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EnergyPlus™ is a whole building energy simulation program that engineers, architects, and researchers use to model both energy consumption and water use in buildings.
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Add capacity tag to UtilityCost:Tariff #5077

Open JasonGlazer opened 9 years ago

JasonGlazer commented 9 years ago

Some utilities charge the customer for their demand during the highest 4 or 5 coincident peak demands that that the utility sees (not the individual building) for the past year. This cannot be easily computed using the existing UtilityCost:Tariff structure and a new field for a schedule of when these coincident peaks occur should be added to one of the UtilityCost objects.

See the article "The Hidden Daytime Price of Electricity" by Evan Berger in April 2015 ASHRAE Journal for more details.

This is also known as peak load contribution, customers ICAP, capacity tag, or captag.

MatthewSteen commented 9 years ago

+1. For an example, look at Fort Collins' coincident peak...

http://www.fcgov.com/utilities/business/rates/electric/coincident-peak

mjwitte commented 9 years ago

And here's one that requires two schedules and multiple points. ComEd (Chicagoland) residential real time pricing capacity charge is based on an average of the demand coincident with the five highest PJM System peaks and the five highest ComEd System peaks. (Nearly impossible as a customer to know when these will happen and adjust.)

From https://rrtp.comed.com/faqs/ "How is the Capacity Charge calculated?"

If you were enrolled in the RRTP program or had a smart meter during the previous summer, your Capacity Obligation is based on your individual electricity usage data from that summer. In this case, ComEd calculates your highest electricity demand (adjusted for Transmission and Distribution losses) coincident with the five hours of the summer when the overall PJM System demand was highest (PJM Coincident Demand) (this has historically occurred between 1 p.m. and 5 p.m. on weekdays), and the five hours of the summer when ComEd’s System demand was highest (ComEd Coincident Demand) (these sets of hours may or may not overlap). These two sets of five coincident demands are averaged and adjusted to determine your contribution to the system load, creating your Capacity Obligation.