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
EV Calculators
5 tools for electric vehicle costs and planning
Combined Tools
3 tools that integrate solar + EV for maximum savings
Heat Pump & Electrification Suite
3 new tools for home heating, water heating, and IRA incentive planning
Explore More Resources
Complementary tools and guides to support your clean energy journey.
Latest from the Blog
In-depth guides on solar, EVs, and clean energy incentives.
News & Policy
Clean Energy News: May 2026 — Record Grid Buildout, New Battery Tech, and Tax Credit Fight
The US is on track for a record 86 GW of new power capacity in 2026. Sodium-ion batteries are hitting commercial scale, and Republicans are moving to restore clean energy tax credits cut by the OBBBA. Here's what it means for homeowners and investors.
7 min read
Policy Updates
EV Tax Credits in 2026: Which Cars Still Qualify and How to Claim
Complete guide to the $7,500 federal EV tax credit in 2026. Understand income limits, MSRP caps, final assembly rules, and which electric vehicles still qualify. Updated rules and point-of-sale options for 2026.
11 min read
Solar Basics
Heat Pump vs Gas Furnace in 2026: Real Cost Comparison by Climate Zone
Compare heat pumps vs gas furnaces with real cost data by climate zone. Learn about COP ratings, HEEHRA rebates, installed costs, and payback periods. Updated 2026 pricing and incentives.
13 min read
Solar Basics
The Complete Home Battery Buying Guide 2026: Tesla Powerwall vs Enphase vs Franklin vs Sonnen
Comparing the top home batteries by capacity, cost per kWh, efficiency, warranty, and use cases. Tesla Powerwall, Enphase IQ Battery, Franklin WH, and Sonnen ecoLinx side-by-side specs and real-world performance for 2026.
12 min read
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Why Trust Our Data?
Every calculator is built on authoritative, publicly available government data sources.