They already are trying to stop/slow personal solar. Look up "net metering laws". No conspiracy at all, its in the open. They have no incentive to reduce cost, they have incentive to stay alive.

Couldnt remember the good information I had on the subject at this but a quick google search gave me an article thay covers some of the basics.

http://www.vox.com/2014/9/29/6849723/solar-power-net-meterin...