Best Solar Companies. California. Next Phase Electric: $4.70 per watt, Your Energy Solutions: $3.87 per watt, Solar Negotiators: $3.65 per watt, Gold Rush Energy Solutions: $3.82 per watt, Sonray: $3.37 per watt, Solectric: $4.07 per watt, Soleeva Energy: $3.77 per watt