Well, kind of.
I saw this on the latest episode of Real Time with Bill Maher (which is a really funny and informative show). He laid out this statistic claiming solar panels placed in the Arizona desert (where the sun always shines), would provide enough power for the entire United States.
Okay, yeah, that's true if 100% of the power could be transmitted throughout the United States. Transferring power long distances isn't exactly easy. Some of the power is lost over long distances, especially when we are talking about the entire US!
This on top of the economic barriers. One such barrier is the fact we'd need to build an entire infrastructure to handle it. Lots of cash the government does not have. Secondly, after such a structure is built, tons of jobs would be lost in power plants throughout the US. Thirdly, no one would make money from the actual power generation. The only revenue anyone gets would be from the companies tasked with repairing and maintaining the network itself.
Because everyone has to make money to perpetuate the economy, in addition to the massive technological barriers (which are being worked on), I don't see such a system anytime in the near future, unfortunately.
I still like using water treatment plants, what do you guys think?