N ational Grid Obligations owner & operator of high voltage transmission system in England & Wales offer connection to anyone who applies (within 3 months) offer use of system to anyone who applies (within 28 days) charge on the basis of approved charging principles wind generators treated like any other generator - but is tailoring needed?
National Grid Obligations - Issues If connection interface is onshore, then existing procedures address: direct transmission connection; or ‘use of system’ if distribution connected However, do obligations extend offshore? If so are connections regulated or not? are charging principles same as onshore?
ACS Power Flow Pattern for 2003/04 generation demand SCOTLAND UPPER NORTH NORTH MIDLANDS CENTRAL ESTUARY SOUTH WESTFRANCE B1 B2 B3 B7 B9 2200 30553356 1948614056 94968190 57162736 1976 11973044 13238 24983 4956 1899 7329 8635 1847
Reinforcement - Issues Potentially significant costs (UK studies in progress) Basis of investment Contractual? Strategic? Market determined? (Tx Access?) Timing/consents Reinforce then connect? Connect then reinforce?
Commercial, Regulatory & Charging Shallow connection (for transmission): minimum capital cost scheme charges based on scheme specific costs sharing with subsequent users Deeper infrastructure: guarantees sought from connectees but costs shared via TNUoS tariff
Connection - Issues Individual transmission connections expensive for wind developments Sharing connections reduces costs to connectees Is there a role for National Grid in finding partners? Are changes to connection charging principles needed? – connection tariff – shallower boundary
System Infrastructure Charges Based on contracted developments locationally based tariff – reflects incremental network reinforcement costs on both demand and generation who use capacity capacity-based charges – highest registered capacity of directly connected generator – triad demand contribution (basis of embedded benefit) Future review likely (eg. Tx Access)
Conclusions Wind can get access to the transmission network now Potential benefits in tailoring processes to achieve necessary connection sharing Need to clarify off-shore ground-rules Significant challenges from access review Constructive dialogue underway “Getting Connected Guide” see www.nationalgrid.com/uk/library/
National Grid UK overview Scotland France Key Statistics 2001 Installed Capacity67.9 GW Max Demand 53.2 GW Energy Supplied303 TWh Route km 7650 km No. of Substations 300