WHAT A LIE.. Per NRG "All boilers are fueled 100 percent by natural gas"
http://www.nrg.com/business/large-business/distributed-generation/district-heating-cooling/san-francisco/
You may understand that, but the people who vote don’t.
That steam is produced from unicorn farts!
More Jue lies!
Put a sweater on. No boiling of water and burning of fossil fuels. Funny how the most liberal city in California has already found a loophole to deny others and to misuse water and fossil fuels and be arrogant about it.
Just like Hillary taking money from foreign countries and selling off US assets
I love that “the party of science” doesn’t understand where steam comes from.
As a matter of thermal efficiency, you would think the system would be set up as a closed loop but a system that is 80 years old might well be open loop as efficiency wasn’t as important then.
However, normally boiler feed water is run through a deaerator to removed dissolved air (reduces rusting by removing the oxygen) and treated to reduce scale buildup. At least, this is true for steam boilers; not certain if that is the case for district hot water plants, although one would think it would be helpful to keep the pipes clean.