Prices for imbalance 2003
The imbalance of a given Access Responsible Party is the quarter-hourly difference
between:
§
his total injections within his balance perimeter, namely injections at injection points
within the Elia Grid, injections in the Elia Grid coming from any other system
belonging to the balancing zone operated by Elia, imports, purchases from other
Access Responsible Parties; and
§
his total offtakes within his balance perimeter, namely offtakes at offtakes points
within the Elia Grid, offtakes from the Elia Grid made in any other system belonging
to the balancing zone operated by Elia, exports, sales to other Access Responsible
Parties, the losses attributed to this Access Responsible Party.
Prices for imbalance are based on the notion of a threshold.
The threshold of every Access Responsible Party is defined on the basis of its size as
illustrated below.
The size of an Access Responsible Party is the sum of offtakes at offtake points in the Elia
Grid and the offtakes from the Elia Grid made in any other system belonging to the
balancing zone operated by Elia for a given quarter hour. 10% of this size is the threshold
of the ARP for a given quarter hour with a minimum threshold of 1 MW and a maximum of
100 MW.
If the Imbalance is negative (offtake exceeding injection), prices for “injection less than
offtake” are applied and paid by the Access Responsible Party to Elia. If the Imbalance is
positive (injection exceeding offtake), prices for “injection exceeding offtake” below are
applied and paid by Elia to the Access Responsible Party.
When the absolute value of the Imbalance is below the threshold T, this value is multiplied
by 15 minutes and is charged according to the prices mentioned in Table 1..
When the absolute value of the Imbalance is above the threshold T, this value is multiplied
by 15 minutes and is charged according to the prices mentioned in Table 2.
The prices are differentiated according to “Day period” and “Night period”.
“Day period” : from 07h00 until 23h00 Brussels time
“Night period” : from 23h00 until 24h00 , and, from 00h00 until 07h00 Brussels time
Table 1 : Prices for imbalances below the threshold T
Prices in € / MWh
Day period
Night period
Injection less than offtake
AN
BN
Injection exceeding offtake
AP
BP
where :
AN = min ( (175% APX)
BN = min ( (175% APX)
AP = min ( (25% APX) ,
BP = min ( (25% APX) ,
, LAN );
, LBN );
LAP );
LBP );
with for the months of January, February, November and December:
LAN = 60 € / MWh ;
LBN = 30 € / MWh ;
LAP = 30 € / MWh ;
LBP = 20 € / MWh.
and with for the other months:
LAN = 50 € / MWh ;
LBN = 25 € / MWh ;
LAP = 25 € / MWh ;
LBP = 15 € / MWh.
Table 2 : Prices for imbalances above the threshold T
Prices in € / MWh
Day period
Night period
Injection less than offtake
CN
DN
Injection exceeding offtake
CP
DP
where :
CN = min ( CNX , LCN ) * Krec ;
DN = min ( DNX , LDN ) * Krec ;
CP = max ( CPX , LCP ) / Krec ;
DP = max ( DPX , LDP ) / Krec ;
with :
LCN = 150 € / MWh ;
LDN = 150 € / MWh ;
LCP = 0 € / MWh ;
LDP = 0 € / MWh ;
and with :
CNX = AN + SLCN * ( | imbalance | - T) where SLCN = ( LCN - AN) / T ;
DNX = BN + SLDN * ( | imbalance | - T ) where SLDN = ( LDN - BN) / T ;
CPX = AP - SLCP * ( | imbalance | - T ) where SLCP = ( AP - LCP) / T ;
DPX = BP - SLDP * ( | imbalance | - T ) where SLDP = ( BP - LDP) / T ;
Krec is the recurrence coefficient and equals :
§
1.00 when Nimb is smaller than 100 ;
§
(Nimb / 100 ) when Nimb is greater than 99 and smaller than 200 ;
§
2.00 when Nimb is greater than 199;
§
where Nimb is the number of quarter hours with Imbalance, in absolute value,
above the threshold during the 500 most recent quarter hours preceeding the
concerned quarter hour.
When the highest value of (110 % *APX ; 110% * Powernext) is greater than LCN, the
above mentioned price CN is multiplied by the highest value of (110 % *APX ; 110% *
Powernext) and is divided by LCN.
When the highest value of (110 % *APX ; 110% * Powernext) is greater than LDN, the
above mentioned price DN is multiplied by the highest value of (110 % *APX ; 110% *
Powernext) and is divided by LDN.
N.B.
§
In the above mentioned prices: the notation “APX” refers to the price of energy on the Day Ahead Market for the
Dutch Hub of the Amsterdam Power Exchange, related to the concerned quarter hour and expressed in €/MWh;
and
§
the notation “Powernext” refers to the price of energy on the Powernext exchange, managed by Euronext,
related to the concerned quarter hour and expressed in €/MWh.