In terms of this technology transformation, we're about where PCs and the Internet were at time time in 1970. Back then, you'll remember, Intel was just starting work on what would become the 4004 chip and a researcher had just sent-and-received the first online message.
Skepticism abounded. Computers were seen as giant machines useful only in accounting and scientific applications. New "minicomputers" from companies like Digital Equipment Corp. were starting to drive prices down. But the main interfaces remained the punch card and the print out.
We're at the same stage today with energy technology. Skeptics abound. Working, cost-effective systems seem thin on the ground.
Windmills work, the technology is stable, but they cost big money to erect, they do require maintenance, and each new windmill increases our supply of wind energy by one unit. Geothermal units work best where a source of Earth heat is relatively too close to the surface (to minimize drilling and energy loss from lifting the hot water) but the underlying rock structure is stable. We have not yet learned how to tap volcanoes.