Last Updated: February 2026
Your Clean Energy Home Hub
16 free, data-driven calculators for solar panels, electric vehicles, heat pumps, water heaters, IRA rebate eligibility, and home electrification — built with the latest EIA, DOE, and NREL data.
Frequently Asked Questions
- Contractors are experts at selling, but data is the expert at saving. Our 16 tools use objective, third-party data from the EIA, DOE, and NREL to give you an unbiased look at your potential ROI — before you ever sign a contract. No sales pitches, just the math.
- Every calculator on CleanEnergyCalc is 100% free with no registration, no email required, and no hidden paywalls. We believe that every American homeowner deserves access to unbiased, data-driven tools when making major energy investments — whether that's a $25,000 solar panel system, a $45,000 electric vehicle, or a $5,000 heat pump upgrade. Our tools are powered by publicly available government data from the EIA, DOE, and NREL, so you get transparent results based on real numbers — not marketing estimates. We plan to sustain this site through advertising and optional affiliate partnerships with vetted installers, but your calculator experience will always remain free and ad-light.
- Our calculators use the same authoritative data sources that professional energy consultants rely on. Solar production estimates are based on NREL irradiance data for your specific state, electricity costs come from the latest EIA residential rate data (updated monthly), and EV efficiency figures reflect real-world EPA ratings. That said, every home and driving situation is unique — factors like roof shading, local utility rate structures, and personal driving patterns can shift results by 10–20%. We recommend using our tools as a reliable starting point for comparison shopping, then getting 2–3 professional quotes to finalize your decision. Try our Solar ROI Calculator or EV vs Gas Calculator to see how the numbers work for your situation.
- The 30% federal solar Investment Tax Credit (ITC) under Section 25D expired on December 31, 2025 for homeowner-owned residential systems. If your system was installed and placed in service by that date, you can still claim the credit on your 2025 tax return — and any unused credit can be carried forward. For 2026 installations, the federal residential credit is no longer available for homeowner-purchased systems. However, third-party owned systems (solar leases and PPAs) may still qualify for the Section 48E Clean Electricity Investment Tax Credit through 2027. Many state-level incentives, utility rebates, and IRA rebate programs like HOMES and HEEHRA remain active. Use our IRA Rebate Eligibility Tool to check which incentives you still qualify for, and our Solar Payback Calculator to see updated break-even timelines without the federal credit.
- Combining rooftop solar with an electric vehicle is one of the most powerful money-saving strategies available to homeowners. When you charge your EV at home using solar energy, you're essentially driving on free fuel generated by your own roof. A typical American household that installs a 7–8 kW solar system and drives an EV 12,000 miles per year can save $2,500 to $4,500 annually compared to paying for grid electricity and gasoline separately. The savings multiply over time — a 25-year solar system paired with two EV ownership cycles can generate $80,000 or more in cumulative savings. Our Solar + EV Savings Calculator models this exact scenario using your state's electricity rates, local solar production, and your specific EV model. You can also use the Green Home Dashboard to see how solar, EV, and battery storage work together as a unified energy system.
16 Free Calculators
Every tool you need to evaluate the clean energy lifestyle — solar, EVs, heat pumps, electrification & IRA rebates. All free, no sign-up required.
Solar Calculators
5 tools to model your rooftop solar investment
Popular
Solar ROI Calculator
Calculate the return on investment for a rooftop solar installation based on your location, usage, and system size.
System Size Calculator
Find the ideal solar panel system size for your home based on your monthly electricity bill and location.
Payback Period Calculator
Estimate how many years until your solar panels pay for themselves after incentives and energy savings.
Battery Storage Calculator
Determine the right battery backup capacity for energy independence, outage protection, and time-of-use optimization.
Degradation Tracker
Project your solar panel output over 25 years using manufacturer degradation curves and local irradiance data.
EV Calculators
5 tools for electric vehicle costs and planning
Popular
EV vs Gas Calculator
Compare the true 5-year total cost of ownership between an EV and a comparable gas vehicle, including fuel and maintenance.
Charging Cost Calculator
Calculate your monthly home charging costs by EV model, state electricity rate, and driving habits.
Charger Installation Cost
Estimate the cost to install a Level 2 home EV charger, including equipment and electrician labor by state.
Battery Degradation Calculator
Project your EV battery capacity loss over time using real-world degradation data by model and climate.
Road Trip Planner
Plan an EV road trip with charging stop estimates, time projections, and cost comparisons vs. driving a gas car.
Combined Tools
3 tools that integrate solar + EV for maximum savings
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Solar + EV Savings
Model your combined annual savings when you charge your EV at home using solar energy — the ultimate clean energy stack.
Rate Optimizer
Find the best time-of-use electricity rate plan for your utility based on your EV charging and solar export schedule.
Green Home Dashboard
Combine solar production, EV charging, battery storage, and utility rate data into one unified savings overview.
Heat Pump & Electrification Suite
3 new tools for home heating, water heating, and IRA incentive planning
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Heat Pump vs. Gas Calculator
Compare the true 20-year cost of a heat pump against a gas furnace or boiler — including state HEEHRA rebates, local gas & electricity rates, and CO₂ savings.
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Heat Pump Water Heater ROI
Calculate savings from switching to a heat pump water heater versus a gas or electric resistance tank. Includes state HEEHRA rebate eligibility.
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IRA Rebate Eligibility Tool
Discover which Inflation Reduction Act incentives you qualify for — HEAR/HEEHRA point-of-sale rebates and HOMES savings rebates (still active). Federal 25C credits expired Dec 31, 2025.
Why Trust Our Data?
Every calculator is built on authoritative, publicly available government data sources.
US EIA
Electricity rates, consumption data, and energy statistics from the US Energy Information Administration — updated monthly.
Visit eia.govUS DOE
Federal incentive data, EV battery research, and home energy efficiency standards from the Department of Energy.
Visit energy.govNREL
Solar irradiance, peak sun hours by location, and system performance data from the National Renewable Energy Laboratory.
Visit nrel.govAll calculations use US EIA February 2026 residential electricity rates.Last Updated: February 2026