Pennsylvania Solar Savings Calculator
Calculate Pennsylvania solar costs, 2026 federal tax-credit status, retail net metering, SREC revenue, payback period, and 25-year savings.
Cost and Savings
Production and Impact
Calculation Method
- Gross cost: System kW times 1,000 times cost per watt.
- Incentives: Entered federal percentage, state percentage, rebates, and SREC revenue.
- Annual production: System kW times 1,250 kWh (Mid-Atlantic climate).
- Self-used solar: Offsets the full retail electricity rate.
- Exported solar: Earns the entered net metering credit rate.
- Payback: Year when cumulative net savings equal the net system cost.
2026 Data Inputs
- Pennsylvania residential electricity rate: approximately $0.17/kWh including supply.
- Pennsylvania solar production: approximately 1,250 kWh per kW annually.
- Installed cost range: approximately $2.90-$3.40 per watt.
- Statewide retail net metering with annual price-to-compare true-up.
- PA SREC market available through PJM-GATS registration.
Estimates only. Verify utility rates, net metering true-up terms, SREC pricing, local tax treatment, and federal tax status with your utility, installer, and tax professional.
What Is the Pennsylvania Solar Savings Calculator?
The Pennsylvania Solar Savings Calculator estimates the upfront net cost of a residential solar system, its electricity production, the year it may recover its cost, and its financial return over 25 years. It uses your electric bill, electricity rate, system specifications, export credits, and entered incentives to calculate these estimates.
For Pennsylvania homeowners, understanding these figures can help when reviewing solar installation quotes or comparing different system sizes. A lower installation price does not always mean a shorter payback period. Electricity production, self-consumption, and the value of exported energy also affect the calculation.
The calculator uses a 25-year projection with an assumed annual solar production decline of 0.5%. It also accounts for an entered annual electricity rate increase. Its results are estimates based on the information and assumptions supplied, rather than guarantees of future savings.
How the Pennsylvania Solar Savings Calculation Works
The calculator combines installation costs, estimated electricity production, energy savings, export credits, and recurring financial adjustments. It projects annual savings for 25 years and identifies when accumulated savings first cover the net installation cost.
1. Calculate Gross and Net Solar System Cost
Gross system cost depends on the installed capacity in kilowatts (kW) and installation cost per watt. Since one kilowatt equals 1,000 watts, the calculator uses:
Where G is gross system cost, S is system size in kW, and W is installed cost per watt.
The calculator then subtracts entered federal and state percentage credits and upfront rebates. Both percentage credits are calculated against the original gross cost.
Here, N is net system cost, f is the entered federal credit percentage, t is the entered Pennsylvania state credit percentage, and R is the upfront rebate amount. The net cost cannot fall below zero.
The calculator’s 2026 default settings use 0% for both federal and Pennsylvania state solar credits. Its accompanying notes identify the residential Section 25D credit as unavailable for systems placed in service after December 31, 2025. The percentage fields remain editable, but entering a credit does not establish tax eligibility.
2. Estimate Annual Electricity Usage and Solar Production
The calculator estimates annual household electricity consumption using the monthly electric bill and electricity rate. It estimates first-year solar generation using 1,250 kilowatt-hours (kWh) per installed kW.
U is estimated annual electricity usage in kWh, B is the monthly electric bill, and r is the entered electricity rate in dollars per kWh. P is solar production, S is system size, and y is the projection year from 1 through 25.
The production formula reduces output by 0.5% annually, beginning in year two. Actual solar generation can differ because of roof direction, shading, local weather, equipment performance, and installation conditions.
3. Calculate Self-Used and Exported Solar Electricity
The calculator distributes estimated annual solar production across 12 months using fixed monthly percentages. From January through December, these shares are 1%, 2%, 4%, 8%, 15%, 19%, 19%, 15%, 8%, 4%, 2%, and 3%.
Q represents solar production for a given month and year, calculated by multiplying that year’s production by the month’s percentage share. The variable s is the entered daytime self-consumption percentage. H is electricity used directly by the household, limited to estimated monthly household usage. X is the remaining exported electricity.
Self-consumed energy is valued at the retail electricity rate. Exported energy is valued at the separately entered export credit rate.
4. Calculate Annual Savings
A represents annual financial savings. The calculation adds the value of self-consumed electricity and exported electricity, subtracts annual utility solar fees (F), and adds entered annual property tax savings (T) and SREC revenue (C).
The retail rate and export credit rate both increase annually by the entered utility rate increase percentage. The annual fee, property tax savings, and SREC revenue amounts remain constant throughout the projection.
5. Calculate Payback Period and 25-Year Net Savings
The payback period is the first whole projection year when accumulated annual savings equal or exceed net installation cost. If net cost is zero, the calculator displays an immediate payback. If the cost is not recovered within 25 years, it displays “25+ Years.”
This result represents projected financial benefits over 25 years after subtracting the net system cost. A negative value means the modeled benefits are less than the net installation cost.
6. Estimate Solar Offset and Carbon Dioxide Offset
The calculator also compares first-year solar generation with estimated annual household electricity usage. For environmental impact, it applies a fixed factor of 0.45 tons of CO2 per 1,000 kWh of total projected solar production.
The solar offset percentage can exceed 100% because it compares annual generation with annual usage. It does not mean every kilowatt-hour consumed by the household is supplied directly by solar panels.
Pennsylvania Solar Savings Calculation Example
Consider a hypothetical installation using the calculator’s default values:
| Input | Example Value |
|---|---|
| Monthly Electric Bill | $130 |
| Electricity Rate | $0.170/kWh |
| Solar System Size | 8 kW |
| Installed Cost per Watt | $3.10 |
| Export Credit | $0.170/kWh |
| Daytime Self-Consumption | 30% |
| Annual Utility Rate Increase | 3.5% |
| Federal and State Credits | 0% |
| Rebates, Annual Fees, Property Tax Savings, and SREC Revenue | $0 |
Step 1: Calculate system cost. An 8 kW system contains 8,000 watts. At $3.10 per watt, gross cost is $24,800. With no entered credits or rebates, net cost is also $24,800.
Step 2: Calculate first-year generation. An 8 kW system produces an estimated 10,000 kWh in year one using the calculator’s production factor.
Step 3: Calculate initial electricity value. With 30% self-consumption, the first-year calculation allocates 3,000 kWh to household use and 7,000 kWh to exports. Both receive an entered value of $0.17 per kWh, giving $1,700 in modeled first-year financial benefits.
Step 4: Project long-term results. Applying the 3.5% annual rate increase and 0.5% annual solar production decline produces the following results:
| Calculated Result | Estimated Value |
|---|---|
| Gross System Cost | $24,800 |
| Net System Cost | $24,800 |
| Year 1 Solar Production | 10,000 kWh |
| Estimated Annual Electricity Usage | 9,176 kWh |
| Solar Offset | 109% |
| Payback Period | 13 Years |
| 25-Year Net Savings | $37,039 |
| 25-Year CO2 Offset | 106.0 tons |
These values illustrate the calculation method, not a typical Pennsylvania installation or a guaranteed investment outcome.
How to Use the Pennsylvania Solar Savings Calculator
- Enter Monthly Electric Bill ($): Provide your approximate monthly electricity expense.
- Enter Electricity Rate ($/kWh): Use a positive rate so the calculator can estimate annual electricity usage.
- Enter System Size (kW): Specify the proposed solar panel system capacity.
- Enter Installed Cost per Watt ($): Provide the installation price per watt from your solar quote.
- Select Your Utility: Choose PECO, PPL Electric, Met-Ed / Penelec / West Penn, Duquesne Light, or Cooperative or Municipal.
- Adjust Net Metering Inputs: Enter the Export Credit ($/kWh), Daytime Self-Consumption (%), Annual Utility Rate Increase (%), and Annual Utility Solar Fees ($).
- Review the Battery Option: The form includes a checkbox labeled “Battery storage or high daytime self-use.”
- Enter Incentives: Adjust Direct Federal Credit (%), Pennsylvania State Credit (%), Upfront Rebates ($), Property Tax Savings ($/yr), and Annual SREC Revenue ($), when applicable.
- Click Calculate Savings: Review the estimated net system cost, payback period, 25-year net savings, production figures, and solar offset.
- Use Reset if Needed: Restore the default form values and clear the displayed results.
The utility selection and battery checkbox appear in the interface but do not change the calculation in the supplied version. To change modeled export compensation or daytime energy use, adjust the numerical Export Credit and Daytime Self-Consumption fields directly.
Understanding Your Pennsylvania Solar Savings Results
Several factors influence the estimated financial return from a solar installation. Understanding these assumptions can help you interpret the results more accurately.
Installation Cost and Incentives
A higher installed cost per watt increases the gross system cost when capacity stays unchanged. Entered federal credits, state credits, and upfront rebates reduce the net cost. Because credit percentages are editable, only enter amounts you have reason to expect. The calculator does not determine incentive eligibility.
Net Metering and Export Compensation
Net metering can affect the financial value of electricity sent to the grid. The calculator’s Pennsylvania notes describe retail-rate net metering for investor-owned utilities, monthly credit rollover, and annual true-up at the utility price-to-compare. Cooperative and municipal arrangements may differ.
However, the actual calculation values all exported electricity using the entered export credit rate, with annual increases applied. It does not separately calculate monthly credit rollover or annual true-up adjustments. The export rate is therefore an important modeling assumption.
Daytime Self-Consumption
Self-consumption means using solar electricity directly in your home rather than exporting it. The calculator values self-consumed electricity at the retail rate, while exported electricity receives the entered export rate. If these rates differ, changing the self-consumption percentage may change estimated savings.
SREC Revenue and Annual Costs
A Solar Renewable Energy Certificate (SREC) represents renewable electricity generation. The calculator references Pennsylvania’s SREC market and allows you to enter an annual dollar amount for SREC revenue. It adds that amount to each projected year’s financial benefits.
Annual utility solar fees reduce savings, while entered property tax savings increase them. These amounts remain fixed in the model, even though real-world costs and SREC market prices may change.
Important Display Details
The supplied calculator has several result labels that do not match the underlying calculations. The row labeled “Net Year 1 Savings” actually displays positive 25-year net savings, or $0 if the 25-year result is negative. It should not be interpreted as the first year’s savings.
Likewise, the rows labeled “Year 1 Self-Use kWh” and “Year 1 Export kWh” display values from the final projection year, after 24 annual production reductions. The separate “Year 1 Production” value does represent first-year generation.
Currency outputs are displayed in whole U.S. dollars, energy amounts in whole kWh, the payback period in whole years, and the 25-year CO2 offset to one decimal place.
Frequently Asked Questions
How much money can solar panels save in Pennsylvania?
Potential savings depend on system capacity, installation price, electricity rates, self-consumption, export compensation, and applicable incentives. This calculator estimates cumulative financial benefits over 25 years and subtracts the net installation cost. Changing the inputs can produce substantially different results.
How long does it take for solar panels to pay for themselves?
The payback period is the first year when cumulative modeled savings cover the net system cost. The calculator checks each year of its 25-year projection. It reports an immediate payback for a zero net cost and “25+ Years” when cost recovery does not occur within the modeled period.
Does the Pennsylvania solar calculator include federal and state tax credits?
Yes. It includes editable fields for federal and Pennsylvania state credit percentages. Both default to 0% in its 2026 configuration. If you enter a positive percentage, the calculator subtracts the corresponding amount from gross installation cost. It does not verify tax eligibility or determine which incentives are legally available.
Does the calculator account for solar panel degradation?
Yes. It assumes electricity generation declines by 0.5% each year after the first year. This gradually reduces modeled solar output throughout the 25-year calculation. The annual degradation assumption is fixed in the calculation rather than entered by the user.
Why can the solar offset percentage exceed 100%?
Solar offset is calculated by dividing first-year estimated solar generation by estimated annual household electricity usage and multiplying by 100. If production exceeds calculated usage, the result can exceed 100%. This is an annual energy comparison, not a guarantee that your system covers electricity demand at every moment.
Does battery storage change the solar savings estimate?
Not directly in the supplied version. Although the interface includes a battery storage or high daytime self-use checkbox, that checkbox is not referenced in the calculation. The Daytime Self-Consumption (%) field does affect how solar production is divided between direct household use and exports. No separate battery cost is calculated.
How reliable are the 25-year solar savings estimates?
The estimates follow a defined mathematical model, but actual results can differ. Future electricity prices, production levels, solar equipment performance, utility policies, installation costs, taxes, and SREC revenue may not match the entered assumptions. Use the results for preliminary planning and verify important financial details with qualified providers.