Sanyo Electric Co. will spend ¥6 billion to build a factory as part of plans to almost double output of solar batteries within the next two years.

The company plans to start operations by the end of 2010 at the plant, which will be built alongside an existing facility in Osaka, Sanyo said Monday.

The company said it plans to increase solar-battery output to 600 megawatts by the end of March 2011, from 340 megawatts at present.