TOKYO—Toyota Motor Corp. on Wednesday accelerated plans to introduce its first hydrogen-powered car, saying it now would begin selling a sedan in less than a year at a price of about $70,000.

Toyota had previously said it would roll out the car "around 2015" at a price of up to $100,000. On Wednesday, the auto maker said it would begin sales in Japan by March 2015 as the Japanese government seeks to boost the economy through the development of hydrogen fuel-cell technology.

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