From 2025 the roofs of all new houses in Tokyo

From 2025, the roofs of all new houses in Tokyo will be equipped with solar panels

The Tokyo metropolitan area government has announced a new policy requiring the installation of solar panels on some of its new homes as part of a measure to encourage the use of solar energy. The initiative is scheduled to start in 2025 and will be the first of its kind in Japan, according to The Japan News.

    Governor Yuriko Koike //Image source: The Yomiuri Shimbun

Governor Yuriko Koike //Image source: The Yomiuri Shimbun

About 50 developers constructing buildings with a total area of ​​at least 20,000 m will fall under the new regulations requiring the installation of solar panels2 In the year.

However, the proportion of solar panels required for installation varies from area to area, taking into account the level of solar radiation in a given location. For example, if in Chiyoda and Chuo districts, where there are many tall buildings, 30% of the roofs need to be covered with panels, then in low-rise areas – up to 85%. Since the life cycle of the panels is in the order of 20 to 30 years, the district government will also set up a system to promote their recycling in order to prepare for a mass replacement of panels in the future. Panel leasing is not excluded, as are homebuyer subsidies and other benefits.

According to the publication, some developers are voicing concerns about additional costs that can increase housing costs. In response, with the launch of the program, the authorities promise to step up support measures.

From spring 2025, new homes across the country must meet certain energy-saving standards — for example, builders must use materials with high thermal insulation. The municipalities have decided to start their solar initiative at the same time as the implementation of national standards to make it easier for builders.

Tokyo Governor Yuriko Koike said she hopes the new initiative will mark a turning point in history, after which it can be said that “Tokyo has changed.”

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