Energy Management Manual for Arena and Rink Operators
Section 1 Electrical and Natural Gas Rates
Calculating your electricity bill
All examples in the manual are based on the Standard General Service rate - E05. While this rate applies to most arenas and curling rinks, those facilities where the electrical service demand does not exceed 75 kVA will be invoiced on the Small General Service rate.
Example 1.0 - Calculating your total electricity bill
Assumptions:
- Consume 25,000 kWh in any given billing period (about 30 days)
- Draw 80 kVA of electrical demand
- Run a facility that falls in the Standard General Service (E05) rate
Your monthly cost for electricity would be:
| Basic monthly charge | $ 33.92 | |
| First - 16,750 x $0.0831 | $ 1,391.92 | |
| Balance - 8,250 kWh x $0.05139 | $ 423.97 | |
| $ 1,1815.89 | ||
| Total energy charge | $ 1,849.81 | |
| Total demand charge: | ||
| 80kVA - 50kVA = 30kVA x $10.71 | $ 321.30 | |
| Total energy plus demand change | $ 2,171.11 | |
| (plus taxes and municipal surcharge where applicable) | ||
| Please note: Your minimum monthly bill is the Basic Charge plus $3.00/kVA of the maximum recorded demand over 50 kVA, registered during the past 11 months. | ||
Check saskpower.com for current electrical rates. If you require further information please call 1-888-SKPOWER (1-888-757-6937).
Example 1.1 - Calculating your total charges for an ice plant
If you need to start an ice plant that requires 100kVA, the demand meter gradually registers that load. In this example the demand meter will reach 50 kVA after 4 1/2 minutes and 99 kVA in 30 minutes. If you run your compressor for only 30 minutes you will be charged almost all (99 per cent) of the full demand charge contributed by the refrigeration system for the billing period. In this case, the compressor demand charge would be:
Compressor demand charge
| 1st 50 kVA | 50 kVA @ $0.00/kVA | $ 0.00 |
| Balance: | 49 kVA @ $9.66/kVA | $ 473.34 |
| Total demand charge | 99 kVA | $ 473.34 |
Energy charge
Assume we base the charge on the Standard General Service rate with an estimated power factor of 0.90 (100 kVA x 0.90 = 90 kW). The kWh consumption charge for running the ice plant for half an hour would be as follows:
| 90 kW for 0.5 hours = 45 kWh | |
| The kWh consumption charge is: | 45 kWh x $0.0514/kWh = $2.31 |
Please note: The consumption charge is based on the balance (or runoff) rate and assumes that enough other equipment was operating in the building to use the first 16,750 kWh of energy during this billing period and at this time only the ice plant is operating.
Example 1.2 - Calculating your total charges
In Example 1.0, when you consumed 25,000 kWh of energy, the kWh consumption charge was $1,769.07. If your maximum demand for that billing period increased to 125 kVA, then the demand charges would be calculated as follows:
Demand and consumption charges
| 1st 50 kVA | 50 kVA @ $0.00/kVA | $ 0.00 |
| Balance: | 75 kVA @ $9.66/kVA | $ 724.50 |
| Total demand charge | 125 kVA | $ 724.50 |
An increase in demand would also result in an increase in consumption for the same operating time, however, for display purposes the values in Example 1.0 are used.
Total charges before taxes
| Basis monthly charge: | $ 30.00 | |
| Consumption charges: | $ 1,769.07 | |
| Demand charge | $ 724.50 | |
| Total charges: | $ 2,523.57 | |
| (plus taxes and municipal surcharge where applicable) |
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