Thanks for your feedback.
yes, they "becoming" more efficient; however, the current technology if installed, will not be efficient. We are still years away from it being able to support an entire grid.
That is, if it can ever do that.
don't get me wrong, I'm not saying don't use it. But people need to be realistic with their expectations. Other sources of power are still needed.
Personally, I'd like to see Cold-Fusion developed. It will be, but we are even further away from that reality.