Japan's real gross domestic product would fall by up to 5% by 2030 if the country phases out nuclear power and boosts renewable energy to 35% of its energy supply by that year, a draft report by a government panel showed Monday.

The panel has been considering scenarios for the future of the country's energy mix since last year, after the Fukushima Daiichi accident raised doubts over Japan 's long-term plan to increase its dependence on nuclear power.

The report also considers a separate scenario to phase out nuclear power more slowly, by 2050, in which real GDP is forecast to fall by as much as 4.1% by 2030, when 15% of the country's energy mix would still be supplied by nuclear power.

The draft also includes scenarios to settle at a lower level of nuclear power generation capacity and maintain the current level of nuclear capacity-- with real GDP expected to fall by as much as 3.6% and 2.5%, respectively, in each scenario.

The panel is expected to finish its discussions on Thursday and submit four or five scenarios to the Cabinet. Prime Minister Yoshihiko Noda and other ministers have said they will decide on Japan 's future energy mix by this summer.

Since the No. 3 unit at the Tomari nuclear power plant on Japan 's northernmost island of Hokkaido was closed on May 5 for a planned checkup, no nuclear reactors have been generating power in the country. Before the Fukushima accident, nuclear power produced about 30% of Japan 's electricity.

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