Solar Panel CO2 Savings Calculator
Calculate how much CO2 your solar panels offset each year.
Find your carbon footprint reduction and lifetime emissions saved.
Solar panels generate electricity with no direct CO2 emissions. Every kWh of solar power displaces a kWh that would otherwise come from the grid, which has an average carbon intensity depending on your country’s energy mix.
Formula: Annual CO2 saved (kg) = annual solar output (kWh) × grid carbon intensity (kg CO2 per kWh)
Grid carbon intensities (approximate, 2024):
- Poland / coal-heavy grid: 0.70–0.80 kg/kWh
- Germany: 0.38–0.45 kg/kWh
- France (nuclear-heavy): 0.05–0.08 kg/kWh
- UK: 0.22–0.28 kg/kWh
- US average: 0.38–0.42 kg/kWh
- US California: 0.20–0.25 kg/kWh
- Australia: 0.45–0.60 kg/kWh
Lifecycle note: Manufacturing solar panels produces roughly 20–50 g CO2 per kWh over the panel’s lifetime — about 10–20x less than natural gas and 20–40x less than coal. The carbon payback period for panels is typically 1–3 years.
Worked example: A 4 kW system in the UK producing 3,500 kWh/year at 0.25 kg CO2/kWh: Annual saving = 3,500 × 0.25 = 875 kg CO2/year Over 25 years = 21,875 kg = 21.9 tonnes of CO2 avoided
Equivalent actions:
- 875 kg CO2 ≈ driving 4,300 km in a petrol car
- 875 kg CO2 ≈ 2.3 return flights London–Edinburgh
- 875 kg CO2 ≈ planting and growing 40 trees for a year
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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