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The following is an electric rate tariff for larger industrialcustomers Meter Charge: $680/billing period Energy Charge $0.05 for the first 100,000 kwh $0.06 for the

The following is an electric rate tariff for larger industrialcustomers

Meter Charge: $680/billing period

Energy Charge

$0.05 for the first 100,000 kwh

$0.06 for the next 400,000 kWh

$0.075 for all remaining kwh

$5.45 per kw demand charge per billing period

A 20% energy charge fee is added to the total energy charges if thepower factor of the

plant is below 0.85

The customer?s electric usage data is

ELECTRICAL ENERGYCONSUMPTIONPEAK DEMAND

Jan275,0001,091

Feb425,3871,643

March 642,7842,590

April535,9082,200

May688,4142,671

June783,9823,682

July821,4193,764

August742,1493,791

Sept893,6343,770

Oct698,5762,258

Nov689,7192,315

Dec591,3122,401

It is suggested that you use a spreadsheet to simplify thefollowing problems. Using the

utility rate schedule described above:

1. What are the customer?s bill for the year if the power factorover the year is 90%

2. Compare that result to the customers bills if the power factorfor all months of

the year is 80%

3. Find the customers load factor for each month

4. What is the customers average cost of electricity (PF=0.8) in$/kW hours

5. If the customer reduces power use by 1kWh in July but does notreduce demand,

how much is saved. (PF=0.8)

This customer now performs an energy audit and finds the savings inusage from a number

of projects. Find the customer?s savings in dollar per year for thefollowing projects.

Assume the customer has a PF=0.8 in all cases

6. This customer reduces power use by 10 kW by installing moreefficient exit signs.

7. The customer shuts down 50% of their parking lot lights frommidnight to 6 AM,

reducing power usage during that period by 100 kW.

8. The customer?s business requires the operation of a 250 kW heattreatment oven

for 3 hours each weekday, and will be moving this operation fromthe first shift,

during the day, to the third shift from 11PM to 7AM

For many customers, an added element is added to the bill, and thatis a lower cost for

power purchased at night. Here in Northern Illinois, largecustomers were, for decades

on a rate of $0.022/kWh for all power used at night. Adding this tothe customer rates

used above,

9. Now how much will the customer save by moving the operation ofthe 250 kW

moving to the third shift

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