[Porsche-O-Phile]

Nope, flate rate per kWh. One price for the first few hundred kWh in a given month (forget the exact # offhand, I'd have to dig up my spreadsheet that I use to track all this stuff) and another rate once you exceed that. It averages out to about $0.14 for my use IIRC. FWIW it's off the local nuclear power plant a few miles away, so rates are pretty low.

We're ripping out large hot/chilled water storage tanks on one project I'm working on (large commercial high-rise) where they were used as part of a HW/CW plant to enable the chillers to run off-hours back in the 1980s when there were large enough price differentials between day & night to make it worthwhile, then they'd heat/cool the building off what was in the tanks so they could shut the chillers down. Now it's all peak demand pricing, so it doesn't matter - easier/better/simpler to just run new efficiency chillers whenever needed and stick in VFDs all over the place so you don't "spike" the demand and pay for it on motor starts and similar events.

Seems most places are going this way also. The system we're modifying/removing was pretty interesting and innovative, but doesn't really serve a purpose now because of changes to the pricing structure.