It's changing, but pretty much yes.

There is no reason everyone can't have free energy through steam, from cars to heating your homes. FREE ENERGY FOR ALL!

In 2012, Rice University scientists added metal and carbon nanoparticles to water, creating steam from nearly frozen water without it having to boil first.

The nanoparticles have an efficiency of 82%, with less than 20% of the energy contributing to heating the liquid volume, using tiny solar panels of only a few square centimeters. The best solar panels, in contrast, only have a 15% efficiency.

One model is a closed loop system where water in the steam is recaptured and returned to the boiler after it cools.
Another other model heats waste water, turning it to steam to create distilled drinking water.

Link: Rice University researchers unveil solar-energy technology using nanoparticles to heat water without boiling it, using tiny solar panels only a few square centimeters [news.rice.edu]

It is the biggest generator of electricity, but less than 1/2 of the total, there is nuclear, renewables, hydro etc.
Steam is about 40% I think.