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Is Solar Worth It in Bostonia, California?

We analyzed San Diego Gas & Electric (SDG&E) rate books, NREL irradiance data, and California tax codes to calculate the real ROI for homeowners in 92021.

Market Snapshot

Elec. Rate
$0.27/kWh
Sun Hours
6.23
Utility San Diego Gas & Electric (SDG&E)
Tax Exempt Yes
Battery Required

Analyst Note: The "4kW Benchmark"

The analysis below uses a standardized 4kW system to provide a fair baseline comparison across cities. However, the average electric bill in Bostonia is $218.7.

⚠️ Most homes here will need a larger system (8kW–12kW) to reach 100% offset. Use the calculator below for your exact numbers.

Homeowners in Bostonia and surrounding East County communities face some of the highest electricity rates in the entire country, courtesy of San Diego Gas & Electric (SDG&E). With rates that seem to climb every year, solar panels offer a proven way to take back control. But since SDG&E implemented its new Net Billing (NEM 3.0) policy, the best way to install solar has changed, with energy storage becoming the key to big savings.

Benchmark Cost Analysis

How Much Does a Solar + Battery System Cost in Bostonia?

In 2026, the benchmark for a new solar installation that effectively counters SDG&E's rates is a solar-plus-battery system. The upfront cost for a typical system is around $23,500. After applying the 30% federal tax credit, the net cost drops to approximately $16,450. This investment not only generates power but also stores it, protecting you from buying exorbitant peak-hour electricity from the grid.

While a solar-only system is cheaper upfront (around $8,050 net), it sacrifices the majority of potential savings under current SDG&E rules, making it a less strategic financial choice for most homeowners.

Incentives & Tax Credits

Tax Credits That Reduce Your System Cost

The single largest incentive is the 30% Federal Solar Tax Credit. This is a dollar-for-dollar credit that reduces your federal income tax liability. On a $23,500 system, that’s a $7,050 credit waiting for you. It covers both the panels and the battery, which is crucial for systems in SDG&E territory. California also offers a property tax exclusion, meaning your home's assessed value won't go up because you added a solar system.

Net Metering: San Diego Gas & Electric (SDG&E)

Policy Status

NEM 3.0 (2023)

Battery Priority

Critical 🔋

Understanding SDG&E's NEM 3.0 Policy

NEM 3.0 is the billing structure SDG&E uses for new solar customers. The critical change is that they now pay you very little—around 5-8¢ per kWh—for any excess solar energy you export to the grid. Because you pay them 5-8 times that amount to buy electricity back, sending power to the grid is a losing proposition. A battery solves this by ensuring your valuable solar energy is saved for your own use later, maximizing its financial value.

Projected Savings

Your Potential Savings Against SDG&E Rates

Pairing solar panels with a battery allows you to slash your dependence on SDG&E, leading to an estimated annual savings of $1,759. It's important to note this calculation uses a blended rate of $0.27/kWh; since many SDG&E Time-of-Use plans charge over $0.40/kWh during peak summer afternoons, your actual savings could be significantly higher. By using your stored battery power from 4 PM to 9 PM, you avoid these highest charges entirely.

Local Questions Answered

Do panels work during 'May Gray' and 'June Gloom' in Bostonia?
Absolutely. Solar panels generate power from light, not just direct sun. While production is lower on overcast days, San Diego County's high number of annual sunny days ensures the system produces a large amount of energy over the year. The system is sized based on annual, not daily, performance.
Why is a battery essential with SDG&E now?
Because SDG&E's NEM 3.0 export rates are so low, you lose significant value by sending your midday solar power to the grid. A battery lets you store that energy and use it yourself during peak evening hours when SDG&E's electricity prices are highest. This 'self-consumption' is what generates the majority of your savings.
Will a solar and battery system protect me from blackouts?
Yes. A key benefit of adding a battery is the ability to have backup power during grid outages. Your system can be configured to keep essential circuits—like your refrigerator, lights, Wi-Fi, and outlets—powered up when the grid goes down, providing peace of mind.

Calculate Your Solar Savings

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* Calculations based on San Diego Gas & Electric (SDG&E) residential rates (0.27/kWh).

Data Transparency & Methodology

Estimates for Bostonia, California are produced by the SunCents Solar Engine (v1.2). We combine the following verified or standard industry sources:

Performance (PV production)

NREL PVWatts — modeled annual and hourly AC output (kWh), solar radiation, and system losses for a standardized array size so cities can be compared fairly.

nrel.gov

Electricity rates (tariffs)

U.S. Energy Information Administration (EIA) — state-level average retail electricity prices ($/kWh) and supporting series for economic context.

eia.gov

Incentives & programs

DSIRE — state and local rebates, net metering, and policy programs (summarized for readability; always confirm eligibility with a tax or solar professional).

dsireusa.org

Federal tax credit (ITC)

Investment Tax Credit — federal residential solar credit (e.g. 30% of qualified costs where applicable); rules change with statute—verify with a qualified advisor.

energy.gov

Utilities & interconnection

Where shown, local utilities (e.g. APS, PG&E, FPL, and other IOUs or munis) are mapped from public interconnection, tariff, or service-territory references so net metering and rider rules match your area—not generic national averages.