Connection charges overview
If you want to connect to the transmission system, there are a number of charges you’ll need to pay – initially for your application, and then ongoing charges, all of which are collected by the Electricity System Operator (ESO).
When you apply for a connection to the Electricity System Operator (ESO), there will be a charge for the application, depending on the size of your proposed scheme. The fees are set annually and published by the ESO.
We can also provide other pre-application services, such as a feasibility study. There may be a charge for these services, and a quote will always be provided before any work is carried out.
Ongoing connection charges
Once your assets are connected to the transmission system, you’ll need to pay ongoing charges that are collected by the ESO on our behalf.
A charge for new assets or reinforcements needed to connect you to the network.
This is paid to the Electricity System Operator for our costs for building and maintaining single-use assets which facilitate a user’s connection. This charge can either be paid in full upfront or via an annualised charge over the life-time of the asset(s). One-off charges may be applied for any ‘non-standard’ works requested by the customer.
Transmission network use of system (TNUoS) charge
This charge covers the cost of building and maintaining the national electricity transmission network, which all our customers benefit from using. The charge is based on your demand forecast and geographical tariffs are published annually. The Electricity System Operator also publishes quarterly forecasting information.
Balancing services use of system (BSUoS) charge
This covers the day-to-day costs of balancing generation and demand on a minute-by-minute basis. BSUoS is calculated daily as a flat tariff for all network users. The Electricity System Operator provides a forecast of BSUoS as part of the monthly balancing services summary report.
Both charges are billed monthly and will end if you terminate your contract with us.
Want to make an enquiry?
Find out how to get in touch with us if you have an enquiry about getting connected to the electricity transmission network or any aspect of the connections process. When you complete one of our enquiry forms, we’ll get back to you within the next business day.