Flexible Power is looking to procure three services, each cater to different network requirements.
WPD will procure services in alignment with the services described in the ENA’S Open Networks Project DSO ON Service Definitions document; ONSWSP210SEP18.
(ON Service definition – pre-fault constraint management)
The Secure service is used to manage peak demand loading on the network and pre-emptively reduce network loading. This service is expected to be required on weekday evenings and may occur throughout the year due to the seasonal ratings of assets. (Specific requirements are defined later in the document).
As these requirements are predictable, Secure requirements are declared each Thursday for the following week (commencing Monday). Payments consist of an Arming fee which is credited when the service is scheduled and a further utilisation payment awarded on delivery. The week-ahead declarations are scheduled to allow customers to participate in alternative services when not required for the Secure service.
(ON Service definition – post-fault constraint management)
The Dynamic service has been developed to support the network in the event of specific fault conditions, often during summer maintenance work. (Specific requirements are defined later in the document). As the service is required following a network fault, it consists of an Availability and Utilisation fee. By accepting an Availability fee, participants are expected to be ready to respond to Utilisation calls within 15 minutes. Dynamic availability windows are declared each Thursday for the following week (commencing Monday). The week-ahead declarations are scheduled to allow customers to participate in alternative services when not required for the Dynamic service.
(ON Service definition – restoration support management)
The Restore service is intended to help with restoration following rare fault conditions. Such events are rare and offer no warning as they depend on failure of equipment. Under such circumstances, response can be used to reduce the stress on the network. This is the purpose of Restore.
As the requirement is inherently unpredictable, Restore is based on a premium ‘utilisation only’ service. This will reward response that aids network restoration, but will pay no arming or availability fees. Participants declared available for the Restore service will be expected to respond to any utilisation calls within 15 minutes and will receive an associated utilisation fee.
|Use Case||Pre-fault mitigation||Post-fault recovery (often under planned outages)||Post-fault network restoration|
|Advanced Payment||Yes, an arming payment for the accepted availability time: £125/MW/h||Yes, an availability payment for the accepted availability time: £5/MW/h||No|
|Availability Declarations||By midnight every Wednesday for the following week (Mon-Sun)|
|Availability acceptance||By noon every Thursday for the following week (Mon-Sun)|
|Dispatch Notice||Week Ahead, on acceptance of availability||15 minutes ahead of requirement||15 Minutes ahead of requirement|