Can EnergyPlus report the time of utility tariff peak demand?

asked 2020-08-08 15:26:32 -0500

updated 2020-08-08 15:28:02 -0500

It's often the case when using tariffs with time of use demand charges that the building's peak demand profile is different than the utility's peak demand profile because the building's peak occurs outside of the utility's peak demand window (see chart below).

The building's absolute peak demand time can be reported from the Electricity:Facility Meter, but can the utility tariff's be reported by EnergyPlus? Context is determining peak shifting for grid-interactive efficient buildings (GEB).

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I haven’t thought about exactly what this would look like, but I would think there is some time series output(s) that could be post processed by reporting measure to gather this, although I recall that time series outputs related to economics are limited.

David Goldwasser gravatar image David Goldwasser  ( 2020-08-12 00:37:07 -0500 )edit

Thanks David. Any thoughts @JasonGlazer?

MatthewSteen gravatar image MatthewSteen  ( 2020-09-03 16:21:44 -0500 )edit

There may be two things going on, one is the hours that are "peak" and the other is the demand window. The hours that are peak can be post processed relatively easy if you also report the schedule that corresponds to the hours that are peak. I don't have a script to do that but I can't imagine it would be too difficult. The demand window issue is more tricky. If the number of timesteps and demand window size are different, then some averaging is going on that would need to be considered. Again a script might work. The bigger question, why not just use what is reported with the tariff?

JasonGlazer gravatar image JasonGlazer  ( 2020-09-14 10:36:07 -0500 )edit

@JasonGlazer thanks. I'm trying to avoid post-processing. It doesn't appear that the Tariff Report reports the time of peak (just peak demand) like can be done for meters. This will be important for determining load shifting for DOE's GEB initiative.

MatthewSteen gravatar image MatthewSteen  ( 2020-09-15 11:43:20 -0500 )edit

@MatthewSteen if you need the time of peak, I can't think of anything but some post processing. You might want to post an EnergyPlus new feature request issue to add the time to the Tariff tabular report

JasonGlazer gravatar image JasonGlazer  ( 2020-09-15 13:23:02 -0500 )edit