Toshiba Corp. said Monday its subsidiary's microchip-making factory in Kitakami, Iwate Prefecture, resumed part of its operations after they were suspended due to the March 11 mega-quake.

Iwate Toshiba Electronics Co. had planned to restart the manufacturing on April 11, but it postponed it in light of numerous aftershocks, Toshiba said.

Meanwhile, Toshiba said it plans to set a long summer-vacation time frame from mid-June to the end of September, during which its offices and factories will take turns in taking summer holidays, in a bid to cut the Toshiba group's overall power consumption.

Factories will shift parts of their operating hours to nighttime and holidays to disperse their electricity consumption, while Toshiba is also considering temporarily relocating its production bases outside the service areas of Tokyo Electric Power Co. and Tohoku Electric Power Co., it said.