Texas Solar Savings Calculator: 2026 Updated

Texas Solar Savings Calculator

Calculate Texas solar costs, 2026 federal tax-credit status, retail buyback and utility export plans, property tax exemption, payback period, and 25-year savings.

Texas 2026 rules: No state income tax means no state solar tax credit. The federal Section 25D credit ended for systems placed in service after December 31, 2025. Texas has no statewide net metering mandate; deregulated areas use retail electric provider buyback plans, Austin Energy uses a Value of Solar tariff, and CPS Energy offers its own export terms. Texas exempts solar systems from property tax assessment.

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Estimates only. Verify retail plans, export credit terms, property tax exemption, and federal tax status with your provider, installer, and tax professional.

What Is the Texas Solar Savings Calculator?

The Texas Solar Savings Calculator estimates the net cost of a residential solar system, its first-year electricity production, the time needed to recover installation costs, and potential savings over 25 years. It values electricity used directly at home and electricity exported to the grid using separate rates, then accounts for entered incentives and recurring financial adjustments.

Texas homeowners can use the calculator to review solar installation quotes and explore different system sizes, buyback rates, and electricity price assumptions.

The tool includes utility or market choices for deregulated ERCOT areas, Austin Energy, CPS Energy, and cooperative or municipal providers. However, these selections do not automatically change the calculations. You must enter the export credit rate you want to model.

The calculator estimates first-year production using 1,550 kilowatt-hours (kWh) per installed kilowatt (kW). It projects results for 25 years with a fixed 0.5% annual decline in solar production.

How the Texas Solar Savings Calculation Works

The calculator follows several steps. It determines installation cost, applies entered incentives, estimates household electricity use and solar production, and calculates annual financial benefits. It then identifies the payback year and subtracts net installation cost from accumulated 25-year savings.

1. Calculate Gross Solar System Cost

Gross installation cost depends on system size and installed cost per watt. Since one kilowatt equals 1,000 watts, the formula is:

G=S\times1{,}000\times C

Where G is gross system cost in dollars, S is system size in kW, and C is installed cost per watt in dollars.

For example, a 9 kW system priced at $2.80 per watt has a gross cost of $25,200.

9\times1{,}000\times2.80=25{,}200

2. Calculate Net Cost After Credits and Rebates

The calculator deducts the entered federal credit percentage, Texas state credit percentage, and upfront rebates from gross cost.

N=\max\left(0,G-\frac{Gf}{100}-\frac{Gt}{100}-R\right)

Here, N represents net system cost, f is the federal credit percentage, t is the state credit percentage, and R is upfront rebates.

Both percentage credits are calculated from the original gross cost. Net cost cannot fall below zero.

The calculator’s 2026 configuration defaults to 0% federal and Texas state credits. Its accompanying notes state that the residential federal Section 25D credit ended for systems placed in service after December 31, 2025, and that Texas does not offer a state solar income tax credit. These are statements in the supplied calculator, not eligibility determinations made by its code.

3. Estimate Annual Household Electricity Usage

The calculator estimates annual electricity usage from your monthly electric bill and retail electricity rate.

U=\frac{12B}{r}

U is estimated annual electricity usage in kWh, B is the monthly bill in dollars, and r is the electricity rate in dollars per kWh.

Using the default $150 monthly bill and $0.14 electricity rate gives approximately 12,857 kWh of annual usage.

A positive electricity rate is needed for this calculation. Although the input field allows a minimum of zero, the mathematical code does not separately handle division by zero.

4. Estimate Solar Electricity Production

The calculator assumes a first-year production rate of 1,550 kWh per installed kW. After the first year, it reduces estimated annual production by 0.5%.

P_y=1{,}550S(0.995)^{y-1}

P represents annual production in kWh, S is system capacity in kW, and y is the projection year from 1 to 25.

A 9 kW system therefore produces an estimated 13,950 kWh in its first year.

For the monthly calculations, the tool allocates each year’s electricity production using fixed seasonal percentages. This affects how much electricity is treated as directly consumed rather than exported.

5. Calculate Self-Consumed and Exported Electricity

The model separates solar electricity used directly by the household from electricity exported to the grid.

H_{y,m}=\min\left(Q_{y,m}\times\frac{s}{100},\frac{U}{12}\right)

X_{y,m}=\max(0,Q_{y,m}-H_{y,m})

Q is solar production in a particular month, s is the entered daytime self-consumption percentage, H is directly consumed electricity, and X is exported electricity.

Directly consumed solar electricity is limited to estimated monthly household usage. Any remaining production is counted as exported electricity.

The calculator values directly consumed electricity at the retail rate and exported electricity at the entered Export Credit ($/kWh) rate.

6. Calculate Annual Financial Savings

Annual financial savings combine the value of directly used solar electricity and electricity exports. The calculation subtracts annual utility solar fees and adds the entered annual property tax savings amount.

A_y=\sum_{m=1}^{12}(H_{y,m}r_y+X_{y,m}e_y)-F+T

Where A is annual savings, r is the retail electricity rate, e is the export credit rate, F is annual utility solar fees, and T is annual property tax savings.

The calculator increases both electricity rates by the entered Annual Utility Rate Increase percentage each year. It keeps the annual fee and property tax savings amounts constant throughout the projection.

7. Calculate Payback Period and 25-Year Net Savings

The payback period is the first whole year when accumulated annual savings equal or exceed net system cost.

\text{Payback Year}=\min\left\{y:\sum_{i=1}^{y}A_i\geq N\right\}

The calculator checks this condition over 25 years. If net cost is zero, it displays an immediate payback. If the cost is not recovered within 25 years, it displays “25+ Years.”

Its main long-term financial result is calculated as:

\text{25-Year Net Savings}=\sum_{y=1}^{25}A_y-N

A positive result means the modeled financial benefits exceed net installation cost. A negative result means the system has not recovered that cost during the 25-year projection.

8. Calculate Solar Offset and CO2 Offset

Solar offset compares first-year solar generation with estimated annual household electricity usage.

\text{Solar Offset (\%)}=\frac{P_1}{U}\times100

The calculator also estimates a 25-year carbon dioxide offset using a fixed factor of 0.45 tons per 1,000 kWh of total projected solar generation.

\text{25-Year CO}_2\text{ Offset}=\frac{\sum_{y=1}^{25}P_y}{1{,}000}\times0.45

Worked Example: A 9 kW Texas Solar System

Consider a hypothetical Texas installation using the calculator’s default inputs.

Input	Value
Monthly Electric Bill	$150
Electricity Rate	$0.140/kWh
System Size	9 kW
Installed Cost per Watt	$2.80
Export Credit	$0.080/kWh
Daytime Self-Consumption	30%
Annual Utility Rate Increase	3.5%
Annual Utility Solar Fees	$0
Federal Credit	0%
Texas State Credit	0%
Upfront Rebates	$0
Annual Property Tax Savings	$100

Step 1: Calculate system cost. A 9 kW system contains 9,000 watts. At $2.80 per watt, gross installation cost is $25,200. With no entered credits or rebates, net cost is also $25,200.

Step 2: Estimate electricity production. Multiplying 9 kW by 1,550 kWh gives 13,950 kWh of first-year production.

Step 3: Divide production between household use and exports. With 30% daytime self-consumption, the first-year calculation allocates 4,185 kWh to direct household use and 9,765 kWh to exports.

Step 4: Calculate first-year financial benefits. Direct electricity use is valued at 4,185 × $0.14 = $585.90. Exports are valued at 9,765 × $0.08 = $781.20. Adding $100 in entered property tax savings gives $1,467.10 in first-year modeled benefits.

Step 5: Project future savings. The calculator applies a 3.5% annual electricity rate increase and a 0.5% annual production decline across 25 years.

Calculated Result	Estimated Value
Gross System Cost	$25,200
Net System Cost	$25,200
Year 1 Production	13,950 kWh
Estimated Annual Usage	12,857 kWh
Solar Offset	109%
First-Year Financial Benefits	$1,467.10
Payback Period	15 Years
25-Year Net Savings	$27,029
25-Year CO2 Offset	147.9 tons

The model calculates approximately $52,229 in financial benefits over 25 years. After subtracting the $25,200 net installation cost, estimated net savings are approximately $27,029.

These values demonstrate the calculator’s mathematical assumptions. They are not guaranteed financial outcomes or estimates for every Texas household.

How to Use the Texas Solar Savings Calculator

Enter Monthly Electric Bill ($): Provide your approximate monthly electricity expense.
Enter Electricity Rate ($/kWh): Use a positive rate from your electricity plan or bill.
Enter System Size (kW): Specify the proposed solar system capacity.
Enter Installed Cost per Watt ($): Use the installation price per watt from your quote.
Select Utility or Market: Choose Deregulated ERCOT (REP buyback plan), Austin Energy (Value of Solar), CPS Energy (San Antonio), or Cooperative or Municipal.
Enter Export Credit ($/kWh): Provide the rate you want the model to apply to exported electricity.
Adjust Daytime Self-Consumption (%): Enter a percentage between 0% and 100%.
Enter Annual Utility Rate Increase (%): Choose an assumed annual increase between 0% and 50%.
Enter Annual Utility Solar Fees ($): Include relevant recurring solar-related utility fees.
Review the Battery Option: The form includes a checkbox labeled “Battery storage or high daytime self-use.”
Adjust Incentives: Review Direct Federal Credit (%), Texas State Credit (%), Upfront Rebates ($), and Property Tax Savings ($/yr).
Click Calculate Savings: Review estimated costs, payback time, 25-year savings, electricity production, and environmental impact.
Click Reset: Return the form to its default values and clear the previous results.

Focus on the Payback Period and 25-Year Net Savings results when comparing financial assumptions. The utility selection and battery checkbox do not directly affect the calculation in the supplied code. To model different electricity export terms or self-consumption, change the relevant numerical inputs.

Important Factors That Affect Texas Solar Savings

Electricity Buyback Plans and Export Credits

The calculator’s 2026 notes describe different electricity export arrangements across Texas. These include retail electric provider buyback plans in deregulated areas, Austin Energy’s Value of Solar approach, and separate CPS Energy terms.

However, the actual calculation uses the Export Credit ($/kWh) value you enter. It does not retrieve provider tariffs, calculate bill-credit expiration, or automatically apply different pricing based on the selected market.

The default export credit is $0.08 per kWh, compared with a retail electricity rate of $0.14 per kWh. Because these rates differ, the share of solar electricity consumed directly at home affects the projected savings.

Daytime Self-Consumption

Self-consumption means using solar electricity directly in the home instead of exporting it. The calculator values this electricity at the retail rate.

When the export credit is lower than the retail rate, increasing self-consumption can increase modeled savings. However, the calculation limits directly consumed solar electricity to estimated monthly household usage.

Texas Property Tax Savings

The calculator’s notes describe a Texas property tax exemption for the added value of residential solar systems. Its Property Tax Savings ($/yr) input defaults to $100.

This amount is added to modeled savings every year. The calculator does not estimate your home’s assessed value, property tax bill, or exemption amount. Entered savings should therefore reflect a separately supported assumption rather than an automatically determined benefit.

Electricity Rates and Long-Term Assumptions

The default Annual Utility Rate Increase is 3.5%. The calculator applies this percentage to both retail electricity prices and export credits each year.

Higher future electricity rates generally increase modeled savings, while the 0.5% annual production decline reduces the amount of solar electricity generated. Actual rates, equipment output, maintenance costs, and utility arrangements may differ from the assumptions used.

Understanding the Displayed Results

Three result labels in the supplied code do not match the data they display:

Net Year 1 Savings: This row displays positive 25-year net savings, or $0 when that amount is negative. It does not display the first year’s financial savings.
Year 1 Self-Use kWh: This row displays the self-consumed electricity calculated for year 25 rather than year one.
Year 1 Export kWh: This row displays electricity exports calculated for year 25 rather than year one.

For the default example, those self-use and export rows display approximately 3,711 kWh and 8,658 kWh. The actual calculated first-year amounts are 4,185 kWh and 9,765 kWh.

The separate Payback Period and 25-Year Net Savings results use the full financial projection. Currency values are formatted to whole U.S. dollars, energy quantities to whole kWh, solar offset to a whole percentage, and CO2 offset to one decimal place.

Frequently Asked Questions

How much can solar panels save in Texas?

Potential solar savings depend on installation cost, electricity usage, system size, retail electricity prices, export compensation, and entered incentives. The calculator estimates annual benefits over 25 years and subtracts net installation cost. Actual results can differ from the projection because electricity plans, solar production, and expenses may change.

How does the Texas solar payback calculator determine break-even time?

It adds each year’s modeled financial savings until the cumulative amount equals or exceeds the net system cost. The first year when that happens is the reported payback period. The result is shown in whole years. If payback does not occur during the 25-year projection, the calculator displays “25+ Years.”

Does Texas have a single solar net metering rate?

The calculator’s notes indicate that electricity export compensation varies by provider and market. It does not apply a single Texas-wide tariff. Instead, you enter an Export Credit ($/kWh) value that determines the modeled value of solar electricity sent to the grid.

Does the calculator include Texas solar tax incentives?

Yes. It includes editable federal credit, state credit, upfront rebate, and annual property tax savings inputs. The credit percentages default to 0%, while annual property tax savings defaults to $100. The calculator applies entered values mathematically but does not determine eligibility, verify tax law, or calculate an individual’s property tax exemption.

Does battery storage change the savings estimate?

The battery storage or high daytime self-use checkbox does not directly change the result in the supplied code. To explore the value of using more solar electricity at home, adjust Daytime Self-Consumption (%). The model does not separately calculate battery purchase costs, storage capacity, charging losses, or battery performance.

Why can my solar offset exceed 100%?

Solar offset compares estimated first-year solar generation with estimated annual household electricity usage. A result over 100% means the modeled system produces more electricity annually than the household’s estimated consumption. It does not mean the home receives all its electricity directly from solar panels at every hour.

Are the 25-year solar savings estimates guaranteed?

No. The calculations depend on entered electricity prices, installation costs, incentives, and fixed production assumptions. Real savings may differ because of changes in buyback plans, maintenance expenses, equipment performance, taxes, and utility terms. The estimates are intended for preliminary financial planning, not as a guaranteed investment return.

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Texas Solar Savings Calculator