|European Union Electricity Market Glossary|
Schedules are a tool for the Transmission System Operators (TSOs) for planning system operation after market closure before real time.
Schedules are agreed plans from generation and consumption units as well as internal and external commercial exchanges and exchanges between TSOs.
Schedules provide the necessary information for the TSO to operate and balance the system as well to carry out security analysis.
According to Article 3(2)(78) of the Network Code on System Operation the 'generation schedule’ is a schedule representing the electricity generation of a power generating module or of a group of power generating modules.
Scheduling agent’ is the entity or entities with the task of providing schedules from market participants to TSOs, or where applicable third parties (Article 3(2)(90) of the Network Code on System Operation).
Network Code on System Operation stipulates that the concerned owner is required to appoint or to act as a scheduling agent for each power generating facility and demand facility subject to requirements for scheduling set out in the national terms and conditions.
It is moreover, stipulated that each market participant and shipping agent, subject to requirements for scheduling set out in the national terms and conditions, must appoint or act as a scheduling agent (Article 110 (3) and (4) of the Network Code on System Operation).
Network Code on System Operation lays down the following rules for establishing scheduling areas (Article 110(2)):
- where a bidding zone covers only one control area, the geographical scope of the scheduling area is equal to the bidding zone,
Rules for scheduling
All schedules in a scheduling area should sum up to zero within a time period to keep the system in balance, if no faults occur and both consumption and production will be equal to the prognosis.
This enables the TSO to balance its system in real time with a minimum level of reserves for balancing, compared to the extensive level of reserves necessary if no schedules are available.
Schedules provide the TSO with valuable insight; if the schedules do not sum up to zero, the TSO will have time to inform proactively the market players of potential mistakes instead of experiencing potential enormous imbalances in real time. This increases security of supply and is more economical.
Scheduling in the market coupling process
The output of a market coupling process, i.e. energy exchanges, results in new requirements for TSOs and market coupling operators (scheduling "net positions").
Scheduling "net positions" means a multilateral exchange between one scheduling area and a group of other scheduling areas involved in market coupling.
The group of other scheduling areas involved in market coupling will be modelled as a specific scheduling area without generation or consumption and where the sum of all imports is equal to the sum of all exports.
All involved scheduling areas in the market coupling have a border with the specific scheduling area, except if the local situation requires bilateral exchanges between two scheduling areas.
The scheduling agent of the market coupling operator acts as operator of this specific scheduling area.
Market coupling operators act to ensure that all external schedules between scheduling areas are balanced.
Within market coupling process, multilateral exchanges between scheduling areas is the standard, but also bilateral exchanges may be required in order to allow for regional variations.
Bilateral exchanges also take place if one of the scheduling areas does not participate in market coupling.
Network Code on System Operation, Articles 110 - 113
|Last Updated on Thursday, 21 September 2017 20:56|