TOKYO (Reuters) - Japan's steelmakers, the nation's biggest users of electricity, urged the early restart of nuclear power plants on Wednesday, fearing that potential power cuts and more costly electricity will further squeeze a sector reeling from the strong yen.

* Biggest power users worry over high power costs, powercuts * Says manufacturers' shift abroad to accelerate * Govt unclear about conditions on restarts (Adds details of cost impact on industries, paragraphs ...

* Biggest power users worry at high power costs, power cuts * Says manufacturers' shift to abroad to accelerate * Govt unclear about conditions on restarts (Adds company comment, background) TOKYO, Feb ...