Who can participate?
| |
Generation |
Demand |
| BMU |
yes |
yes |
| Non-BMU |
yes |
yes |
Service Description
An intertrip will automatically disconnect a generator or demand from the Transmission System when a specific event occurs. There are two types of intertrip service, Commercial Intertrips, and System to Generator Operational Intertrips.
The automatic operation of intertrip generally requires the monitoring of all transmission circuits in a zone which are linked with system protection arrangements. If a selected circuit trips, the logic process will then trigger activation of the scheme to disconnect generation or demand.
Intertrips may be required as a condition of connection, and some Intertrips may also be used to manage transmission constraints.
Why is it needed?
The intertrip services are required as an automatic control arrangement where generation or demand may be reduced or disconnected following a system fault event to relieve localised network overloads, maintain system stability, manage system voltages and/or ensure quick restoration of the transmission system.
Major Technical Requirements
Technical Requirements for an operational and commercial intertripping scheme will generally be defined at the time Connection Agreements are being established. However, commercial schemes may be applied to existing power stations by agreement. The service requirements are specific to the location of the Intertrip.
Procurement Process
System to Generator Operational Intertripping: specified at the time of Connection Agreement being entered into.
Commercial Intertrips: may be specified at the time of Connection Agreement being entered into, or negotiated on an ad-hoc basis.
Payment
Payment Structure: Payments for operational intertrips are administered via the CUSC. Two kinds of payment would be made for certain kind of intertrip:
(i) Capability Payment (£/Settlement Period), and,
(ii) Intertrip Payment (£/Generating Unit/Trip).
The payment structure for commercial intertrips generally mirrors that of operational intertrips.
BSAD: System to Generator Operational Intertrips: Intertrip volumes are included in BSAD and are calculated in accordance with the methodology outlined within the BSAD Methodology Statement.
ABSVD: Commercial Intertrips: Energy Volumes as a result of the operation of the commercial intertrip will be calculated in accordance with the relevant Commercial Services Agreement.
System to Generator Operational Intertripping: Utilisation volumes will be calculated in accordance with Part C of the ABSVD Methodology Statement. For the avoidance of doubt, where an intertripping scheme is Category 1 Intertripping Scheme as defined in the CUSC and determined within a generator’s Bilateral Connection Agreement.
Summary of Further Information
CUSC Section 4.2A