Call for entries from companies and consortia interested in undertaking a study for the OWA Electricals Technical Working Group (TWG-E) to develop a systematic framework for assessing and managing the stability risks arising from the sequential integration of heterogeneous GFM/GFL offshore wind farms into high-penetration clusters, enabling evidence-based grid code compliance and secure connection of new assets under weak grid conditions.

The main objectives of this work are to quantify cross-farm stability margins in offshore clusters comprising a mix of grid-forming (GFM) and grid-following (GFL) devices operating in parallel across a range of grid strength conditions, and to characterise the inter-plant control interactions that arise from heterogeneous OEM control philosophies and unknown tuning parameters. The work will identify adverse interaction envelopes (including oscillatory modes, reduced damping, and voltage instability) as neighbouring farms are added sequentially to a cluster. It will also define the data and interface requirements necessary from nearby connected users and the TSO to support modelling and grid code compliance, and identify and scope the studies needed to support the development and secure connection of new assets in high-GFM offshore clusters.

The deadline for clarification questions is 10 July 2026. When responses are finalised they will be found in the tender documents below.

The closing date to receive tender submissions is 27 July 2026 at 13:00 BST.

All tender submissions should be sent electronically, by their respective deadlines Jack.Borrett@carbontrust.com and James.Inkpen@carbontrust.com.