There is a mental block around "efficiency". Because what most people have in mind is some sort of technical performance efficiency of the solar + battery syste

There is a mental block around "efficiency". Because what most people have in mind is some sort of technical performance efficiency of the solar + battery system. And if it's not higher than some number - then it's unworkable in region X. Technical performance is an input in the efficiency that actually matters, but definitely not the sole determinant. Ultimately the cost efficiency that delivers the needed power at the some time. If you can capitalize more panels at the right cost, it overcomes an "uunworkable" technical performance efficiency. Five years ago, solar + batts were getting dismissed as being able to offset natural gas. Now its offseting that tradoff in new energy builds for California. What we're seeing is renewables advancing on multiple efficiency fronts - both technical performance efficiencies, and subsystem costs, to deliver more competitive system cost efficiency. More and more traditional energy and more regions will be displaced because these technologies are still in the rapid cost drop phase of their manufacturing S curves. It's really a matter of who has the focus and financial strength to continue to invest in the manufacturing and tech to keep up the improvements - a lot like the solar+batt version of Moores law in chips and the race surrounding it.