Chương VI Thông tư 30/2014/TT-BCT: Tính toán giá điện năng thị trường và thanh toán trong thị trường điện

Chapter VI

CALCULATION OF PRICE OF MARKET POWER AND PAYMENT IN ELECTRICITY MARKET

Section 1: POWER METERING DATA

Article 65. Supply of metering data

1. Before 15:00 pm of day D+1, the power metering data managing Units shall provide the electricity system and market operating Unit and the single wholesaling Units  with the power metering data of each transaction cycle of day D.

2. Before the eighth working day after the end of payment cycle, the power metering data managing Units shall provide the electricity system and market operating Unit with the power metering data in the payment cycle specified in Regulation on power metering in the competitive electricity generation market issued by the Ministry of Industry and Trade.

Article 66. Storage of metering data

The electricity system and market operating Unit shall store the power metering data and relevant dossiers for a period of at least 05 years.

Section 2: CALCULATION OF POWER PRICE OF MARKET POWER

Article 67. Determining the price of market electricity

1. After transaction day D, the electricity system and market operating Unit shall set up the market electricity price calculation schedule for each transaction cycle of day D in the order as follows:

a) Calculating the system load in transaction cycle by converting the metering output to the terminal of generating sets;

b) Setting the market electricity price calculation schedule by the method of unconstrained scheduling in the order as follows:

- Making the fixed arrangement under the base of load chart of electricity system the output actually generated of electricity generating Units indirectly doing transactions of electricity market, imported power, BOT power plants, tested generating sets, power plants in industrial parks selling only part of output into the national electricity system and generating sets separated from electricity market;

- Arranging capacity bands in the scheduling price quotation of the electricity generating Units directly doing transactions.

2. The price of market power is equal to the offered price of the last capacity band scheduled to meet the system load in the market electricity price calculation schedule. In case the offered price of the last capacity band in the price calculation schedule of market power is higher than the market price ceiling, the price of market power is calculated by the market price ceiling.

3. Before 9:00 am of day D+2, the electricity system and market operating Unit shall announce the price of market power of each transaction cycle in day D.

Article 68. Determining the paid capacity

1. The principles to determine the paid capacity for each transaction cycle:

a) The generating sets participating in electricity generation in each cycle in the market are scheduled to receive the price of market capacity for such cycle except the slowly-started generating sets stopped for backup or due to breakdown;

b) The paid capacity of generating set is at least equal to the power output of such generating set at the metering location;

c) Where the total capacity of generating sets with equal offered price, the capacity receiving the price of market capacity at such price band is evenly divided to the generating sets.

2. After transaction day D, the electricity system and market operating Unit shall set the capacity schedule for each transaction cycle of day Article in the order as follows:

a) Calculating the adjusted load in transaction cycle is the system load plus the following components:

- Spinning backup capacity for transaction cycle;

- Frequency modulation capacity for transaction cycle;

- Component of encouraging capacity and capacity of generating sets with increased generation are calculated by 3% of total generated output of electricity generating Units directly doing transaction of electricity market in the transaction cycle.

b) Implementation of capacity scheduling by the method of unconstrained scheduling to meet the adjusted load determined under Point a of this Clause in the order as follows:

- Making the fixed arrangement under the base of load chart of electricity system the output actually generated of electricity generating Units indirectly doing transactions of electricity market, imported power, BOT power plants, tested generating sets, power plants in industrial parks selling only part of output into the national electricity system and generating sets separated from electricity market;

- Making the fixed arrangement under the base of load chart of electricity system the frequency modulation capacity, spinning backup and increasingly generated capacity of generating sets;

- Making arrangement of capacity bands in the scheduling price quotation of electricity generating Units except for slowly-started generating sets which have stopped their operation for backup or stopped due to breakdown.

3. Amount of paid capacity of generating set in transaction cycle is calculated by the amount of capacity of such generating set arranged in the capacity schedule.

4. Before 9:00 am of day D+2, the electricity system and market operating Unit shall announce the amount of paid capacity of each generating set in transaction cycles of day D.

Article 69. Determining the price of market power and paid capacity upon intervention in electricity market

1. In case the market intervention time is less than 24 hours:

a) The electricity system and market operating Unit shall use the valid price quotation to determine the price of market power specified in Article 67 and the paid capacity specified in Article 58 of this Circular;

b) Where the generating set does not have its valid price quotation, the electricity system and market operating Unit shall use the price floor for the hourly contract output and the price ceiling of quotation for the output outside contract for setting the market electricity price calculation schedule and capacity schedule for such transaction cycle.

2. Where the market intervention time is greater or equal to 24 hours, the electricity system and market operating Unit shall not calculate the price of market power and the paid capacity for the period of market intervention.

Section 3: MAKING PAYMENT TO THE ELECTRICITY GENERATING UNITS DIRECTLY DOING TRANSACTION

Article 70. Power output for payment in electricity market

1. The electricity system and market operating Unit shall calculate the components of power output of the power plant in the transaction cycle for payment in electricity market, including:

a) Output of power paid at the offered price for thermal power plants having their offered price higher than the market price ceiling (Qbp);

b) Power output increasingly generated (Qcon);

c) Power output generated for difference compared with the output mobilized by the dispatching order (Qdu);

d) Output of power payment at the price of market power (Qsmp).

2. The power output generated for difference compared with the output mobilized by the dispatching order (Qdu) of the power plant in transaction cycle is determined in the order as follows:

a) Determining the output mobilized by the dispatching order

The output mobilized by the dispatching order is the output at the terminal of generator is calculated based on the dispatching order of mobilized generating set of the electricity system and market operating Unit and based on the capacity by the dispatching order and the speed of load increasing and reduction of the generating set. The output mobilized by the dispatching order is determined by the following formular:

In which:

i: i^th transaction cycle;

J: Number of times of changed dispatching order in transaction cycle i;

: j^th moment in transaction cycle i when the electricity system and market operating Unit has its dispatching order for change of capacity of the generating set (minute);

: Moment when the generating set reaches the capacity level of which the electricity system and market operating Unit issues the dispatching order at the moment (minute);

: Output mobilized by the dispatching order at the terminal of generator determined for transaction cycle i;

: Capacity dispatched by the electricity system and market operating Unit for the generating set at the moment ;

: Capacity the generating set reaches at the moment

The period from the moment of dispatching order capacity  to the moment  when the generating set reaches capacity  is determined as follows:

In which:

a: Speed of load increasing and reduction of the generating set registered in the scheduling price quotation (MW/minute).

The speed of load increasing and reduction of the generating set registered in the scheduling price quotation must be consistent with the speed of load increasing and reduction announced in the electricity sale contract. In case the electricity sale contracts do not have the speed of load increasing and reduction or the speed of load increasing and reduction in the contract has difference compared with reality. The electricity generating Units shall determine such data according to the testing result or aggregation from the operational reality of the generating set and sign the contract annex on such technical features with the single wholesaling Units  as a basis for payment;

b) The electricity system and market operating Unit shall calculate and convert the output mobilized by dispatching order (Qddi j ) to the metering location;

c) Power output generated for difference compared with the output mobilized by the dispatching order is determined by the following formula:

In which:

: Power output generated for difference compared with the output mobilized by the dispatching order converted to the metering location for transaction cycle i;

: Metered power output of the power plant in transaction cycle i (kWh);

: Output mobilized by dispatching order converted to the metering location for transaction cycle i.

d) In case of start or stop of thermoelectric set (not due to breakdown), such output Qdu is equal to 0 (Qdui = 0). If such generating set is technically constrained and affect the generated capacity of other generating sets of the plant, such affected generating sets whose output Qdu shall not be counted (Qdui = 0).

dd) In order to increase the accuracy in determining the component Qdu, the meters at terminal of generating set and the meters installed at the self-used metering location of the generating set (if any) are used with priority to determine the amount of actual generation at the terminal of generating sets for comparison with the compliance with dispatching order as per the management system of dispatching order (DIM);

e) The permissible dispatching power error for generating sets with their installed capacity of less than 100 MW is 5% and 3 % for generating sets with their installed capacity from 100 MW or more but not less than 1.5 MW in any case. In case the output is within the permissible error limit, such output is equal to 0 (= 0).

3. Output of power paid at the offered price for thermal power plant with the offered price greater than the market price ceiling in transaction cycle determined as follows:

a) Determining the generating sets with the offered price higher than the price ceiling scheduled to calculate the market price for transaction cycle i and metering location of such generating set;

b) Calculating the output of power paid at the offered price at each metering location determined at Point a of this Clause by the following formular:

 if  and ≥ 0

 if  and < 0

if

In which:

i: i^th transaction cycle;

j: j^th metering point of thermal power plant, determined under Point a of this Clause;

: Output of powet paid at the offered price at metering location j in transaction cycle i (kWh);

: Metered power output at the metering location j trong transaction cycle i (kWh);

: Output of power in proportion to the capacity with the offered price lower than or equal to the market price ceiling in transaction cycle i of generating sets connected to the metering location j and converted to such metering location (kWh);

: Output of power in proportion to the capacity with the offered price higher the market price ceiling and arranged in the schedule of market price calculation in transaction cycle i of generating sets connected to the metering location j and converted to such metering location (kWh);

: Power output generated for difference compared with the output mobilized by the dispatching order of generating sets connected to the metering location j and converted to such metering location (kWh).

c) Calculating the output of power paid at the offered price for the power plant by the following formula:

In which:

j: j^th metering point of thermal power plant, determined under Point a of this Clause;

J: Total of metering points of power plant having generating set with the offered price higher than the market price ceiling and scheduled for calculation of market price;

: Output of power paid at the offered price of power plant in transaction cycle i (kWh);

: Output of power paid at the offered price at the metering location j in transaction cycle i (kWh).

4. Output of power increasingly generated of the power plant in transaction cycle determined in the order as follows:

a) Calculating the power output increasingly generated in transaction cycle at the terminal of generating set by the following formular:

If Qdu > 0:

If Qdu ≤ 0:

In which:

: Power out increasingly generated of generating set counted at the terminal in transaction cycle i (kWh);

: Paid and metered output of generating set g in transaction cycle i converted to the terminal of generating set (kWh);

i: i^th transaction cycle;

J: Number of times of changed dispatching order in transaction cycle i;

: j^th moment in transaction cycle i where the electricity system and market operating Unit issues the dispatching order to change capacity of generating set due to constraint (minute). If at this moment but the capacity of generating set is lower than then is determined as the moment when the generating set reaches the capacity  ;

: Moment when the generating set reaches the capacity dispatched by the electricity system and market operating Unit at the moment  (minute); If at this moment but the capacity of generating set is lower than  then  is determined as the moment when the generating set reaches the capacity ;

: Capacity of generating set arranged in the market electricity price calculation schedule in transaction cycle i (kW);

: Capacity dispatched by the electricity system and market operating Unit mo6ngthe generating set at the moment . If this capacity is less than  then such capacity is calculated by ;

: Capacity reached by the generating set at the moment ;

: Power output generated for difference compared with the output mobilized by the dispatching order converted to the terminal of generator (Qdu);

The period from the moment of dispatching order  capacity  to the moment  when the generating set reaches the capacityis determined as follows:

In which:

a: Speed of load increasing and reduction of the generating set registered in the scheduling price quotation (MW/minute).

b) Determining the power output increasingly generated in transaction cycle of the generating set, , by converting the output  from the terminal of generating set to the metering location. In case of start or stop of thermoelectric set (not due to breakdown), then is equal to 0;

c) Calculation of power output increasingly generated of the power plant in transaction cycle i by the following formula:

In which:

: Total output increasingly generated of the power plant in transaction cycle i (kWh)  ;

g: Generating set with increased generation of the power plant in transaction cycle i;

G: Total generating set with increased generation of the power plant in transaction cycle i;

: Output increasingly generated of generating set g in transaction cycle i (kWh).

5. The output of power paid at the price of market power of the power plant in transaction cycle i is determined by the following formula:

a) In case of power output generated for difference compared with the output mobilized by dispatching order (> 0):

b) In case of power output generated for difference compared with the output  mobilized by the negative dispatching order (< 0):

In which:

: Output of power paid at the price of market power of the power plant in transaction cycle i (kWh);

: Metered power output of the power plant in transaction cycle i (kWh);

: Power output is paid at the offered price in transaction cycle i for thermal power plants having their offered price higher than the market price ceiling (kWh);

: Power output increasingly generated of power plant in transaction cycle i (kWh);

: Power output generated for difference compared with the output mobilized by the dispatching order in transaction cycle i.

Article 71. Adjusting the power output for payment in electricity market

1. The components of power output for payment in the market is adjusted in the following cases:

a) If in transition cycle i, the metered power output of the power plant is less than or equal to the hourly contract power output (≤ );

b) If in transaction cycle i, the metered power output of the power plant is greater than the hourly contract output of the power plant (> ) and the power output paid at the price of market power of power plant is less than the output of hourly contract (< ).

2. The electricity system and market operating Unit shall calculate and re-adjust the components of power output for payment in the market in transaction cycles specified in Clause 1, Article 68 of this Circular, based on the following output components:

a) The hourly contract power output of power plant in transaction cycle i () is determined under the provisions in Article 37 of this Circular;

b) The power output paid at the market power price (Qsmpi) of the power plant in transaction cycle i is determined under the provisions in Clause 5, Article 68 of this Circular;

c) Metered power output of power plant in transition cycle i ().

3. Principles of adjustment

a) In the case specified under Point a, Clause 1 of this Article, the power output increasingly generated (Qconi) and the power output paid at the offered price for the power plants having their offered price higher than the market price ceiling (Qbpi) adjusted in such transaction cycle is equal to 0 (Qconi = 0; Qbpi = 0);

b) In the case specified under Point b, Clause 1 of this Article, the power output for payment in electricity market is adjusted on the principle of ensuring no change of metered power output in such transaction cycle and under the provisions in the Procedures for scheduling and mobilizing the generating sets, real-time operation and calculate the payment in the electricity market which the Electricity Regulatory Authority has issued.

Article 72. Payment of market power

1. The electricity system and market operating Unit shall calculate the total of payment of market power of power plant in transaction cycle by the following method:

In which:

Rg: Total payments of market power in the payment cycle (dong);

Rsmp: Payment for output to be paid at the price of market power in the payment cycle (dong);

Rbp: Payment for output to be paid at the offered price for thermal power plants having their offered price higher than the market price ceiling in the payment (dong);

: Payment for the power output increasingly generated in the payment cycle (dong);

Rdu: Payment for the power out generated for difference compared with the output mobilized by the the dispatching order in payment cycle (dong).

2. The payment for the output to be paid at the price of market power of power plant in transaction cycle determined in the order as follows:

a) Calculation for each transaction cycle by the following formula:

In which:

: Payment for the output to be paid at the price of market power of power plant of transaction cycle i in payment cycle (dong);

SMPi : Price of market power of transaction cycle i in the payment cycle (dong/kWh);

: Power out to be paid at the price of market power of transaction cycle i in payment cycle (kWh)

b) Calculation of payment cycle by the following method:

In which:

: Payment for the output to be paid at the price of market power in the payment cycle (dong);

i: i^th transaction cycle in the payment cycle;

I: Total transaction cycles of payment cycle;

: Payment for the output to be paid at the price of market power of power plant of transaction cycle i (dong).

3. The payment for the output to be paid at the offered price for thermal power plants having their offered price higher than the market price ceiling in payment cycle determined in the order as follows:

a) Calculation for each transaction cycle by the following method:

In which:

: Payment for power with higher offered price than the price ceiling of power plant in transaction cycle i (dong);

j: j^th price band in the quotation of generating sets of thermal power plants having their offered price higher than the market price ceiling and arranged in the schedule of market power price calculation;

J: Total price bands in price quotation of thermal power plants having their offered price higher than the market price ceiling;

: Offered price corresponding to price band i in quotation of generating sets of thermal power plant g in transaction cycle i (dong/kWh);

: Highestoffered price in price bands arranged in the schedule of market power price calculation of thermal power plant in transaction cycle i (dong/kWh);

: Total capacity offered at the price  in the quotation of thermal power plant mobilized in transaction cycle i and converted to the metering location (kWh);

: Total power output with offered price higher than the market price ceiling of thermal power plant in transaction cycle i (kWh).

b) Calculation for payment cycle by the following formula:

In which:

 : Payment for power offered at the price higher than the price ceiling of power plant in payment cycle (dong);

i: Transaction cycle i in which the power plants are mobilized with their offered price higher than the price ceiling;

I: Total transaction cycles in which the power plants are mobilized with their offered price higher than the price ceiling;

: Payment for power offered at the price higher than the price ceiling of power plant in transaction cycle i (dong).

4. The payment for the power output increasingly generated of power plant in transaction cycle determined in the order as following:

a) Calculation for each transaction cycle by the following formula:

In which:

: Payment for power output increasingly generated in transaction cycle i (dong);

g: Generating set with increased generation of power plant in transaction cycle i;

G: Total generating sets with increased generation of power plant in transaction cycle i;

: Power increasingly generated of generating set g in transaction cycle i (kWh);

: The highest offered price corresponding to the capacity band increasingly generated of generating set g in transaction cycle i (dong/kWh). For hydropower plants, if such offered price is higher than the price ceiling of electricity market, the price ceiling of electricity market shall be taken.

b) Calculation for payment cycle by the following formula:

In which:

Rcon: Payment for power output increasingly generated in payment cycle (dong);

i: i^th transaction cycle of payment cycle in which the power plant must have additional power generation by the dispatching order;

I: Total transaction cycles of payment cycle in which the power plant must have additional power generation by the dispatching order;

Rconi : Payment for power output increasingly generated in transaction cycle i (dong).

5. Where the hydropower plants are mobilized for generation due to constrained conditions with their offered price higher than the market price ceiling or their capacity is mobilized with price band higher than the market price ceiling, such plants shall be paid for the corresponding generated output in that cycle at the market price ceiling.

6. The payment for power output generated for difference compared with the output mobilized by the dispatching order of the power plant in transaction cycle.

a) Calculation for each transaction cycle by the following formula:

- In case of power output increasingly generated compared with the dispatching order:

In which:

: Payment for power output generated for difference compared with the dispatching order in transaction cycle i (dong);

g: Generating set with increased generation compared with the dispatching order of power plant in transaction cycle i;

G: Total generating sets with increased generation compared with the dispatching order of power plant in transaction cycle i;

: Power increasingly generated compared with the dispatching order of generating set g in transaction cycle i (kWh);

: The lowest offered price of all generating sets in transaction cycle i (dong/kWh)

- In case of power output decreasingly generated compared with dispatching order:

In which:

: Payment for power output generated for difference compared with dispatching order in transaction cycle i (dong);

g: Generating set with decreasing generation compared with the dispatching order of power plant in transaction cycle i;

G: Total generating sets with decreasing generation compared with the dispatching order of power plant in transaction cycle i;

: Power decreasingly generated compared with the dispatching order of generating set g in transaction cycle i (kWh);

SMPi : Price of market power in transaction cycle i (dong/kWh);

Pbpi,max: Power price of the most expensive generating set paid in transaction cycle i;

b) Calculation for payment cycle by the following formula:

In which:

: Payment for power output generated for difference compared with the dispatching order in payment cycle (dong);

i: i^th transaction cycle of payment cycle in which the thermal power plant has generated for difference compared with dispatching order;

I: Total transaction cycle of payment cycle in which the thermal power plant has generated for difference compared with dispatching order;

: Payment for power output generated for difference compared with the output mobilized by the dispatching order in transaction cycle i (dong)..

Article 73. Payment of market capacity

The electricity system and market operating Unit shall calculate the payment of market power for the power plant in transaction cycle in the order as follows:

1. Calculation for each transaction cycle by the following formula:

In which:

: Capacity payment for power plant in transaction cycle i (dong);

g: Generating set of power plant is paid at the capacity price;

G: Total generating sets of power plant paid at the capacity price;

: Price of market capacity in transaction cycle i (dong/kW);

: Amount of paid capacity of generating set g in transaction cycle i converted to the metering location (kW).

2. Calculation for each transaction cycle by the following formula:

In which:

Rcan: Capacity payment for power plant in payment cycle (dong);

i: i^th transaction cycle in payment cycle;

I: Total transaction cycles in payment cycle;

Rcani : Capacity payment for the power plant in transaction cycle i (dong).

Article 74. Payment under electricity sale contract for difference

Based on the price of market power and market capacity which the electricity system and market operating Unit announces, the electricity generating Units shall calculate the payment under the electricity sale contract for difference in payment cycle in the order as follows:

Calculation for each transaction cycle by the following formula:

In which:

: Payment for difference in transaction cycle i (dong);

: Power output paid at contract price in transaction cycle i (kWh);

P­_c: Price of electricity sale contract for difference (dong/kWh). For hydropower plants, such contract price does not include the tax of water resources and forest environment fees;

SMP_i: Price of market power in transaction cycle i (dong/kWh);

CAN_i: Price of market capacity in transaction cycle i (dong/kWh).

Calculation for each transaction cycle by the following formula:

In which:

Rc: Other payment for difference in payment cycle (dong);

i: i^th transaction cycle of payment cycle;

I: Total transaction cyles of payment cycle;

: Other payment for difference in transaction cycle i (dong).

Article 75. Payment upon intervention in electricity market

1. Where the time for market intervention is less than 24 hours, the electricity generating Units shall receive the payments specified in Article 72, 73 and 74 at the price of market power and the amount of paid capacity specified in Article 69 of this Circular.

2. Where the time for market intervention is less than 24 hours, the electricity generating Units shall be paid at the contract price for all metered power output.

Article 76. Payment upon stop of electricity market

During stop of electricity market, the electricity generating Units shall be paid at the contract price for all metered power output.

Section 4: PAYMENT OF AUXILIARY SERVICES AND OTHER PAYMENTS

Article 77. Payment for spinning backup services and frequency modulation services

The electricity system and market operating Unit shall calculate the payment to the electricity generating Units providing the spinning backup services and frequency modulation services as stipulated by the Ministry of Industry and Trade.

Article 78. Payment for quick start backup services, cold backup services, generation operation services due to the constrained security of electricity system, voltage adjustment and black start services

The Units providing the quick start backup services, cold backup services, generation operation services due to the constrained security of electricity system, voltage adjustment and black start services shall be paid under the auxiliary services supply contract in the form issued by the Ministry of Industry and Trade.

Article 79. Payment for hydropower plants having reservoir with regulation capability of less than 02 days

1. Calculating and paying revenues of each transaction cycle for hydropower plants having reservoir with regulation capability of less than 02 days by the following formula:

Rg_i = Pc × (Qhc_i × α) + (CAN_i + SMP_i) × (Qhc_i ×(1 - α)) + Rdu_i

In which:

Rg_i: Payment for hydropower plants having reservoir with regulation capability of less than 02 days in transaction cycle i (dong);

Pc: Price of electricity sale contract (dong/kWh);

Qhc_i: Power output adjusted in transaction cycle i (kWh) is determined as follows:

- If Qdu_i > 0, Qhc_i = Qm_i - Qdu_i;

- If Qdu_i ≤ 0, Qhc_i = Qm_i.

Qm_i: Power output at the metering location in transaction cycle i (kWh);

Qdu_i: Power output generated for difference compared with the dispatching order (kWh) in transaction cycle i.

Rdu_i: Payment for power output generated for difference compared with the the output mobilized by the dispatching order in transaction cycle i (dong);

SMP_i: Price of market power in transaction cycle i (dong/kWh);

CAN_i: Price of market capacity in transaction cycle i (dong/kWh);

α: Percentage of power output paid at contract price for hydropower plants having reservoirs with regulation capability of less than 02 days.

The electricity generating Units shall calculate the payment at the price of electricity sale contract (Pc × Qhc_i × α). The electricity system and market operating Unit shall calculate the remaining payments.

2. Payment made for payment cycle by the following formula:

In which:

: Payment for plant having reservoir with regulation capability of less than 02 days (dong);

i: i^th transaction cycle of payment cycle;

I: Total transaction cycles of payment cycle;

Rg_i: Payment for power plant having reservoir with regulation capability of less than 02 days in transaction cycle i(dong);

Article 80. Other payments

1. The electricity generating Units having generating sets or receiving reactive capacity in the mode of synchronous compensation running shall be paid for the active power amount receiving from power grid under the provisions in electricity sale contract.

2. Where the monthly power metering output provided by the power metering data managing Units under the provisions in Clause 2, Article 65 has a difference compared with the total metered power of days in month provided by the power metering data managing Units under the provisions in Clause 1, Article 65 of this Circular. The difference of power shall be paid at the price of electricity sale contract signed between the single wholesaling Units  and the electricity generating Units.

3. The thermoelectric sets are required to stop operating as stipulated under Point dd, Clause 3, Article 55 of this Circular or must stop 01 boiler to reduce capacity as stipulated under Point b, Clause 3, Article 55 of this Circular shall be paid the start cost as agreed between the single wholesaling Units  and the electricity generating Units. The electricity system and market operating Unit must confirm such events for generating sets which the electricity generating Units as a basis for payment of start cost for the single wholesaling Units .

4. Where the generating sets are constrained to decrease their capacity due to violation of limit of thermal grid related to direct transmission of capacity of power plant to the system but the cause is not due to the fault of power plant leading to the failure to ensure their hourly contract output, then the hourly contract output in contrained cycles must be generated with reduced capacity applied to the payment in electricity market of the plant adjusted by the output actually generated of the plant in such transaction cycle. The electricity generating Units and the single wholesaling Units   shall modify and supplement the annex of monthly contract output as a basis for payment. Where the generating sets must be re-started, they shall be paid the start cost as agreed between the single wholesaling Units  and the electricity generating Units.

5. Where the generating sets are constrained to decrease their capacity or stop operation for repair or maintenance of line directly connected to power plant or the related lines leading to the power cut of line directly connected to power plant leading to the failure to ensure the hourly contract output, the hourly contract output in relevant cycles applied for payment in electricity market of the power plant adjusted by the output actually generated of the power plant in such transaction cycle. The electricity generating Units and the single wholesaling Units  shall modify or supplement the annex of monthly contract output as a basis for payment. Where the generating sets must be re-started, they shall be paid the start cost as agreed between the single wholesaling Units  and the electricity generating Units.

6. Where the power plants have the testing generating sets, such power plants shall be separated from the electricity market in the testing running cycles. The total generated output of power plant to the grid in cycles with testing paid under the provisions in the electricity sale contract signed with the single wholesaling Units  corresponding to the configuration of generating sets and type of fuel used.

7. Where the gas turbine power plants must stop their operation and re-start as required by the electricity system and market operating Unit for the reason of system security during the time the available single cycle generating sets operate with mixed fuel or not main fuel, such plants shall be paid the start cost as agreed between the electricity generating Units and single wholesaling Units .

8. Where the gas turbine power plants sharing the same heat recovery steam have the moment of operation of single cycle, operation with mixed fuel or not main fuel as required by the electricity system and market operating Unit to ensure the security of electricity system, such transaction cycles are paid at the price of power in the electricity sale contract signed with the single wholesaling Units   corresponding to the configuration of generating set upon operation with single cycle or operation with mixed fuel or not main fuel.

9. Where the gas turbine power plants temporarily and indirectly participating in electricity market at the request of the electricity system and market operating Unit to ensure the security of electricity system, the total power output of power plant in relevant transaction cycles shall be paid at the price of electricity sale contract. During the time of temporary and indirect participation in electricity market, if such plants must stop and re-start at the request of the electricity system and market operating Unit, such plants shall be paid the start cost as agreed between the single wholesaling Units  and the electricity generating Units

10. Where the generating sets have an approved plan for stop of operation but still have to generate their capacity at the request of the electricity system and market operating Unit to ensure the security of electricity system, such power plant shall be separated totally from the electricity market during the time of capacity generation at the request of the electricity system and market operating Unit. The total generated capacity of the plant to the grid during such period of time shall be paid at the electricity price specified in the electricity sale contract signed with the single wholesaling Units .

11. Where the power plants with generating sets separated from grid for independent generation at the request of the electricity system and market operating Unit, the total power output of such plants in relevant transaction cycles shall be paid at the electricity price specified in the electricity sale contract signed with the single wholesaling Units .

12. Where the power plants with generating sets separated from the national electricity system and connected to the power grid purchased from foreign country, the total power output of such power plants in transaction days shall be paid at the electricity price specified in the electricity sale contract signed with the single wholesaling Units .

13. Where the hydroelectric generating sets must generate their capacity greater than the announced capacity in the quotation of next days at the request of the electricity system and market operating Unit because of security of electricity system, the total generated output of the power plants to the grid during such period of time shall be paid at the electricity price specified in the electricity sale contract signed with the single wholesaling Units .

14. Where the hydropower plants participate in adjusting level 1 frequency at the request of the electricity system and market operating Unit, the total generated output of such plants in relevant cycles shall be paid as per the mechanism of hydropower plants having reservoirs with regulation capability of less than 02 days, not taking in account the power output generated for difference compared with dispatching order (Qdu=0). The hydropower plants of the same group with the ladder hydropower plants (if any) of the plants participating in level 1 frequency modulation shall be paid as per the mechanism of hydropower plants having reservoirs with regulation capability of less than 02 days, taking in account the power output generated for difference compared with dispatching order.

Section 5: ORDER AND PAYMENT PROCEDURES

Article 81. Data for calculation and payment for electricity market

Before 9:00 am of day D+2, the electricity system and market operating Unit shall aggregate and provide the single wholesaling Units  and the electricity generating Units with data for calculation and payment for each power plant under the provisions specified in Annex 6 of this Circular.

Article 82. Electricity market payment list for transaction days

1. Before day D+4, the electricity system and market operating Unit shall prepare and send the single wholesaling Units  and the electricity generating Units the preliminary electricity market payment list for transaction day D via the website of electricity market under the form specified in Annex 4 of this Circular.

2. Before day D+6, the electricity generating Units directly doing transactions and the single wholesaling Units  shall confirm the electricity market payment list under regulations on the website of electricity market and inform the electricity system and market operating Unit of errors in the preliminary electricity market payment list (if any).

3. On day D+6, the electricity system and market operating Unit shall prepare and send the single wholesaling Units  and the electricity generating Units the complete electricity market payment list for day D via the website of electricity market under the form specified in Annex 4 of this Circular. The electricity generating Units shall issue the daily payment list and file it in dossier for payment for payment cycle.

Article 83. Electricity market payment list for payment cycle

1. The electricity system and market operating Unit shall aggregate the payment data for all transaction days in the payment cycle and verify and compare it with the summary record of power output provided by the power metering managing Units.

2. Within 10 working days from the last transaction day of the payment cycle, the electricity system and market operating Unit shall prepare and issue the electricity market payment list for payment cycle.

3. The electricity system and market operating Unit shall prepare and issue the electricity market payment list of the payment cycle to the single wholesaling Units  and the electricity generating Units.

4. The electricity market payment list for the payment cycle consists of a summary under the form specified in Annex 5 of this Circular and a written confirmation of meter readings and power output

Article 84. Dossier of power dossier

1. The electricity generating Units directly doing transaction shall prepare and send the payment voucher of electricity market to the single wholesaling Units  based on the electricity market payment list for the payment cycle.

2. The electricity generating Units shall prepare and send the payment voucher of contract to the single wholesaling Units  under the provisions in the electricity sale contract signed between the single wholesaling Units  and the electricity generating Units.

3. Before the 20^th date of every month, the electricity generating Units directly doing transaction shall prepare and send the payment voucher to the single wholesaling Units . Such voucher consists of payments of electricity market and contract in the payment cycle.

Article 85. Dossier payment for auxiliary services supply contract

The electricity generating Units shall prepare the dossier of payment for auxiliary services under the auxiliary services supply contract between the electricity generating Units and the electricity system and market operating Unit.

Article 86. Voucher modification

1. In case of errors of voucher, the electricity generating Units or the single wholesaling Units  has the right to request the handling under the relevant current regulations within 01 month from the issue date. The parties concerned shall coordinate to determine and agree upon the modified payments.

2. The electricity generating Units shall supplement the modified payments to the voucher of the next payment cycle.

Article 87. Payment

1. The single wholesaling Units and the electricity system and market operating Unit shall make payment as per the voucher of the electricity generating Units. The time limit for payment is based on the provisions in the electricity sale contract signed between the two parties.

2. The electricity generating Units and the single wholesaling Units  shall agree upon the payment mode in the electricity market in accordance with the provisions in this Circular and other relevant provisions.

3. Where on the 20^th date of every month, if the electricity generating Units has not received the electricity market payment list but the cause is not from the fault of the electricity generating Units, such Units has the right to prepare and send the temporary dossier and payment voucher based on the generated power output and the price of electricity sale contract. After the electricity market payment list is issued, the difference between the value of temporary and the value of settlement shall be offset in the next month.

Article 88. Handling of errors in payment

In case of surplus or deficit payment compared with the vouchers, the Units concerned shall handle such errors under the provisions specified in the electricity sale contract or the auxiliary service supply contract.