Solar Panels, for CIVIL discussion

The only thing I know is that when I worked for The Gas Company in the late 70's our City was having a building boom. One new Sub Division decided they wanted no gas line's on the whole place and went 100 % Solar. 5 years later we were asked to put Gas Lines in and help convert the equipment to Nat Gas. About 95% converted to Nat Gas with the rest going all Electric. I'm sure Solar Technology 40 some years later may be better but still question their validity for the above mentioned reasons