TOKYO — A group of 17 trading, power and gas companies, as well as George Soros’s Soros Capital Management, will invest 5 billion yen ($32 million) in a Japanese startup operating an online electricity exchange, Nikkei has learned, in an effort to smooth out wholesale prices and help small power retailers compete.

The startup, Enechain, runs a platform connecting power producers that are selling electricity with power retailers looking to buy. More than 250 companies use the exchange.

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