We’ve published a discussion paper on TNUoS charging; backing calls from our customers to review and reform the current transmission charging methodology to support decarbonisation at the scale and pace required for net zero. The paper, which is supported by Scottish Renewables and independently verified by Baringa, outlines SSEN Transmission’s findings on TNUoS charging in the north of Scotland, based on stakeholder feedback and evidence from operational schemes.

Our generation customers and wider stakeholders in the north of Scotland consistently tell us that charges for transmission access, as well as uncertainty about future charges, are acting as a blocker to the commercial viability of renewable energy projects. This in turn creates uncertainty for us in terms of efficient system planning for the network, whilst also impacting on the energy markets where generators seek to earn revenue.

Evidence shows us that TNUoS charges are indeed many, many times higher in the north of Scotland than elsewhere in GB. The charges for a single generator can also swing dramatically from year to year and this is near impossible to predict or plan for commercially. It’s important to note however that the issue of volatility and unpredictability is not unique to the north of Scotland but experienced by all generators regardless of technology or location. 

The UK and Scottish Government has put in place a number of ambitious policies to encourage and support greater deployment of renewable energy to meet our emission reduction targets. With Scotland’s contribution to the UK’s net zero targets in mind, we’re questioning if the current transmission charging regime (which was initially devised 30 years ago) is still fit for purpose in a net zero world, effectively penalising renewable generators in the areas with the greatest resource. Using the paper as a catalyst, we’re keen to explore options for reform based on feedback from our stakeholders. 

If you would like to share feedback, or arrange a call to discuss our paper in further detail please contact: Andrew.Urquhart@sse.com.

TNUoS Charging Papers

TNUoS Charging Paper - February 2021
File Type: pdf
Published: 15 Feb 2021
TNUoS Charging Stakeholder Feedback Paper - May 2021
File Type: pdf
Published: 10 May 2021