While the federal government is involved in the siting of natural gas, hydroelectric plants, and certain transmission infrastructure, it has no authority whatsoever over the siting of solar arrays on private land.
Typical cost range for adding or replacing a 2-pole 220 breaker generally falls between $85 and $680, with most residential installations landing around the $125–$250 mark for a standard 20–30A breaker. For higher amperages, AFCI/GFCI protection, or difficult access panels.