Daily Balancing Costs 2020-2021

On a settlement period basis, the total balancing cost (per MWh) is given, alongside the total volume of services provided and an average cost for the settlement period.

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Table Information

SETT_DATE

Title Settlement Date
Type date
Description The Payment Date in relation to an Initial Settlement Run.
Comment
Example 22/03/2020
Unit

SETT_PERIOD

Title Settlement Period
Type integer
Description A period of 30 minutes beginning on the hour or the half-hour.
Comment On the first day of BST when clock change happens there will be 46 half hours (SP's) in the day. Similarly the first day of GMT will have 50 half hours as the clock goes back 1 hour at 2am.
Example 15
Unit

Energy Imbalance

Title Energy Imbalance
Type number
Description Energy imbalance is the difference between the amount of energy generated in real time, the amount of energy consumed during that same time, and the amount of energy sold ahead of the generation time for that specific time period. The monthly energy imbalance cost can be negative or positive depending whether the market was predominantly long or short.
Comment The Energy Imbalance could be a negative number
Example 5.23
Unit £m

Frequency Control

Title Frequency Control
Type number
Description Response and Fast reserve
Comment
Example 8.1
Unit £m

Positive Reserve

Title Positive Reserve
Type number
Description Positive Reserve is required to operate the transmission system securely and provides the reserve energy required to meet the demand when there are shortfalls, due to demand forecast changes or generation breakdowns.
Comment
Example 12.2
Unit £m

Negative Reserve

Title Negative Reserve
Type number
Description A Negative Reserve service can provide the flexibility to reduce generation or increase demand to ensure supply and demand are balanced. The service is held in reserve to cover unforeseen fluctuations in demand, or generation from demand side PV and wind.
Comment
Example 5.6
Unit £m

Constraints

Title
Type
Description Running the transmission network also requires actions to protect equipment, enable access to the system, keep within the Security and Quality of Supply Standard (SQSS) and prevent the loss of large parts of the network. In order to do this, we sometimes ask a generator to reduce, or constrain, the amount of electricity it’s producing. When we do that, we still need the electricity it would have produced – so we can balance the system – but we can’t move it in or out of a certain area. We make up the difference by buying energy from another generator in a different part of the transmission network. It can also happen the other way around: we might need to produce more energy in some areas, which means we need to reduce production elsewhere.
Comment
Example 15.2
Unit £m

Other

Title Other
Type number
Description BM actions, which are not easily accounted for in the previously reported categories. Other general costs; trading option fees, bank charges, sterling adjustments. Non-Delivery and Reconciliation
Comment
Example 5.0
Unit £m