Japan's Ministry of the Environment announced a draft of "Long-term Low-carbon Vision" Jan 19, 2017.
To achieve the goal of "reducing greenhouse gas emissions by 80% by 2050," the ministry announced its long-term plans to "increase the ratio of low-carbon power sources including renewable energy to 90% or higher." Also, it said that carbon price, which prices carbon dioxide emissions, such as carbon tax and emissions trading is effective.
Those plans were compiled after 10 discussions in meetings of the Long-term Carbon Vision Subcommittee, Global Environment Section, Central Environmental Council, which lasted for half a year.
The Paris Agreement, an international framework against global warming, clearly mentions the goal of reducing greenhouse gas emissions to practically zero in the world as a whole by the latter half of this century. And Japan has a goal of reducing greenhouse gas emissions by 80% by 2050.
In the latest meeting of the subcommittee, industrial/social structures and policies aimed at drastically reducing greenhouse gas emissions by 2050 were discussed.
As for the ratios of power sources, the ministry clarified the numerical goal of providing more than 90% of the energy generated in Japan by using three low-carbon power sources: renewable energy, thermal power with CCS (carbon dioxide capture/storage) and nuclear power.