Cost Assessment
By. Dr. Youcef Berrouche
Counters type
Electromechanical
Digital
The bill
Prices
Fixed price
Current price
Investment cost : breakers
transformers, cables ....
Operating cost, maintenance,
fuel prices .....
The bill
Calculation of the bill is based on:
1. Energy in kWh
2. Active power kW
3. Apparent power in kVAR
The bill
1. Calculation of the bill is based on the Energy
Customer 1
Customer 2
Power =10W
Power =10W
Time :2H
Time : 5H
Energy :20WH
Energy 50WH
$
$$$
The bill
1. Calculation of the bill is based on the Energy
Example
Home appliance
Power
Hours /day
Energy wh
TV 1
60W
10
600
TV 2
120W
2
240
Refrigerator
50W
24
1200
Air conditioner 1
1995
24
47880
Air conditioner 2
1995
12
23940
Air conditioner 3
2500
6
15000
Lampe 1
30
15
450
Lampe 2
30
15
450
Lampe 3
10
15
450
Washing machine
200
1
200
Dryer
3500
1
3500
Total =93910w/day=225kw /month
The bill
1. Calculation of the bill is based on the Energy
Consumption kwh
1-1000
2000-1001
3000-2001
4000-3001
5000-4001
6000-5001
7000-6001
8000-7001
9000-8001
10000​-9001
More than 10000
Price (Halalah /kWH)
5
5
10
10
12
12
15
20
22
24
26
The bill
1. Calculation of the bill is based on the Energy
Example : A big house is consuming 6500kWH for the month
of June. Calculate the price of this current energy .
The bill
2. Calculation of the bill is based on the active power pick
The bill
2. Measuring of the active power pick
measures the active power
pick and the energy
The bill
2. The solution for the factories
Power controller disconnects the no used loads
during the pick
The bill
3. Calculation of the bill is based on the apparent power
Factory X: PF=100%
Factory Y : PF=50%
The bill
3. Calculation of the bill is based on the apparent power
Line current is proportional to S. So the conductor section is bigger
for the small PF
Saudi electricity company
Any consumer of electricity classified within the industrial, governmental consumption or
commercial consumption, and whose contractual load is over one mega volt ampere (1
MVA), should adhere to the minimum electrical power factor of (0.85)
The bill
3. Calculation of the bill is based on the apparent power
Factory Solution
The bill
3. Calculation of the bill is based on the apparent power
Factory Solutions: example
A factory absorbs apparent power of 300kVA with PF of 65%.
Calculate the capacitor with kVAR that should be installed to
increase the PF to
a) 100%
b) 90%
The bill
4. Calculation of the bill is based on the customer category
Defined by Saudi Electricity Company
•
For all the categories Monthly fee of Meters:
•
Class 1: Residential, Commercial, Governmental, Charities
and Agricultural
•
•
Class 2: Industrial, Private Educational Facilities, Private
Medical Facilities
Cass 3 Time Of Use (TOU) Tariff for Commercial :
•
Cass 4: Electricity Tariff for the Temporary Meters :
The bill
For all the categories Monthly fee of Meters:
Saudi Electricity Company charges a constant monthly amount based on the capacity of
breakers. Each month, the company charges this amount due to meter reading, meter
maintenance and bill preparation. As the following table:
The bill
•
Class 1: Residential, Commercial, Governmental, Charities
and Agricultural
The bill
The bill
Example 1 : a city mosque on the prince Naif ben
abdulaziz road has consumed 8020 kwh for the
month of January. Calculate the price of the
current energy
Example 2: Almajmaah university : has consumed
8000 kwh for the month of march. Calculate the
price of the current energy
The bill
•
Class 2: Industrial,Private Educational Facilities, Private
Medical Facilities
The bill
The bill
Inefficient Energy Consumption Tariff :
1. Any consumer of electricity classified within the industrial, governmental consumption or
commercial consumption, and whose contractual load is over one mega volt ampere (1 MVA),
should adhere to the minimum electrical power factor of (0.85).
2. Inefficient Energy Consumption tariff applied at (5) Halalas per every additional (K.Var.H.),
when the monthly consumption of the ineffective power exceeds (62%) of the effective power
consumption (power factor coefficient is less than 0.85).
The bill
Example 1 ;
In the month of June, the Indian school of Al Majmaah has
consumed 7000kwh. The school still using a n electromechanical
counter. Calculate the current bill
Example 2 ;
In the month of November , the Sedir clinic of Al Majmaah has
consumed 5000kwh. The clinic is using an digital counter.
Calculate the current bill
The bill
Case 3: Time Of Use (TOU) Tariff for Commercial :
Time Of Use (TOU) tariff for commercial is optionally applied
to the commercial customers as follows :
1. (17 Halalas) off-peak times, and (65 Halalas) within peak
times. Peak time is defined (from 12:00 noon until 5:00
afternoon), Saturday through Thursday, and will be applied
as of May until September (i.e. five months a year).
2. This tariff is subject to an annual reevaluation process.
The bill
Example :
Panda of Almajmmah has decided to choose the case 3 for
the bill. Its daily power consummation ( Saturday –Friday) is
given in the table bellow. Calculate the bill for the month of
June.
HourThe bill
Hour am Power pm
Power
1
100
1
300
2
100
2
300
3
100
3
300
4
100
4
300
5
100
5
300
6
100
6
300
7
100
7
300
8
100
8
200
9
200
9
200
10
200
10
100
11
300
11
100
12
300
12
100
The bill
•
Cass 4: Electricity Tariff for the Temporary Meters :
The bill
Example
A temporary work is installed for the month of April.
It has consumed 7200kWh. Calculate the current bill
The bill