Colorado Solar Savings Calculator: 2026 Updated

Colorado Solar Savings Calculator

Calculate Colorado solar costs, 2026 federal tax-credit status, Xcel net metering, property tax exemption, payback period, and 25-year savings.

Colorado 2026 rules: No state income tax credit for solar. The federal Section 25D credit ended for systems placed in service after December 31, 2025. Investor-owned utilities such as Xcel Energy must offer retail net metering with annual true-up. Colorado exempts residential renewable energy equipment from property tax. High-altitude sun yields strong production.

Loading calculator…

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

What Is the Colorado Solar Savings Calculator?

The Colorado Solar Savings Calculator is a financial estimation tool for residential solar energy systems. It calculates the upfront cost of a solar installation, subtracts entered incentives, estimates annual electricity production, and projects the financial value of solar electricity over a 25-year period.

The calculator estimates how much a Colorado homeowner could save by generating solar electricity instead of purchasing all electricity from a utility. It considers system installation costs, electricity prices, solar production, self-consumption, export credits, annual utility rate increases, recurring solar fees, and entered property tax savings. Its main results are the estimated payback year and 25-year net savings.

The tool uses an annual solar production assumption of 1,550 kilowatt-hours (kWh) per kilowatt (kW) of installed capacity during the first year. It also assumes solar production decreases by 0.5% annually.

These results are projections based on the values entered and the calculator’s fixed assumptions. They are not guaranteed electricity production figures, installation quotes, or future financial returns.

How the Colorado Solar Savings Calculation Works

The calculator combines installation costs, incentives, estimated solar generation, electricity savings, and annual expenses. It calculates the initial investment first, then estimates savings for each of the following 25 years.

1. Calculate the Gross and Net Solar System Cost

The gross installation cost is the system capacity in kilowatts multiplied by 1,000 to convert it into watts, then multiplied by the installed cost per watt.

G=K\times1000\times W

Here, G is gross installation cost in dollars, K is solar system size in kW, and W is installed cost per watt in dollars.

The calculator subtracts the entered federal credit, state credit, and upfront rebates from the gross cost. Both percentage credits are calculated separately from the original gross installation cost.

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

In this formula, N is net system cost, f is the entered federal credit percentage, s is the entered state credit percentage, and R is the upfront rebate amount. The calculator does not allow its calculated net cost to fall below zero.

2. Estimate Annual Solar Electricity Production

First-year solar generation is estimated using 1,550 kWh for each kW of installed capacity.

P_1=K\times1550

For later years, the calculator applies a 0.5% annual production reduction:

P_y=P_1\times(0.995)^{y-1}

Here, P₁ is first-year production, Pᵧ is production in year y, and y represents the year of operation.

The annual production is distributed across the 12 months using fixed monthly percentages: 1%, 2%, 4%, 8%, 15%, 19%, 19%, 15%, 8%, 4%, 2%, and 3%. These percentages total 100%.

3. Calculate Self-Consumption and Export Credits

The calculator first estimates annual household electricity usage by dividing the yearly electric bill by the electricity rate.

A=\frac{12B}{U}

Here, A is estimated annual household electricity use in kWh, B is the monthly electric bill in dollars, and U is the electricity rate in dollars per kWh.

Each month, the calculator assigns part of solar production to household self-consumption. Self-used electricity is limited to the smaller of the entered self-consumption percentage of monthly solar generation or one-twelfth of estimated annual household usage.

D_m=\min\left(\frac{M_mq}{100},\frac{A}{12}\right)

X_m=\max(0,M_m-D_m)

Here, Mₘ is solar production during a particular month, q is the entered daytime self-consumption percentage, Dₘ is the solar electricity used at home, and Xₘ is the electricity treated as exported.

Self-consumed electricity is valued at the entered retail electricity rate. Exported electricity is valued at the entered export credit rate. The calculator increases both rates annually using the entered utility rate increase percentage.

4. Calculate Annual Savings and the Payback Period

For each year, the calculator adds the value of self-used and exported solar electricity, subtracts annual utility solar fees, and adds the entered annual property tax savings.

V_y=\sum_{m=1}^{12}\left(D_{y,m}U(1+i)^{y-1}+X_{y,m}E(1+i)^{y-1}\right)-F+T

In this formula, Vᵧ is the calculated savings for year y, E is the initial export credit per kWh, i is the entered annual utility rate increase expressed as a decimal, F is annual utility solar fees, and T is entered annual property tax savings. D and X represent that year’s monthly self-used and exported electricity.

The payback period is the first whole year in which accumulated annual savings equal or exceed the calculated net installation cost.

\sum_{y=1}^{n}V_y\ge N

The payback period is the earliest year n satisfying this condition. If the net cost is zero, the result is Immediate. If accumulated savings never recover the net cost within 25 years, the result is 25+ Years.

The calculator then subtracts the original net installation cost from all 25 years of calculated savings.

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

5. Worked Example Using the Default Values

Consider an 8 kW solar installation using the calculator’s default inputs: a $140 monthly electric bill, a $0.160/kWh electricity rate, a $2.95 installed cost per watt, 30% daytime self-consumption, a $0.160/kWh export credit, a 3.5% annual utility rate increase, and $100 in annual property tax savings. The federal credit, state credit, upfront rebates, and annual utility solar fees are set to zero.

\text{Gross Cost}=8\times1000\times2.95=\$23,600

\text{Year 1 Production}=8\times1550=12,400\text{ kWh}

Estimated annual household electricity usage is 10,500 kWh. In the first modeled year, 3,720 kWh of solar production is self-consumed, and 8,680 kWh is treated as exported.

With these assumptions, the first year’s calculated savings are $2,084, including the entered $100 property tax savings. Extending the calculation across 25 years, with annual electricity price increases and production degradation, produces a payback period of 10 years and approximately $51,069 in 25-year net savings.

These figures illustrate the calculation using hypothetical inputs. They do not represent an installation quote or a prediction of actual household savings.

How to Use the Colorado Solar Savings Calculator

Enter your monthly electric bill. Type your average monthly electricity expense in dollars under Monthly Electric Bill ($).
Enter your electricity rate. Provide the price paid per kWh in the Electricity Rate ($/kWh) field.
Set the system size and installation price. Enter System Size (kW) and Installed Cost per Watt ($).
Review your utility settings. Choose a utility category, then enter the Export Credit ($/kWh) and Daytime Self-Consumption (%). The numeric fields determine the calculated electricity value.
Enter future cost assumptions. Adjust Annual Utility Rate Increase (%) and Annual Utility Solar Fees ($).
Review incentives. Enter any applicable Direct Federal Credit (%), Colorado State Credit (%), Upfront Rebates ($), and Property Tax Savings ($/yr).
Calculate and review the results. Click Calculate Savings to display the cost breakdown, estimated payback period, 25-year net savings, and production figures.

You can select Reset to restore the calculator’s default form values and hide the previous results. Review your electricity rate, export credit, and installation cost carefully because these inputs directly affect the financial estimates.

Understanding Your Solar Savings Results

Gross System Cost and Net Cost

Gross System Cost is the estimated installation price before incentives. Net Cost is the amount remaining after the entered federal and state credit percentages and upfront rebates are deducted. This is the initial investment the calculator attempts to recover through projected savings.

Credit percentages are user-entered assumptions. The calculator does not independently check tax eligibility, legal requirements, incentive caps, or whether you can actually claim a particular credit.

Payback Period

The Payback Period shows the first year when cumulative calculated savings cover the net installation cost. Results appear as Immediate, a whole number of years, or 25+ Years. The accompanying meter compares the displayed payback year with the 25-year calculation period.

A shorter estimated payback period means the calculator projects earlier recovery of the initial investment. It does not guarantee that the system will achieve that result.

25-Year Net Savings

The 25-Year Net Savings result includes projected solar electricity value, entered property tax savings, and recurring utility solar fees over 25 years, with the net installation cost deducted once. A positive result means the modeled benefits exceed the initial net cost. A negative result means they do not.

The calculation uses an annual production degradation rate of 0.5% and applies the entered annual utility rate increase to both the retail electricity rate and export credit rate. It does not separately model financing interest, equipment replacement, or maintenance expenses beyond any amount included in the annual fees field.

Solar Production, Offset, and CO2 Impact

The Production and Impact section displays system size, estimated first-year solar generation, estimated annual household electricity usage, solar offset, and a 25-year CO2 offset estimate.

Solar Offset is calculated by dividing first-year solar production by estimated annual household electricity usage and multiplying by 100. Because this is a production-to-usage ratio, it can exceed 100%. It does not mean all generated electricity is consumed directly in the home.

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

For CO2 Offset, the calculator adds projected solar production across 25 years, converts kWh into thousands of kWh, and applies a fixed factor of 0.45 tons per 1,000 kWh.

\text{25-Year CO2 Offset}=\frac{0.45}{1000}\sum_{y=1}^{25}P_y

This is a simplified production-based environmental estimate rather than a measured emissions reduction.

Important Display and Input Limitations

Some displayed labels do not fully match the current calculation code. The rows labeled Year 1 Self-Use kWh and Year 1 Export kWh actually receive the quantities from the final simulated year, year 25. The row labeled Net Year 1 Savings displays the positive portion of the 25-year net savings figure, or $0 if that figure is negative, rather than the first year’s savings.

Also, selecting a different Utility option or checking Battery storage or high daytime self-use does not independently change the calculation. To model different export terms or household solar usage, change the Export Credit and Daytime Self-Consumption numeric fields.

The Retail Net Metering and Property Tax Exempt badges are displayed without checking the selected utility or confirming individual eligibility. Treat them as informational labels, not verified benefits.

Frequently Asked Questions

How much does an 8 kW solar system cost in Colorado?

Using the calculator’s default installed price of $2.95 per watt, an 8 kW solar system has an estimated gross cost of $23,600. The net cost may be lower if you enter applicable rebates or credits. Actual prices depend on the installation quote and the equipment and services included.

How many kWh will my solar panels produce each year?

The calculator assumes 1,550 kWh of first-year production per kW of installed solar capacity. For example, an 8 kW system produces an estimated 12,400 kWh during year one. It then reduces the annual production estimate by 0.5% for each following year. Actual output depends on sunlight, panel placement, shading, and system conditions.

Does the calculator include federal and Colorado solar tax credits?

Yes. It provides separate percentage fields for direct federal and Colorado state credits, both set to 0% by default. The calculator’s accompanying 2026 note states that the residential Section 25D credit ended for systems placed in service after December 31, 2025. The tool does not verify tax-credit eligibility or determine current tax law, so any changes to these fields should be based on independently verified information.

How does net metering affect estimated Colorado solar savings?

Net metering can affect the value of electricity your solar panels send to the grid. This calculator uses the export credit rate you enter for exported solar energy. The utility selection does not automatically apply a separate compensation schedule, monthly credit balance, or annual true-up settlement. Confirm your utility’s actual credit arrangements before relying on the estimate.

Does the calculator include Colorado property tax savings?

Yes. The Property Tax Savings ($/yr) field defaults to $100, and the calculator adds that amount to projected savings every year. The tool references Colorado’s residential renewable energy equipment property tax exemption, but it does not calculate an exemption’s value from your property assessment or check eligibility. Enter an amount supported by your circumstances.

Why can the solar payback period be longer than 25 years?

A result of 25+ Years means the calculator’s accumulated savings do not recover the net system cost within its 25-year projection. Higher installation costs, lower export credit rates, greater annual fees, or lower valued electricity production may contribute to that result. The tool does not calculate an exact payback year beyond year 25.

Does adding battery storage increase the calculated solar savings?

Checking the battery storage option alone does not change the calculated results. The calculator has no separate battery capacity, battery price, or charging and discharging model. You can adjust the daytime self-consumption percentage to examine a different self-use assumption, but this does not constitute a complete battery storage financial analysis.

Table of Contents