Understanding Demand Charges in Condominium Buildings

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Discussion Overview

The discussion revolves around the significant increase in demand charges for electricity in a condominium building, specifically from a base of 40 to 115. Participants explore potential reasons for this change, including utility practices and building usage patterns, while seeking clarification on the underlying mechanisms of demand charges.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes the sudden increase in demand charges and questions whether it could be due to changes made by the power utility, such as adjustments to power lines or load management.
  • Another participant suggests that demand charges are based on the highest usage over a short period, indicating that simultaneous high usage by residents (e.g., turning on air conditioning at the same time) could lead to increased charges.
  • A participant reiterates the idea that the utility does not increase customer demand requirements but must ensure that the entire system can handle peak demands, implying that infrastructure must be adequate to supply power effectively.
  • There is a question about what actions a utility company might take to adjust demand requirements, such as upgrading power lines or replacing meters.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the causes of increased demand charges, with no consensus reached on the specific reasons behind the changes. Some focus on user behavior while others consider utility practices.

Contextual Notes

Participants have not fully explored the technical details of how demand charges are calculated or the specific operational changes made by the utility, leaving some assumptions and definitions unaddressed.

waterfall
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My sister has a condo unit whose building used to have Demand Charge of only 40 Base in 2010. Then suddently the Base became 115 in 2011 up to now. Does anyone have an idea why? The building admin didn't understand why because they are not technical people. Did the power utility increase the power lines levels outside or did they adjust the load or something. What could they have possibly done to make such big Demand Changes? There is no additional load in the building. No one has a clue. Electricity has jump to twice. Why did Demand Charge jumped from 40 to 115 all of a sudden? Thanks.
 
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IN short - demand charge are what the utility bills you to be able to have the capacity to meet your highest demand. I believe many systems will monitor for the highest usage over a 15 minute period for the whole month. In a condo - if everyone turns their AC on at 5:00PM - I'll bet that is the peak they are seeing.
For example - if you added setback thermostats to all of the condo units - and programmed them the same way (5:00PM )- you will get hammered for a demand charge.
 
Windadct said:
IN short - demand charge are what the utility bills you to be able to have the capacity to meet your highest demand. I believe many systems will monitor for the highest usage over a 15 minute period for the whole month. In a condo - if everyone turns their AC on at 5:00PM - I'll bet that is the peak they are seeing.
For example - if you added setback thermostats to all of the condo units - and programmed them the same way (5:00PM )- you will get hammered for a demand charge.

What does the utility company usually do to increase one's demand requirement.. do they put higher power lines to the building or do they just replace the meter?
 
Hello Waterfall - Like I said, the 5:00PM surge is tough, so the whole system has to be sized to meet the peak demand. The way you phrase your question - I am not sure what you mean. The Utility does not increase the customer demand requirement, but the utility has to be able to effectively supply power for everyone - so they have to have supply ( generation) on line AND the whole system has to be able to deliver the power.
 

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