Ruling party lawmakers proposed to Prime Minister Shinzo Abe on Tuesday that Japan generate around 60 percent of its electricity from stable sources, a figure that meets international standards but also suggests continued reliance on nuclear power.

The share of "base-load" power sources, which can generate electricity day and night at low cost and include coal and hydroelectricity, has fallen to around 40 percent thanks to the shutdown of all nuclear reactors since the March 2011 Fukushima disaster.

Under the proposal by the Liberal Democratic Party, nuclear power would take up a share of at least 20 percentage points among the various sources.