reflect pricing after the federal residential solar tax credit expired at the end of 2025.
- Solar-Only System (6.3 kW): A system of this size would have a gross cost of approximately $16,065. This option is designed to offset a significant portion of your electricity usage during the day.
- Solar + Battery System (6.3 kW panels with 10 kWh battery): Adding a home battery brings the total estimated cost to $31,065. The battery stores excess solar energy, which is critical for maximizing savings under SDG&E's net billing structure.
These are modeled estimates. The final cost depends on your specific roof, equipment choices, and installation details.
Incentives & Tax Credits
California Solar Incentives for 2026
While the 30% federal tax credit is no longer available for new systems installed in 2026, California homeowners still benefit from important state-level policies:
- Property Tax Exclusion: Installing a solar system in California will not increase your property taxes. The added value of the solar installation is excluded from your home's valuation for tax purposes, a benefit that runs through at least mid-2026.
- High Rate Avoidance: The most significant financial driver is avoiding SDG&E's high retail electricity rates. Every kilowatt-hour of solar energy you use at home is a kilowatt-hour you don't have to buy from the utility at a premium.
An owned solar system can also be an attractive feature for potential buyers, potentially supporting your home's resale appeal in the competitive San Diego County market.
Net Metering: San Diego Gas & Electric Co
Net Billing (low export)
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Understanding Export Rates with SDG&E Net Billing
Under California's current net billing tariff (NBT), you no longer get a 1-for-1 credit for the extra solar energy you send to the grid. Instead, you're compensated at a much lower rate based on the 'avoided cost'—what the utility would have paid for wholesale power.
In this area, you might buy electricity for over $0.32/kWh but only get around $0.11/kWh for the power you export. This is why storing your excess solar energy in a battery for later use is now the recommended strategy. It allows you to keep the full value of the energy you produce, rather than selling it to SDG&E for less.
Projected Savings
How Solar Translates to Real Savings
With SDG&E's high electricity rates, generating your own power creates significant value. The key is how you use that power. A solar-plus-battery system allows you to store daytime solar energy and use it during the evening, avoiding the need to buy expensive grid power after the sun goes down. This self-consumption strategy leads to greater savings.
- A solar-only system is estimated to save around $1,994 annually, with a payback period of about 7.4 years.
- A solar and battery system increases those savings substantially to an estimated $2,960 per year, with a payback period of around 8.6 years.
While the upfront cost is higher, the battery nearly doubles your annual savings by preventing you from selling your valuable solar energy back to SDG&E for a fraction of what they charge you.