Small embedded generation
Small generators wishing to connect to the distribution network, that do not require explicit access rights to the NETS, will make all agreements with the DNO. However, if the DNO believes the proposed small power station may have an impact on the NETS, they may contact us.
Following this, we will assess whether there is a need to reinforce the transmission network as a result of the new distribution connection, and this is called a statement of works (SOW). The Small Embedded Generation and National Grid guidance document provides small generators and other interested parties with an understanding of National Grid’s involvement in distribution connections, and what a new generator can expect from the SOW process.
Large embedded generation
Large generation customers who are applying to connect to the distribution network are also required to have a connection offer with National Grid. Large generators are categorised as the following:
100 MW or greater in National Grid’s transmission network;
30 MW or greater in Scottish Power’s transmission network; and
10 MW or greater in Scottish Hydro Electric’s transmission network.
The two options for this type of customer are Bilateral Embedded Generation Agreement (BEGA) and Bilateral Embedded Licence Exemptible Large Power Station Agreement (BELLA).
The BEGA states how generators will be required to comply with the:
The BEGA will also provide the customer with transmission entry capacity (TEC) as the customer will have the right to operate in the electricity balancing market and export onto the NETS.
To apply, BEGA customers will be required to:
The BELLA states how generators will be required to comply with the:
The user does not have to adhere to the Balancing and Settlement Code (BSC) because a BELLA does not automatically give the customer rights to operate in the electricity balancing market and export onto the NETS. However, it is possible for a BELLA user to actively participate in the balancing mechanism without TEC, provided the user installs the necessary hardware (EDL, EDT and control telephony). To do this, a user must request to vary the BELLA to include the relevant technical appendices. Once this is complete, the normal compliance process is followed to make sure that the relevant equipment has been installed.
To apply, BELLA customers will be required to: