A renewable power transmission overlay for generating electrical power of regional extent includes three types of generators for generating electrical power from wind, solar radiation and biomass, along with a plurality of region-wide transmission facilities with each region-wide transmission facility having at least one collection facility for collecting electric power from at least one of the generators for generating electrical power. Inter-regional transmission facilities are included which selectively couple the electric power generated by at least two of the types of electrical generators and at least one substation electrical facility is coupled to each of the collection facilities of the region-wide transmission facilities for downloading the electrical power generated to a local electrical transmission grid which, preferably, firms the electric power that is generated, transmitted and downloaded to the local electrical transmission grid.