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Statement of Works

WPD are required (under the Connection and Use of System Code) to make a request for a Statement of Works (“SoW”) to National Grid Electricity Transmission plc (“NGET”) in relation to the potential impact of connection of embedded generation on the National Electricity Transmission System (NETS). 

Please click here for our SoW Guidance Document giving further details of the process.

NGET will undertake an initial assessment of the significance of the embedded generator(s) on the NETS and inform WPD of this through a SoW response.

Recent SoW requests made by WPD to NGET have highlighted widespread issues on the NETS that require mitigation. This is due to the cumulative impact of connecting new generation to the distribution system. NGET often require WPD to impose conditions on generator sites in many areas to modify the operating characteristics of the generator units. This may include, without limitation, a requirement to operate at a specific power factor, to have the capability of operating within a power factor range and/or to constrain the export capability to zero at certain times.

In certain areas NGET have indicated through their SoW response that they will have to reinforce parts of the NETS prior to the connection of any further generation capacity. Where this arises WPD will need to make a formal Modification Application to identify the detail, scope and costs of these works. Customers who initiate these works will be required to fund the cost and may need to wait for NGET to complete the reinforcement. The costs will be significant and the associated construction timescales lengthy.

Where customers are required to fund the cost of NGET’s works they may be required to assume both attributable and wider system liabilities and also provide security to cover that liability. Click here for further information on WPD’s requirements for satisfying liability and security conditions.

NGET’s SOW responses covering the WPD distribution area are available to view here. More information on the SoW process can be found here and here.

To find further Statement of Works information please view our Network Capacity Map here.

As part of a trial change to the Statement of Works process through WPD Bilateral Connection Agreements with NGET, WPD will be providing to NGET a list of relevant embedded generation connected beneath each Grid Supply Point. This contains the list of historic and proposed generation sites including size and technology, attached as an “Appendix G” to our formal agreement with NGET.  Part 5 of this Appendix provides the summary information, redacted versions of which can be found here.

If a Customer is willing to temporarily reduce their export capacity at times of peak network usage then WPD have a range of "Alternative Connections" which may allow connection with reduced costs and/or improved connection timescales. Please click here for further information regarding the types of connection WPD can offer and the areas in which these are available.


South West update

On the 27th January 2016 WPD received Modification Offers from NGET, detailing the work and/or conditions that must be met prior to the connection of generation identified in our SoW submission. See the update below:

WPD South West Statement of Works Update March 2016


South Wales update

On the 19th May 2016 WPD received notification from NGET which confirmed that their National Electricity Transmission System (NETS) in South Wales has reached capacity under peak conditions. As a result certain generation technologies that can generate at peak demand periods would not be permitted to connect, as in the short term there would not be capacity available on the NETS. Renewable types of generation such as solar and wind could continue to connect, utilising existing capacity. The notification letter can be found here.

Following notification of these restrictions WPD had a number of generators which fall under this restriction formally accept offers for connection.  As a result, WPD made a number of formal Modification Applications to NGET asking them to identify the detail, scope and costs of any reinforcement or upgrade works required to the NETS. See the update below:

WPD South Wales Statement of Works Update March 2017

West Midlands update

Port Ham

On the 3rd May 2017, WPD received notification from NGET which advised that there were significant challenges connecting additional thermal plant on the Port Ham GSP network. NGET have confirmed that the connection of further Thermal and Storage plants cannot be facilitated until completion of the wider enabling reinforcement works, currently estimated as October 2026. WPD will therefore not be in a position to energise any new thermal or storage connections to the Port Ham network until the identified NGET’s works are completed. See the update below:

Port Hams (WPD West Midlands) Statement of Works Update May 2017