PG&E Solar Power Calculator
Estimate your NEM 3.0 savings, total system cost, and payback period instantly.
7.2 Years
$15,925
$2,210
$78,450
25-Year Cumulative Financial Impact
Comparison of cumulative costs: Utility Only vs. Solar System.
What is a PG&E Solar Power Calculator?
A pg&e solar power calculator is a specialized financial tool designed for homeowners and businesses within the Pacific Gas and Electric (PG&E) service territory in California. Unlike generic calculators, this tool specifically accounts for the complex utility rate structures (such as E-ELEC and TOU-D) and the specific Net Energy Metering (NEM) rules applicable to Northern and Central California residents.
Anyone considering installing solar panels should use a pg&e solar power calculator to determine if the investment makes sense under the current NEM 3.0 landscape. A common misconception is that solar is no longer profitable under NEM 3.0. While the “export rates” have decreased, the high retail cost of PG&E electricity still makes solar a powerful tool for reducing monthly expenses, especially when paired with battery storage.
PG&E Solar Power Calculator Formula and Mathematical Explanation
The math behind a pg&e solar power calculator involves estimating annual energy production and weighing it against the “avoided cost” of purchasing power from the grid.
The core formula for Net System Cost is:
The Payback Period is calculated as:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| System Size | Total DC capacity of panels | kW | 4 – 12 kW |
| ITC | Federal Investment Tax Credit | % | 30% (Fixed) |
| NEM Yield | Value of exported energy | $/kWh | $0.05 – $0.45 |
| Efficiency | System losses (dirt, heat, inverter) | % | 75% – 85% |
Practical Examples (Real-World Use Cases)
Example 1: Standard Family Home (NEM 3.0)
Imagine a family in San Jose using the pg&e solar power calculator with a $300 monthly bill. They install a 7kW system. Under NEM 3.0 without a battery, their self-consumption is 40%. Their annual savings might be $1,800, leading to a payback of 9.5 years. By adding a battery, their self-consumption jumps to 90%, increasing savings to $2,800 and shortening the payback to 7 years.
Example 2: Small Business (Commercial Rate)
A small warehouse in Fresno installs a 20kW system. Using the pg&e solar power calculator, they find that because their usage is strictly during daylight hours, their self-consumption is naturally high (70%). Even without a battery, their ROI remains strong due to the high mid-day commercial rates.
How to Use This PG&E Solar Power Calculator
- Enter Monthly Bill: Look at your last 12 months of PG&E statements and find the average.
- System Size: If you have a quote, enter the kW size. If not, start with 6.5kW for an average home.
- Select NEM Version: Choose NEM 3.0 for all new installations.
- Battery Toggle: Select “Yes” if you plan to include a Powerwall or similar storage device.
- Price Per Watt: Adjust based on your local quotes (usually around $3.50).
- Analyze Results: Review the payback period and 25-year cumulative savings chart to evaluate the investment.
Key Factors That Affect PG&E Solar Power Calculator Results
- Retail Electricity Rates: As PG&E increases rates (historically ~5% annually), your solar savings increase proportionally.
- Self-Consumption Ratio: Under NEM 3.0, energy you use directly is worth $0.45/kWh, while exported energy is only worth ~$0.05/kWh.
- System Orientation: South-facing panels produce the most energy, but West-facing panels might be better for PG&E’s peak TOU rates.
- Federal Tax Credit (ITC): The current 30% credit significantly reduces the “Net Cost” in our pg&e solar power calculator.
- Inverter Efficiency: Micro-inverters vs. string inverters can affect the total annual kWh yield.
- Degradation: Solar panels lose about 0.5% efficiency per year, which is factored into long-term savings projections.
Frequently Asked Questions (FAQ)
Is solar still worth it under PG&E’s NEM 3.0?
Yes, but the strategy has changed. The pg&e solar power calculator shows that ROI is now driven by battery storage and self-consumption rather than just exporting energy to the grid.
What is the average payback period for PG&E customers?
Currently, with a battery, the payback period is typically 6 to 8 years. Without a battery, it may extend to 10+ years.
How does PG&E calculate the ‘export rate’?
Under NEM 3.0, it is based on the “Avoided Cost Calculator,” which varies by hour and month, averaging around 5-8 cents per kWh.
Does this calculator include the 30% Federal Tax Credit?
Yes, the pg&e solar power calculator automatically deducts the 30% ITC from the gross installation cost.
Will my PG&E bill be $0 with solar?
Rarely. You will still pay a minimum monthly delivery charge (usually around $15) and any non-bypassable charges.
Can I expand my system later?
Yes, but adding more than 1kW or 10% of the system size may trigger a move to the current NEM rules if you are on an older plan.
How long do solar panels last in California?
Most panels are warrantied for 25 years, though they can continue producing power for 30-40 years at a lower efficiency.
Does the pg&e solar power calculator account for inflation?
Our tool assumes a conservative 4% annual utility rate hike to reflect historical PG&E price trends.