At least 36 high-voltage U.S. transmission projects costing $64 billion—which are ready or near ready to be built—would add about 15% of needed higher-voltage capacity and 10,000 miles of new lines over longer distances, to help decarbonize the American power system, says a new analysis.

They would connect about 187 GW of U.S. wind and solar capacity, which would raise those types of generation by 87%, says Grid Strategies, a transmission consultant, in its Sept 13 report.