Call for proposals from companies and consortia interested in undertaking a study is to understand the operational implications of emerging SF6-free regulations and to evaluate available alternatives for high-voltage switchgear in the offshore wind sector. A key focus will be on understanding the regulatory and practical challenges associated with the parallel use of SF6-based and SF6-free technologies during the transition period, including the technical and logistical feasibility of retrofitting or replacing existing SF6 switchgear with SF6-free solutions in high-voltage operational offshore wind and transmission switchgear assets.

The main objectives of this work are to establish the key points below.

• Ensure regulatory compliance through the provision of market specific clarity on SF6 regulatory requirements.
• Provide insights into the real-world implications of transitioning to SF6-free GIS.
• Provide guidance on mixed fleet management strategies of SF6 and SF6-free GIS.
• Inform project development decisions in relation to future-proofing assets to align with expected regulations.

Clarification questions should be received by 28 October at 17:00 GMT and the answers to these questions will be posted below on 4 November 2025.

The closing date to receive tender submissions is 11 November 2025.

All clarification questions and tender submissions should be sent electronically, by their respective deadlines, james.inkpen@carbontrust.com and ciara.ritson-courtney@carbontrust.com.