New Mexico Solar Savings Calculator

Calculate New Mexico solar costs, 2026 federal tax-credit status, the 10% state tax credit, retail net metering, property tax exemption, payback period, and 25-year savings.

New Mexico 2026 rules: The federal Section 25D credit ended for systems placed in service after December 31, 2025. New Mexico offers a 10% state income tax credit capped at $6,000 with carryforward. Investor-owned utilities provide retail-rate net metering with annual true-up. Solar added value is exempt from property tax statewide.

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Estimates only. Verify utility rates, net metering true-up terms, state credit eligibility, property tax exemption, and federal tax status with your utility, installer, and tax professional.

What Is the New Mexico Solar Savings Calculator?

The New Mexico Solar Savings Calculator estimates how much a residential solar system could cost after selected credits and rebates, how much electricity it could generate, and how long it might take to recover its net cost. It also projects cumulative electricity-related savings over a 25-year period.

The calculator is designed for homeowners comparing the estimated installation cost with the long-term financial value of solar electricity. It considers electricity used directly in the home and electricity exported at an entered credit rate.

Its initial settings include an 8 kW solar system, an installed price of $3.00 per watt, a 10% New Mexico state credit assumption, and a 0% direct federal credit assumption. You can change these values to explore different scenarios.

The estimates are not installer quotes or determinations of tax-credit eligibility. Actual financial outcomes depend on installation costs, electricity production, utility arrangements, and available incentives.

How the New Mexico Solar Savings Calculation Works

The calculator first estimates installation cost and subtracts the selected financial incentives. It then calculates estimated electricity production and annual savings. Finally, it projects those savings over 25 years to determine payback and net savings.

1. Calculate the Gross Solar System Cost

Solar system capacity is entered in kilowatts (kW), while installation cost is entered in dollars per watt. Since one kilowatt equals 1,000 watts, the formula is:

\text{Gross Cost}=\text{System Size (kW)}\times1000\times\text{Cost per Watt}

For example, an 8 kW system at $3.00 per watt has a gross cost of:

8\times1000\times\$3.00=\$24,000

2. Subtract Tax Credits and Rebates

The calculator subtracts the entered federal credit percentage, state credit percentage, and upfront rebate from the gross system cost.

\text{Federal Credit}=\text{Gross Cost}\times\frac{\text{Federal Credit Rate}}{100}

\text{State Credit}=\min\left(\text{Gross Cost}\times\frac{\text{State Credit Rate}}{100},6000\right)

The state credit calculation uses a maximum of $6,000 whenever the entered state credit percentage is positive. The default percentage is 10%, but it is editable.

\text{Net Cost}=\max(0,\text{Gross Cost}-\text{Federal Credit}-\text{State Credit}-\text{Rebates})

For the $24,000 example, a 0% federal credit, a 10% state credit, and no rebate give a state credit of $2,400 and a net system cost of $21,600.

The calculator treats the full calculated credit amounts as immediate reductions to net cost. It does not determine whether the homeowner qualifies for or can fully use those credits.

3. Estimate Electricity Usage and Solar Production

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

\text{Annual Usage (kWh)}=\frac{\text{Monthly Bill}\times12}{\text{Electricity Rate (\$/kWh)}}

For a $120 monthly bill and an electricity rate of $0.15 per kWh:

\text{Annual Usage}=\frac{120\times12}{0.15}=9,600\text{ kWh}

Annual solar production uses a fixed assumption of 1,700 kWh per installed kilowatt during the first year.

\text{Year 1 Production (kWh)}=\text{System Size (kW)}\times1700

An 8 kW installation therefore produces an estimated 13,600 kWh in the first year.

The calculator divides annual production into 12 months using fixed monthly percentages. It also assumes solar production decreases by 0.5% each year after the first year.

P_y=P_1\times(1-0.005)^{y-1}

Here, P_y is the estimated production in year y, and P₁ is first-year production.

4. Calculate Annual Electricity Savings

The calculator separates monthly production into electricity used at home and electricity exported.

Monthly self-consumption is the smaller of the entered self-consumption percentage of monthly solar production or estimated monthly household usage. Remaining production is treated as exported electricity.

\text{Self-Used kWh}=\min\left(\text{Monthly Solar kWh}\times\frac{\text{Self-Use \%}}{100},\text{Monthly Usage kWh}\right)

\text{Exported kWh}=\max(0,\text{Monthly Solar kWh}-\text{Self-Used kWh})

Self-used electricity is valued at the entered retail electricity rate. Exported electricity is valued at the entered export credit rate.

\text{Annual Savings}=\text{Self-Use Value}+\text{Export Value}-\text{Annual Fees}+\text{Property Tax Savings}

The calculator increases both the retail electricity rate and export credit rate by the selected annual utility rate increase. Annual utility solar fees and property tax savings remain fixed at their entered dollar amounts.

5. Estimate Payback and 25-Year Net Savings

The calculator adds estimated annual savings until the cumulative amount equals or exceeds the net system cost. The first year in which this happens is the displayed payback year.

If the net system cost is zero, the result displays “Immediate.” If cumulative savings do not recover the net cost within 25 years, the result displays “25+ Years.”

\text{25-Year Net Savings}=\sum_{y=1}^{25}\text{Annual Savings}_y-\text{Net System Cost}

The calculator also estimates a 25-year carbon dioxide offset by multiplying cumulative electricity production in megawatt-hours by 0.45 tons per megawatt-hour.

\text{CO}_2\text{ Offset (tons)}=\frac{\text{25-Year Production (kWh)}}{1000}\times0.45

Worked Example Using the Default Values

Consider the calculator’s default inputs: a $120 monthly electricity bill, a $0.15 per kWh rate, an 8 kW system costing $3.00 per watt, 30% daytime self-consumption, a $0.15 per kWh export credit, a 3.5% annual rate increase, and $100 in annual property tax savings.

Calculated Item	Estimated Result
Gross system cost	$24,000
Federal credit at 0%	$0
State credit at 10%	$2,400
Net system cost	$21,600
Annual electricity usage	9,600 kWh
First-year solar production	13,600 kWh
Calculated first-year savings	$2,140
Payback period	9 years
25-year net savings	$55,106
25-year CO2 offset	144.2 tons

These are hypothetical results based on the calculator’s formulas and default assumptions. The actual first-year savings calculation is $2,140, although the calculator’s visible row labeled “Net Year 1 Savings” currently uses a different value, as explained below.

How to Use the New Mexico Solar Savings Calculator

Enter your monthly electric bill. Enter the amount in dollars and your electricity rate in dollars per kWh. Use a positive electricity rate so the annual usage calculation is defined.
Enter the proposed system size and installed cost. Use kilowatts for system capacity and dollars per watt for the installation price.
Review the utility and energy settings. Select your utility, enter an export credit rate, and adjust daytime self-consumption. You can also enter an annual electricity rate increase and recurring solar utility fees.
Review the incentive fields. Enter the applicable federal and state credit percentages, any upfront rebates, and estimated annual property tax savings.
Calculate your estimate. Click “Calculate Savings” to display installation cost, estimated energy production, payback period, and 25-year financial results.
Compare different assumptions. Change the numerical inputs and calculate again, or click “Reset” to restore the initial values.

The form also contains a battery storage or high daytime self-use checkbox. However, the current calculation does not use the battery checkbox or utility selection to change numerical results. To model a different self-consumption pattern or export rate, change those numerical fields directly.

Understanding Your Solar Savings Results

The results show gross cost, calculated credits and rebates, net cost, energy estimates, the payback period, and 25-year net savings. Dollar amounts are displayed as rounded whole-dollar values. Energy totals are displayed as whole kilowatt-hours.

Net System Cost and Payback Period

Net system cost is the calculated amount remaining after the entered credits and rebates. The payback period indicates the first whole year in which cumulative estimated savings reach that amount.

A nine-year payback result means the model first recovers the net cost during year nine. It does not identify the exact month of recovery or guarantee a real-world return.

Solar Offset and 25-Year Savings

The solar offset percentage compares first-year solar production with calculated annual household electricity usage. It can exceed 100% because the calculation does not cap the ratio.

For example, 13,600 kWh of production divided by 9,600 kWh of annual consumption gives approximately 142%. This does not mean the home avoids 142% of its electricity bill. Self-consumption, exported electricity, and applicable credit rates are calculated separately.

The 25-year net savings result represents the sum of modeled annual benefits minus the net system cost. A negative result means projected benefits do not recover that cost during the 25-year period.

Important Display and Calculation Limitations

Three details in the current implementation are worth understanding before interpreting the displayed figures.

Year 1 self-use and export figures: Although these result rows are labeled “Year 1,” the code displays the values from the final year of its 25-year calculation loop. They are not the actual first-year totals.
Net Year 1 Savings: This row currently displays the 25-year net savings amount when positive, or $0 otherwise. It does not display calculated first-year savings.
Incentive and exemption badges: The state credit and property tax exemption badges do not check individual eligibility. The state credit result label also continues to reference 10% even if you change the input percentage.

The calculator does not separately estimate financing interest, equipment replacement costs, maintenance expenses, or the timing of tax-credit use. Its 25-year projection uses a fixed annual solar degradation rate and assumes the entered annual utility rate increase applies to both electricity and export credit rates.

Tax incentives and net metering arrangements may depend on system ownership, installation timing, utility rules, and eligibility requirements. The calculator’s 2026 tax and utility descriptions should be treated as built-in assumptions rather than independently verified legal or utility determinations.

Frequently Asked Questions

How much electricity can an 8 kW solar system produce in New Mexico?

Using this calculator’s assumption of 1,700 kWh per installed kilowatt, an 8 kW system produces an estimated 13,600 kWh during the first year. Actual solar production may vary with location, shading, panel orientation, weather, and equipment performance. The calculator applies 0.5% annual production degradation after the first year.

Does the calculator include a New Mexico solar tax credit?

Yes. The calculator starts with a 10% state credit assumption and applies a $6,000 maximum credit amount. You can change the percentage, but the cap still applies to positive state credit calculations. The tool does not verify program eligibility, whether a credit can be claimed, or how unused credits may be carried forward.

Does the calculator include a federal solar tax credit?

It includes an editable federal credit percentage, initially set to 0%. The calculator’s accompanying text describes the residential Section 25D credit as unavailable for systems placed in service after December 31, 2025. However, it does not evaluate tax eligibility or automatically select a percentage from an installation date. Verify applicable tax treatment before using a nonzero credit.

How does net metering affect solar savings?

The calculator values exported electricity using the export credit rate you enter. Electricity consumed directly in the home uses the retail electricity rate instead. A higher export credit can increase modeled savings when the system exports energy. The calculator does not separately simulate monthly credit balances or annual net metering settlements.

Does selecting PNM, Xcel Energy, El Paso Electric, or a cooperative change the result?

No. These utility names are available in the dropdown menu, but the calculation does not change based on the selected utility. The numerical electricity and export credit rate fields determine the values used in the savings calculation. Enter the rates you want the model to assume.

How does the calculator determine solar payback?

Solar payback is the first year in which cumulative modeled savings equal or exceed net system cost. Savings include the calculated value of self-used electricity, exported electricity, and entered property tax savings, minus annual solar utility fees. The result is measured in whole years, with a maximum projection period of 25 years.

Are the 25-year solar savings guaranteed?

No. The 25-year savings figure is a projection based on fixed formulas and user-entered assumptions. Actual savings can differ because of electricity rates, solar production, maintenance, export compensation, tax eligibility, and other expenses. The model is useful for comparing scenarios, but it is not a guarantee of financial performance.

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