Japan remains optimistic about the adoption of renewable energy despite Mitsubishi pulling out of three big offshore wind projects, the government said Thursday.

Blaming high costs, Mitsubishi said Wednesday it was exiting the projects, which planned 134 turbines to generate power for more than a million homes.

"The government regards offshore wind power as an important source of electricity towards making renewable energies (Japan's) main source of electricity, regardless of success or failure of a particular project," government spokesman Yoshimasa Hayashi told reporters.

The government "will further examine the issue, including reviewing conditions of the auction system, after examining factors behind the withdrawal from these projects," he added.

Japan declared in its updated energ

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