Zero Carbon Zero Cost: Rooftop Solar Savings for Japanese Households

Zero Carbon Analytics reports on the economic benefits of rooftop solar for households, specifically simulating potential savings for Japanese homes in FY 2020. The report argues that while Japan has the lowest clean energy share among G7 nations, it has significant untapped potential for residential solar to reduce electricity costs and carbon emissions.

• In a simulation for the Japanese fiscal year 2020, households with rooftop solar panels would have saved nearly 135% compared to those without, resulting in a net benefit of JPY 37,422 (USD 353).
• The total financial benefit for a simulated Japanese household in FY 2020 was JPY 143,422 (USD 1,352), comprising JPY 48,115 (USD 454) in avoided grid electricity costs and JPY 95,307 (USD 899) from selling excess power via the feed-in-tariff (FiT).
• Japan currently has the lowest share of clean energy generation among G7 countries and the highest share of fossil fuel generation. In 2023, solar accounted for approximately 10% of electricity generation, hydroelectric for 7%, and wind for less than 1%.
• A study by the Renewable Energy Institute (REI) indicates that Japan could supply over 80% of its electricity from renewables by 2035, which would reduce annual overseas capital outflow for fossil fuels by approximately JPY 4 trillion (USD 28.4 billion).
• In the US, the Inflation Reduction Act's Residential Clean Energy Credit covers up to 30% of rooftop solar installation costs through at least 2034; in 2023, approximately 1.2 million households claimed this credit, totaling USD 6.3 billion.
• In the EU, rooftop solar installations grew significantly in 2022 in Germany (9%), Spain (106%), and Italy (240%), with model households in these countries saving up to EUR 2,935 (USD 3,090) in energy bills that year.
• In the UK, 1 million households with solar panels saved a total of GBP 800 million (USD 999 million) in 2023. The ECIU estimated that if peak installation rates from 2011 had been maintained, the UK would have saved an additional GBP 5.1 billion (USD 6.4 billion) in 2023.
• Starting in April 2025, new homebuilders in Tokyo will be required to install rooftop solar panels as part of the city's decarbonisation strategy.

APA

Team, Z. (2024). Zero Carbon Zero Cost: Rooftop Solar Savings for Japanese Households. Zero Carbon Analytics. https://zerocarbon-analytics.org/finance/zero-carbon-zero-cost-rooftop-solar-savings-for-japanese-households/

Chicago

Team, ZCA. Zero Carbon Zero Cost: Rooftop Solar Savings for Japanese Households. Zero Carbon Analytics, 2024. https://zerocarbon-analytics.org/finance/zero-carbon-zero-cost-rooftop-solar-savings-for-japanese-households/.

Wikipedia

{{cite report |last1=Team |first1=ZCA |title=Zero Carbon Zero Cost: Rooftop Solar Savings for Japanese Households |publisher=Zero Carbon Analytics |date=27 November 2024 |url=https://zerocarbon-analytics.org/finance/zero-carbon-zero-cost-rooftop-solar-savings-for-japanese-households/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{team2024zero, author = {Team, ZCA}, title = {{Zero Carbon Zero Cost: Rooftop Solar Savings for Japanese Households}}, institution = {Zero Carbon Analytics}, year = {2024}, month = nov, url = {https://zerocarbon-analytics.org/finance/zero-carbon-zero-cost-rooftop-solar-savings-for-japanese-households/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }