NHK has learned that officials from the G7 nations are working to include numerical targets for renewable energy in their declaration to be issued at their summit.
A draft statement stresses that the introduction of clean energy needs to go much faster to achieve carbon neutrality.
The document includes a pledge that the G7 members will raise offshore wind-power generation six-fold and almost triple solar power generation by 2030 from current levels.
The wind-power figure is equivalent to the output of 180 large thermal-power stations, that for solar power 1,000 stations.
Host nation Japan hopes to agree with its partners to work together on technology to develop film-type solar panels.
The summit is also expected to adopt an action plan on the shift to clean energy. It would call for investments by the public and private sectors and creating sustainable supply chains.
But the members are believed to be divided over reducing dependence on coal-fired thermal power generation and CO2 emissions from automobiles.