Calculation Electric Demand

[galer]

Our planning & zoning staff person sent me message that a new manufacturer is considering moving into our City and they are asking for estimates for the utilities we provide in the following "annual usage scenario".

For electric they said annual usage is 2,800,000 kWh @ .7 MW peak demand. I guess I don't understand how to calculate a monthly peak demand based on that information. Do you?

 

[retirede]

When I used to be involved in stuff like this, the utility would simply provide their tariff / rate schedules. They never calculated a proforma bill.

I guess you could assume they hit the peak of 0.7 MW every month? It depends on how you calculate demand charges. It used to be here that the daytime peak demand incurred between June 1 and Aug 31 set your demand charge for the next 12 months!

 

[electrofelon]

Our planning & zoning staff person sent me message that a new manufacturer is considering moving into our City and they are asking for estimates for the utilities we provide in the following "annual usage scenario".

For electric they said annual usage is 2,800,000 kWh @ .7 MW peak demand. I guess I don't understand how to calculate a monthly peak demand based on that information. Do you?

Well you could just calculate energy cost based on the kilowatt hour figure given and then apply whatever your demand rate is on the 0.7 megawatt each month. That will probably be on the high side so only other thing you could do is get more information from them on how much the demand varies per month. Their existing power company should have that information no problem

 

[steve66]

Isn't peak demand given? .7 MW? What do you have to calculate?

 

[topgone]

Isn't peak demand given? .7 MW? What do you have to calculate?

700 kW is probably the average 15-minute peak demand of the month. Playing with his numbers, we could see that the average load is around 320 kW. That is on the low side of the demand factor range (45%)