Japan has no space for solar farms — so it's building them on water.
Land is scarce and expensive in Japan. Mountains cover nearly 75% of the country. Urban density is extreme. There simply isn't room for the vast ground-mounted solar farms that nations like India and China deploy across open plains.
Japan's solution: float them. Floating solar — or "floatovoltaics" — involves mounting solar panels on buoyant structures on reservoirs, irrigation ponds, hydropower lakes, and now, coastal marine environments. Japan has become the world leader in this technology, operating more floating solar installations than any other country.
The Yamakura Dam reservoir in Chiba Prefecture hosts one of Japan's largest floating solar arrays — over 50,000 panels covering 180,000 square meters of water surface. It generates enough electricity to power nearly 5,000 homes annually.
Floating solar offers advantages beyond land savings. Water has a natural cooling effect on panels, improving efficiency by 5-15% compared to ground-mounted systems. The panels reduce evaporation from reservoirs — critical in a country where water resource management matters. And shade from panels reduces algae growth in reservoirs, improving water quality.
Japan is now pushing into offshore floating solar — anchoring large arrays in sheltered coastal bays and testing marine-grade floating platforms that can withstand ocean conditions. NEDO, Japan's national energy research agency, is funding pilot programs combining offshore floating solar with offshore wind on shared platforms.
When you have no land, you innovate. Japan always does.
New Energy and Industrial Technology Development Organization, Japan — 2024
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