Tokyo to Mandate Rooftop Solar Panels on New Homes
December 17th, 2022

Via Yale’s e360, an article on Tokyo recent decision to mandate that all new homes in the city be built with rooftop solar panels starting in 2025:

Tokyo is mandating that all new homes in the city be built with rooftop solar panels starting in 2025.

Tokyo is the first Japanese city to require rooftop solar on new homes. The mandate, which goes into effect in April of 2025, applies to roughly 50 large construction companies, which will be required to install solar arrays on homes with up to 2,000 square meters of floor space.

Since the 2011 Fukushima nuclear disaster, Japan has dramatically scaled down emissions-free nuclear power, turning instead to heavily polluting coal. Local leaders hope a buildout of rooftop solar will help clean up the power grid.

Tokyo is aiming to cut emissions in half by 2030, and households account for 30 percent of the city’s energy use, The Japan Times reports. But just 4 percent of Tokyo buildings suitable for rooftop solar are currently equipped with solar arrays, Reuters reports.

“In addition to the existing global climate crisis, we face an energy crisis with a prolonged Russia-Ukraine war,” Risako Narikiyo, a member of the regional political party Tomin First no Kai, told the city assembly. “There is no time to waste.”


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About This Blog And Its Author
As potential uses for building and parking lot roofspace continue to grow, unique opportunities to understand and profit from this trend will emerge. Roof Options is committed to tracking the evolving uses of roof estate – spanning solar power, rainwater harvesting, wind power, gardens & farms, “cooling” sites, advertising, apiculture, and telecom transmission platforms – to help unlock the nascent, complex, and expanding roofspace asset class.

Educated at Yale University (Bachelor of Arts - History) and Harvard (Master in Public Policy - International Development), Monty Simus has held a lifelong interest in environmental and conservation issues, primarily as they relate to freshwater scarcity, renewable energy, and national park policy. Working from a water-scarce base in Las Vegas with his wife and son, he is the founder of Water Politics, an organization dedicated to the identification and analysis of geopolitical water issues arising from the world’s growing and vast water deficits, and is also a co-founder of SmartMarkets, an eco-preneurial venture that applies web 2.0 technology and online social networking innovations to motivate energy & water conservation. He previously worked for an independent power producer in Central Asia; co-authored an article appearing in the Summer 2010 issue of the Tulane Environmental Law Journal, titled: “The Water Ethic: The Inexorable Birth Of A Certain Alienable Right”; and authored an article appearing in the inaugural issue of Johns Hopkins University's Global Water Magazine in July 2010 titled: “H2Own: The Water Ethic and an Equitable Market for the Exchange of Individual Water Efficiency Credits.”