The Worldwatch Institute has a must read report entitled: "Powering the Low-Carbon Economy: The Once and Future Roles of Renewable Energy and Natural Gas." See http://www.worldwatch.org/natural-gas-sustainable-energy. Saya Kitasei is the author of the paper.
I will be dialoguing with her and other panelists today at the PennFuture Energy Conference in Camp Hill about the topic of her paper. It will be a lively, informative discussion. The panel begins at 9:15 and PCN will be televising live the panel and the entire conference that begins with an address by Senator Casey at 8:30.
Germany is moving to 35% renewables by 2022 and will be using gas to enable that shift. California gets about 55% of its power from gas and plans to be at about 30% renewables as well in 10 years.
Renewables and gas are becoming the dominant power sources in advanced economies.