Japan will depend on new coal technology that's more than twice the cost of traditional plants to meet its targets on reducing global warming pollution.

In a plan formally adopted earlier in July, Japan said it expects coal to generate about a quarter of the nation's electricity by 2030.

For Japan to meet this target and still meet its goal of reducing climate-warming gases, "every single one of the new coal-fired power plants has to have technology that reduces emissions," Joseph Jacobelli, an analyst at Bloomberg Intelligence, said by phone. "But that's easier said than done because that raises the costs."