Annex I - Current tariffs
Introduction
1
In this annex, we set out the current:
(a)
base retail tariffs (we use MEA’s schedule which differs slightly from
PEA’s schedule, in particular it contains power factor charges); and
(b)
base bulk supply tariff (BST).
2
The Automatic Adjustment Mechanism (Ft), which is added to the base tariffs
to form the tariffs actually charged to customers, is set out in Annex O.
Base retail tariffs
3
Base retail tariffs vary by consumer category, and are summarised below for
each category. The categories and nominal average level of base tariffs in each
consumer category have remained largely constant since 1991, although there have
been changes in the structure of tariffs within a consumer category. The structure of
tariffs has remained unchanged since January 1997.
4
For Residential consumers, there is a progressive block structure with a
minimum charge. The progressive block structure comprises a fixed amount for the
first consumption block and then multiple consumption blocks with increasing
Baht/kWh charges. The rates are given in Table I1.
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Table I1: Base retail tariffs for Residential consumers
Consumption not exceeding 150 kWh per month
Energy Charge:
First 5 kWh (1st - 5th )
Next 10 kWh (6th - 15th)
Next 10 kWh (16th – 25th)
Next 10 kWh (26th – 35th)
Next 65 kWh (36th –100th)
Next 50 kWh (101st –150th)
Next 250 kWh (151st – 400th)
Over 400 kWh (401st and above)
Minimum Charge:
Baht 4.9600
Baht 0.7124/kWh
Baht 0.8993/kWh
Baht 1.1516/kWh
Baht 1.5348/kWh
Baht 1.6282/Wh
Baht 2.1329/kWh
Baht 2.4226/kWh
Baht 4.67/month
Consumption exceeding 150 kWh per month
Energy Charge:
First 35 kWh (1st-35th)
Next 115 kWh (36th – 150th)
Next 250 kWh (151st – 400th)
Over 400 kWh (401st and above)
Minimum Charge:
Baht 85.2100
Baht 1.1236/Wh
Baht 2.1329/kWh
Baht 2.4226/kWh
Baht 83.18/month
5
The tariff for Small General Services (defined as having a 15 minute
maximum integrated demand of less than 30kW) is the same as for Residential
customers with consumption above 150kWh/month in Table I1, except that:
(a)
the first 35 kWh are charged at Baht 89.8900 (instead of 85.2100); and
(b)
the minimum charge is Baht 87.85 (instead of 83.18).
6
Medium General Services are defined as having a 15 minute maximum
integrated demand of between 30 and 1,999 kW, and average energy consumption of
less than 355,000 kWh. The same tariff also applies to government institutions with
average energy consumption of 250,000 - 355,000 kWh. The normal tariff for this
category is given in Table I2. It comprises a demand charge and energy charge which
vary by voltage level.
Table I2: Normal base tariffs for Medium General Services
Voltage level
69 kV and Over
12-24 kV
Below 12 kV
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Demand Charge
(Baht/kW)
175.70
196.26
221.50
Energy Charge
(Baht/kWh)
1.0208
1.0582
1.0862
7
Customers in this category with energy consumption greater than 250,000
kWh can elect to use the Time of Use (TOU) tariff in Table I3.
Table I3: TOU tariffs for Medium General Services
Voltage
Demand
Energy Charge (Baht/kWh)
Charge
(Baht/kW)
1*
1*
2*
3*
115 kV and Other
102.80
1.5349
0.6671
0.6062
69kV
158.88
1.6292
0.6769
0.6153
12-24 kV
200.93
1.7736
0.6861
0.6236
Below 12 kV
214.95
1.8891
0.7283
0.6616
1* Monday – Saturday 09.00 AM – 10.00 PM (On Peak)
2* Monday – Saturday 10.00 PM – 09.00 AM (Off Peak)
3* Sunday
00.00 AM – 12.00 PM (Off Peak)
8
Service
Charge
(Baht/Month)
400.00
400.00
850.00
850.00
In addition:
(a)
there is a minimum charge, which is 70% of the maximum billing
demand charge of the preceding 12 months; and
(b)
if the customer’s 15 minute kVar demand exceeds 63% of its 15
minute kW demand, there is a power factor charge of Baht 14.02 for
each excess kVAr.
9
Specific Business Services are defined as hotels or other lodging
accommodation having a 15 minute maximum integrated demand of 30 kW or over.
The tariff structure for these customers is the same as for Medium General Services.
The only difference is that the normal tariff demand charge is higher, namely 220.56,
256.07 and 276.64 Baht/kW for 69kV and over, 12-24 kV and below 12 kV
respectively.
10
Large General Services are defined as having a 15 minute maximum
integrated demand of 2,000 kW or more, or average energy consumption of more than
355,000 kWh. The same tariff also applies to government institutions with average
energy consumption of over 355,000 kWh. These customers may choose between the
TOU tariff in Table GI3 above, or the Time of Day (TOD) tariff in Table I4, except
that customers classified as Large General Services since October 1997 must take the
TOU tariff.
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Table I4: TOD tariffs for Large General Services
Voltage
Demand Charge (Baht/kW)
Energy Charge
(Baht/kWh)
1*
2*
3*
69 kV and Other
224.30
29.91
0
1.0208
12-24 kV
285.05
58.88
0
1.0582
Below 12 kV
332.71
68.22
0
1.0862
1* Every day 06.30 PM – 09.30 PM (On Peak)
2* Every day 08.00 AM – 06.30 PM (Partial Peak ) (Only the amount of maximum
demand that is out of On Peak period will be charged at this tariff)
3* Every day 09.30 PM – 08.00 AM (Off Peak) (No demand charge)
11
There is also a minimum charge and power factor charge which are defined in
the same way as for Medium General Services.
12
The Government and non-profit organisations category includes
government institutions with average energy consumption not exceeding 250,000
kWh, and non-profit organisations. For this category there is an energy charge and a
minimum charge (which vary by voltage level), although there appears to be an
inconsistency between the two charges. The details are given in Table I5.
Table I5: Tariffs for Government and non-profit organisations
69 kV and Over
Energy Charge:
First 10,000 kWh (1st – 10,000th)
Over 10,000 kWh (10,001st and above)
Baht 14,413.31
Baht 1.4413/kWh
12-24 kV
Energy Charge:
First
300 kWh
(1st –300th)
st
Over 300 kWh (301 and above)
Baht
480.06
Baht 1.6002/kWh
Below 12 kV
Energy Charge:
First 10 kWh (1st – 10th)
Over 10 kWh (11th and above)
Baht 18.06
Baht 1.8058/kWh
Minimum Charge:
69 kV and over
12-24 kV
Below 12 kV
Baht 13,831.78/month
Baht 462.62/month
Baht 17.48/month
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13
For Pumping for Agricultural Purposes, there is an energy charge, which
does not vary by voltage level, and a minimum charge, as shown in Table I6.
Table I6: Tariffs for Pumping for Agricultural Purposes
Energy Charge:
First 100 kWh (1st – 100th)
Over 100 kWh (101st and above)
Baht 115.16
Baht 1.1516/kWh
Minimum Charge:
Baht 109.35/month
14
There is also a Stand-by tariff for customers who own their own generating
equipment, but who require power in the event of breakdown or maintenance. Such
customers have to sign a stand-by power purchase agreement with the relevant
distribution utility, which, inter alia, specifies the level of demand. Their annual load
factor must also be less than 15%. The charges are as follows:
15
(a)
a lower demand charge than in the normal tariff (see below); and
(b)
the same energy charge as in the normal tariff.
The demand charge is:
(a)
15% of the normal tariff for cogeneration plants under the SPP
regulations, and 30% of the normal tariff for other customers, as long
as demand does not exceed the level stipulated in the stand-by power
purchase agreement; and
(b)
double the normal tariff if demand does exceed the level stipulated in
the stand-by power purchase agreement.
16
Finally there is an Interruptible tariff for customers with demand of at least
5,000 kW with an interruptible load of at least 1,000 kW. Such customers have to
sign an interruptible tariff power purchase agreement. There are three options as
follows:
17
(a)
Option 1: interruptions do not exceed 3 hours per time, twice daily, 10
times monthly, 40 times yearly;
(b)
Option 2: interruptions do not exceed 3 hours per time, once daily, 10
times monthly, 20 times yearly; and
(c)
Option 3: interruptions do not exceed 6 hours per time, once daily, 10
times monthly, 20 times yearly.
The tariff for each option is given in Table I7.
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Table I7: Interruptible tariffs
Monthly Tariff: Calculated from the Time of Day Tariff (TOD Tariff).
Option/voltage level
Demand Charge
(Baht/kW)
Option 1 and 3
69 kV and over
69.16
12-24 kV
103.74
Option 2
69kV and over
146.73
12-24 kV
194.39
Demand will be calculated for 08.00 AM – 09.30 PM every day
Energy Charge
(Baht/kWh)
1.0208
1.0582
1.0208
1.0582
Base bulk supply tariff
18
The current base bulk supply tariff (BST) is given in Table I8. It is referred to
by EGAT as the “Wholesale Rate for MEA and PEA”. It has remained unchanged
since July 1997.
Table I8: Wholesale Rate to MEA and PEA
Voltage level
(kV)
230
115
69
33
22
Monday – Saturday
(Baht/kWh)
09.00-22.00 Hr
22.00-09.00 Hr
1.5349
0.6671
1.5697
0.6697
1.6292
0.6769
1.7720
0.6857
1.7751
0.6864
Sunday
(Baht/kWh)
00.00 – 24.00 hr
0.6062
0.6088
0.6153
0.6232
0.6238
19
The Wholesale Rate is an energy charge which varies both by voltage level
and by time of use. The time of use is divided into three periods, but it is clear that
the intention is to define:
(a)
a peak period during which the charge is relatively high; and
(b)
an off-peak period, which is divided into two sub-periods during which
the charges are relatively low (and broadly similar).
20
The charges applicable to MEA and PEA differ from those in Table I8,
because there is a cross-subsidy from MEA to PEA to compensate PEA for
itsrelatively high costs. The surcharge for MEA is 0.2577 Baht/kWh and the discount
for PEA is 0.1205 Baht/kWh.
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