The U.S. could nearly double its reliance on renewable energy in the next decade by building 10,000 miles of new transmission and taking other administrative actions under the incoming Biden administration, a study released by the American Wind Energy Association (AWEA) Wednesday said.

The effort would provide a major post-pandemic boost to the U.S. economy, the report by Wood Mackenzie and AWEA , which is merging into the American Clean Power Association on Jan. 1, concluded.

“Administrative action alone can enable a doubling of renewable energy penetration in the next decade,” from 19% to 37%, said John Hensley, vice president of research and analytics at AWEA. “Transmission-focused policies will really be critical and fundamental to unlocking renewable potential in this decade.”

Legislative action would be necessary to reach a more ambitious target of having half the grid powered by renewable resources by 2030. That scenario is less likely because of political divisions in the Congress and among state legislatures, but it would provide an even bigger economic boost, the study, “A Majority Renewables Future,” found.

“Reaching a majority [renewables] grid by 2030 will deploy over a trillion dollars in capital investment in the American economy while supporting nearly a million direct renewable energy jobs,” Hensley said. “It’ll also stabilize wholesale power prices, reduce U.S. carbon emissions by over 60% and all the while deliver tens of billions of dollars in state and local payments to governments and landowners.”

A key to the administrative-only 37% scenario would be building 10,000 miles of transmission infrastructure at a cost of $70 billion or more, the report said. The new pathways the study proposes would link wind power in Wyoming and New Mexico to California and connect offshore wind in New England to western portions of ISO-NE, NYISO and PJM, among other projects.

The study also proposed building massive amounts of storage and sending Southwest solar power where it is needed.

It did not specify who would pay for the projects.