Utah Solar Savings Calculator

Calculate Utah solar costs, 2026 federal tax-credit status, Rocky Mountain Power export credit tariffs, property tax exemption, payback period, and 25-year savings.

Utah 2026 rules: Utah’s residential renewable energy tax credit has sunset, leaving no active state credit. The federal Section 25D credit ended for systems placed in service after December 31, 2025. Rocky Mountain Power enrolls new solar customers in export credit tariffs well below retail; legacy net metering customers remain grandfathered. Utah exempts residential solar from property tax.

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Estimates only. Verify utility rates, export tariff terms, property tax exemption, and federal tax status with your utility, installer, and tax professional.

What Is the Utah Solar Savings Calculator?

The Utah Solar Savings Calculator estimates the net installation cost, electricity production, payback period, and 25-year net savings of a residential solar system. It values electricity used directly at home and electricity exported to the grid, then compares accumulated financial benefits with the calculated cost of installation.

Homeowners can use the results to explore different solar system sizes, installation quotes, electricity rates, and utility export credit assumptions.

The calculator includes utility choices for Rocky Mountain Power, municipal providers, cooperatives, and other utilities. Its accompanying notes discuss export credit tariffs, older net metering arrangements, and Utah solar tax considerations.

The financial model assumes 1,600 kilowatt-hours (kWh) of first-year solar production per installed kilowatt (kW). It also assumes annual solar production declines by 0.5% and projects results over 25 years.

These results are estimates. They depend on the information you enter and do not guarantee future electricity savings, tax benefits, or investment returns.

How the Utah Solar Savings Calculation Works

The calculator estimates upfront installation cost, subtracts entered incentives, and calculates the financial value of solar electricity over time. It then determines when accumulated savings recover the initial cost and how much net savings remain after 25 years.

1. Calculate Gross Solar Installation Cost

Gross installation cost depends on the system’s power capacity and its installed price per watt. Since one kilowatt equals 1,000 watts, the formula is:

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

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

For example, an 8 kW solar system installed at $2.90 per watt has a gross cost of $23,200.

8\times1{,}000\times2.90=23{,}200

2. Calculate Net System Cost After Incentives

The calculator subtracts the entered federal credit percentage, Utah state credit percentage, and upfront rebates from the gross installation cost.

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

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

Both percentage credits are calculated using the original gross installation cost. The calculator prevents net system cost from falling below zero.

The federal and Utah state credit fields both default to 0%. The calculator’s 2026 notes state that Utah’s residential renewable energy tax credit has ended and that the residential federal Section 25D credit ended for systems placed in service after December 31, 2025.

The credit fields are still editable, but entering a positive percentage does not mean the calculator has confirmed your eligibility for that incentive.

3. Estimate Annual Household Electricity Usage

The calculator estimates annual household electricity consumption from the monthly electric bill and retail electricity rate.

U=\frac{12B}{r}

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

For example, a monthly bill of $105 and an electricity rate of $0.115 per kWh give approximately 10,957 kWh of annual electricity usage.

U=\frac{105\times12}{0.115}\approx10{,}957\text{ kWh}

Use a positive electricity rate for a meaningful estimate. Although the input field permits zero as its minimum value, the calculation does not include a separate division-by-zero safeguard.

4. Estimate Annual Solar Electricity Production

The calculator assumes each installed kilowatt produces 1,600 kWh during the first year. It reduces estimated output by 0.5% each following year.

P_y=1{,}600S(0.995)^{y-1}

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

For an 8 kW system, estimated first-year production is 12,800 kWh.

P_1=8\times1{,}600=12{,}800\text{ kWh}

The calculator distributes annual production across 12 months using fixed seasonal percentages. Its largest monthly shares are assigned to June and July, at 19% each. This monthly pattern is used to divide electricity between direct household consumption and grid exports.

5. Calculate Self-Consumed and Exported Solar Electricity

Solar electricity used directly in the home is valued differently from electricity exported to the grid. The calculator estimates both quantities for each month.

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})

In these formulas, Q is monthly solar production, s is the entered daytime self-consumption percentage, H is solar electricity used directly at home, and X is exported electricity.

The calculator limits directly consumed solar electricity to estimated monthly household usage. Remaining production is treated as exported electricity.

Self-consumed electricity receives the entered retail electricity rate in the calculation. Exported electricity receives the separately entered Export Credit ($/kWh) rate.

6. Calculate Annual Financial Savings

Annual financial savings combine the value of electricity used directly at home and electricity exported to the grid. The calculator subtracts annual utility solar fees and adds entered annual property tax savings.

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

Where:

A = Annual financial savings in dollars
H = Solar electricity consumed directly at home
X = Solar electricity exported to the grid
r = Retail electricity rate
e = Entered export credit rate
F = Annual utility solar fees
T = Entered annual property tax savings

The calculator increases both the retail electricity rate and export credit rate by the entered Annual Utility Rate Increase percentage each year. It keeps annual fees and property tax savings constant throughout the projection.

7. Calculate Solar Payback Period

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

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

This formula applies when a payback year exists within the 25-year projection. If net cost is zero, the calculator displays “Immediate.” If accumulated savings do not recover net cost within 25 years, it displays “25+ Years.”

8. Calculate 25-Year Net Savings

The calculator adds 25 years of estimated financial benefits and subtracts net installation cost.

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

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

9. Calculate Solar Offset and CO2 Offset

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

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

If annual household usage is zero or less, the calculator assigns a solar offset of 0% instead of using this division.

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

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

Worked Example: An 8 kW Solar System in Utah

Consider a hypothetical Utah solar installation using the calculator’s default values.

Calculator Input	Example Value
Monthly Electric Bill	$105
Electricity Rate	$0.115/kWh
System Size	8 kW
Installed Cost per Watt	$2.90
Export Credit	$0.050/kWh
Daytime Self-Consumption	30%
Annual Utility Rate Increase	3%
Annual Utility Solar Fees	$0
Federal Credit	0%
Utah State Credit	0%
Upfront Rebates	$0
Annual Property Tax Savings	$100

Step 1: Calculate installation cost. An 8 kW system contains 8,000 watts. At $2.90 per watt, gross installation cost is $23,200.

Step 2: Apply entered incentives. Both tax credit percentages and upfront rebates are set to zero, so net installation cost remains $23,200.

Step 3: Estimate electricity production. Multiplying 8 kW by 1,600 kWh gives 12,800 kWh of estimated first-year solar generation.

Step 4: Calculate direct consumption and exports. With 30% self-consumption, the model allocates 3,840 kWh of first-year production to household use and 8,960 kWh to exports.

Step 5: Calculate first-year financial benefits. Directly used electricity is worth 3,840 × $0.115 = $441.60. Exports are worth 8,960 × $0.05 = $448. Adding $100 in entered annual property tax savings gives $989.60 in first-year modeled financial benefits.

Step 6: Project future savings. The calculator applies a 3% annual electricity rate increase and 0.5% annual production decline over 25 years.

Calculated Result	Estimated Value
Gross System Cost	$23,200
Net System Cost	$23,200
Year 1 Production	12,800 kWh
Estimated Annual Usage	10,957 kWh
Solar Offset	117%
Calculated First-Year Financial Benefits	$989.60
Payback Period	20 Years
25-Year Net Savings	$9,628
25-Year CO2 Offset	135.7 tons

The model calculates approximately $32,828 in financial benefits over 25 years. After subtracting the $23,200 net installation cost, estimated 25-year net savings are approximately $9,628.

These figures demonstrate how the calculator works. They are not guaranteed savings, recommended system specifications, or confirmed financial benefits for a particular Utah property.

How to Use the Utah Solar Savings Calculator

Enter Monthly Electric Bill ($): Provide your approximate monthly electricity expense.
Enter Electricity Rate ($/kWh): Use a positive retail electricity rate from your utility bill.
Enter System Size (kW): Specify the proposed residential solar system capacity.
Enter Installed Cost per Watt ($): Provide the installation price per watt from your solar quote.
Select Your Utility: Choose Rocky Mountain Power, Municipal (Provo, Logan), Cooperative (Garkane), or Other Utility.
Enter Export Credit ($/kWh): Provide the rate you want to use for electricity sent to the grid.
Adjust Daytime Self-Consumption (%): Enter a percentage from 0% to 100% for solar electricity expected to be used directly at home.
Enter Annual Utility Rate Increase (%): Choose an assumed annual increase between 0% and 50%.
Enter Annual Utility Solar Fees ($): Include relevant recurring annual utility charges.
Review the Battery Option: The form includes a checkbox labeled “Battery storage or high daytime self-use.”
Adjust Incentives: Review Direct Federal Credit (%), Utah State Credit (%), Upfront Rebates ($), and Property Tax Savings ($/yr).
Click Calculate Savings: Review the net cost, payback period, 25-year net savings, production estimates, and environmental impact.
Click Reset: Restore the default inputs and clear the displayed results before another calculation.

The utility selection and battery checkbox do not directly change the calculations in the supplied code. To model different export compensation or daytime solar use, change the Export Credit and Daytime Self-Consumption numerical inputs.

Important Factors That Affect Utah Solar Savings

Rocky Mountain Power Export Credit Tariffs

The calculator’s 2026 notes describe different electricity export arrangements for Rocky Mountain Power customers. They distinguish newer export credit tariffs from older, grandfathered net metering arrangements.

The calculation does not automatically determine which tariff applies to your home. It simply values exported electricity using the entered Export Credit ($/kWh) rate.

The default export credit is $0.05 per kWh, compared with a retail electricity rate of $0.115 per kWh. Because the two rates differ, the share of solar generation used directly at home can strongly affect estimated savings.

Daytime Self-Consumption

Self-consumption means using electricity from solar panels directly in your home instead of exporting it to the grid.

When the export credit is below the retail electricity rate, using a greater share of solar production directly can increase modeled savings. However, the calculator limits direct solar consumption to estimated monthly household usage.

The battery storage checkbox does not independently change this percentage. A different self-consumption assumption must be entered manually.

Utah Property Tax Savings

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

The calculator adds the entered amount to financial savings each year. It does not calculate the property’s assessed value, applicable tax rates, or the amount of any actual exemption.

Use a property tax savings amount only when you have a reasonable basis for that assumption. The default $100 is an input value, not a benefit the calculator has independently verified.

System Size and Installation Cost

Increasing system size raises both gross installation cost and estimated solar production. The cost per watt determines how much the additional capacity costs.

A larger installation does not automatically produce a shorter payback period. The result also depends on the amount of electricity valued at the retail rate, the amount exported, and the applicable export credit.

Future Electricity Rates and Solar Production

The calculator defaults to a 3% annual utility rate increase. It applies this increase to both retail electricity rates and export credits throughout the projection.

At the same time, solar production decreases by 0.5% each year. Higher assumed electricity prices generally increase future financial benefits, while lower solar generation reduces the amount of electricity available to use or export.

Actual results may differ because of weather, shading, roof orientation, equipment performance, maintenance expenses, and changes in utility tariffs. The calculator does not provide separate inputs for these conditions.

Understanding the Displayed Results

Three result labels in the supplied calculator code do not fully match the underlying values displayed.

Net Year 1 Savings: This row displays positive 25-year net savings, or $0 when the 25-year result is negative. It does not show the actual first-year financial benefit.
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 from year 25 rather than year one.

With the default inputs, the self-use and export rows display approximately 3,405 kWh and 7,944 kWh. The actual calculated first-year amounts are 3,840 kWh and 8,960 kWh. The row labeled Net Year 1 Savings displays $9,628, which is the positive 25-year net savings result, rather than the first-year financial benefit of $989.60.

The separate Payback Period and 25-Year Net Savings results follow the full financial projection. Currency results 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 Utah?

Potential savings depend on installation cost, solar system size, electricity prices, export credit rates, and entered incentives. The calculator estimates 25 years of financial benefits and subtracts the calculated net system cost. Actual savings may differ because of changes in utility tariffs, solar generation, and household electricity expenses.

How long does it take for solar panels to pay for themselves in Utah?

The calculator reports the first whole year when accumulated estimated savings equal or exceed net installation cost. It checks up to 25 years. If the cost is not recovered during that period, the displayed result is “25+ Years.” With its default values, the calculator estimates a payback period of 20 years.

How does Rocky Mountain Power’s export credit affect solar savings?

The export credit determines how much financial value the calculator assigns to solar electricity sent to the grid. The calculator’s notes describe different arrangements for newer and grandfathered Rocky Mountain Power customers. However, it does not identify the tariff for a particular account. You must enter the rate you want to model.

Does the Utah solar calculator include tax incentives?

Yes. It includes editable federal and Utah state credit percentages, upfront rebates, and annual property tax savings. Both tax credit percentages default to 0%, while annual property tax savings defaults to $100. The calculator applies these values mathematically but does not verify tax eligibility or calculate an individual’s actual property tax benefit.

Does battery storage change the solar savings estimate?

The battery storage or high daytime self-use checkbox does not directly affect the calculation. You can explore greater direct solar consumption by adjusting the Daytime Self-Consumption (%) field. Battery installation cost, storage capacity, charging losses, and battery performance are not separately modeled.

Why can my solar offset percentage exceed 100%?

Solar offset compares estimated first-year solar electricity production with estimated annual household electricity usage. A result above 100% means the modeled system generates 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 calculation depends on entered electricity rates, installation costs, financial incentives, and fixed production assumptions. Actual outcomes can differ because of changing utility terms, equipment performance, maintenance costs, taxes, and other expenses. The estimates are intended for preliminary planning rather than guaranteed investment returns.

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Utah Solar Savings Calculator