At the urging of the federal Department of Energy, the regional transmission organizations also looked at what transmission investments would be necessary if the region increased its renewable power goals to 20 percent of electricity generated. They found that 15,000 miles of new extra-high-voltage lines costing $80 billion would be needed by 2024. Generating 20 percent of the electricity for the eastern power grid from renewable sources would require an additional $1.1 trillion in infrastructure investment.