TARIFF
Jun 24, 2015
TARIFF
TOPIC 2 - TARIFF
DEFINITION
Payment scale imposed by supplier towards the
consumers.
Supplier Peninsular Malaysia – TNBSarawak – SESCOSabah - SESB
TYPES OF COSTS Suppliers had to cover two types of costs to
produce electricity
Variable Costs Fuel Cost, Generation Plants equipment
spare parts etc
Fixed CostsGeneration Plant Construction, distribution
and transmission, emolument, insurance etc
TARIFF CLASSIFICATION
Three main classification1.Equal Rate Tariff
2. Two Part Tariff
3. Block Tariff
EQUAL RATE TARIFF
This tariff is divided into two type of payment. 1. Payment for lighting and fans. 2.Payment for power from socket outlet.
Is using two split meters. It is rarely use nowadays.
EQUAL RATE TARIFF DIAGRAM
Meter kwh
lamp
powersu
pply
switch
EXAMPLE EQUAL RATE TARIFFA user use 100 units to light the lamps and 200 units of electricity from the socket outlet. This is equal rate tariff, so 20cents for each units of energy used in lighting and 25cents for each units of electric power from the socket outlet. Calculate the total energy used for the house in that month.
For lighting: 100 units x 20cents = RM20.00 For Power: 200 units x 25cents = RM50.00 Total payment = RM70.00
TWO PARTS TARIFF
This tariff is divided into two type of payment. 1.Payment for Maximum Demand. Permanent
usage of energy for each month is called Maximum Demand. Its measured by kW.
2.Payment for the rest usage of energy.
TWO PARTS TARIFF DIAGRAM
POWER & LAMP
METER KWH
MAXIMUM DEMAND
SUPPLY
SWITCH
EXAMPLE TWO PART TARIFF A factory used 200 additional units and the maximum
demand for the month is 4kW. How much will be paid by the consumer if RM12.00 for each kW maximum demand and 7cents for additional units used for that month?
For Maximum demand: 4kW x RM12.00 = RM48.00
For Additional Units: 200 units x 7cents = RM14.00 Total payment = RM62.00
BLOCK TARIFF
This tariff is divided into three scales. Only one power meter is used. First scale for any usage of power under
certain units. Second scale for any usage above first
units. Third scale for any usage above second
units.
BLOCK TARIFF DIAGRAM
POWER & LAMP
METER KWH
SUPPLY
SWITCH
EXAMPLE BLOCK TARIFF A house used 300 units of electricity in that month. Block tariff
is used where first 100 units is charged 25cents a unit, 50 secondary units is charged 20 cents a unit and the rest units is charged 23cents a unit. How much is needed to pay the bill?
1st 100 units = 100 x 25 cents = RM25.002nd 50 units = 50 x 20cents = RM10.003rd 150 units = 150 x 23cents = RM34.50
Total payment = RM69.50
TARIFF RATES Tariff RatesPrint this page “Domestic Consumer” means a consumer occupying a private dwelling, which is
not used as a hotel, boarding house or used for the purpose of carrying out any form of business, trade, professional activities or services.
TARIFF CATEGORY UNITTariff A –
Domestic Tariff For Monthly Consumption Between 0-400 kWh/month For the first 200 kWh (1 - 200 kWh) per month sen/kWh 21.8 For the next 200 kWh (201 -400 kWh) per month sen/kWh 33.4 The minimum monthly charge is RM3.00 For Monthly Consumption More Than 400 kWh/month For the first 500kWh (1-500kWh) per month sen/kWh 28.6 For the next 100 kWh (501-600kWh) per month sen/kWh 37.8 For the next 100 kWh (601-700kWh) per month sen/kWh 38.7 For the next 100 kWh (701-800kWh) per month sen/kWh 39.7 For the next 100 kWh (801-900kWh) per month sen/kWh 41.7 For the next kWh (901 kWh onwards) per month sen/kWh 44.6 The minimum monthly charge is RM3.00
Tariff B - Low Voltage Commercial Tariff For Overall Monthly Consumption Between 0-200 kWh/month For all kWh sen/kWh 37.0
The minimum monthly charge is RM7.20 For Overall Monthly Consumption More Than 200 kWh/month For all kWh (From 1kWh onwards) sen/kWh 39.7 The minimum monthly charge is RM7.20 Tariff C1 - Medium Voltage General Commercial Tariff
For each kilowatt of maximum demand per month RM/kW23.93 For all kWh sen/kWh 28.8 The minimum monthly charge is RM600.00 Tariff C2 - Medium Voltage Peak/Off-Peak Commercial Tariff
For each kilowatt of maximum demand per month during the peak period RM/Kw 35.60 For all kWh during the peak period sen/kWh 28.8 For all kWh during the off-peak period sen/kWh 17.7 The minimum monthly charge is RM600.00
EXERCISE
How much will be paid by Pn Arduniwati
TARIFF SYSTEM FEATURESObtain a reasonable return to the supplierAppropriate and acceptable to the various
types of users.Easily understood by all levels of usersSuppliers will have little benefit with
affordable rates paid by consumers
Factors that influence the cost of raising
i. Diversity factor = the max. number of user request / max. load at station
ii. Load factor = average demand/max demand
= energy produced in one period/
max. demand x at the same time period
iii. Plant capacity factor = average demand / installed capacity
LOAD CURVEGraphic records to show the demand for
power at all times in a period of time. Its shows the view provided an overview of
the load time at that time
The information can be obtained from the load curveArea under the curve gives the total energy
produced in that period.The ratio of area under the curve and the total
are of the square containing the curve ( refer to the max. load), giving a load factor for the period.
Curve gives the max. peak demand at the station at the same period.
Area under the curve period of time in hours = average demand during that period.
* Max request- the max load imposed on a power station in one period ( day, week, month or year
EXAMPLEPower station to generate electricity as a request under the load
TIME (H)
0 – 6 6-12 12-16 16-20 20-24
LOAD A(KW)
3500 6000 - 5000 2500
LOAD B (KW)
- 5000 4500 5000 3500
Draw an curve load and find :
i. Station maximum demandii. Total generationiii. Average loadiv. Load factor
Series10
2000
4000
6000
8000
10000
12000
LOAD CURVE
TIME
LO
AD
(K
W)
RESULTMaximum demand = 11000 kwTotal generation = area under the graph
(3500 x 6) + ( 11000x6) + (4500x4) + (10000x4) + (6000x4) = 21000 + 66000 + 18000 +40000 + 24000= 169000kwh
Average load = total gen. / period = 169000 / 24 = 7041.7 kw
Load factor = average load/max demand= 7041.7 / 11000 = 0.64 @ 64%