Decision on 2025-26 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors

Decision on 2025-26 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors | Ofgem Please enable JavaScript in your web browser to get the best experience. BETA This site is currently in BETA. Help us improve by giving us your feedback . Close alert: Decision on 2025-26 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors Publication type: Decision Publication date: 27 March 2025 Topic: Offshore electricity transmission, Electricity interconnectors Print this page Related links Decision on 2024-25 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors and modification to inflation metrics Share the page Share on Facebook Share on Twitter Share on LinkedIn This republished letter sets out our decision on the specific Interest During Construction (IDC) rates that will apply to those offshore transmission (OFTO) projects and electricity interconnectors granted the cap and floor regime that reach Final Investment Decision (FID) during 2025-26. OFTO projects – to set the IDC rate capped at 9.74 % (pre-tax, nominal) for projects reaching FID in 2025-26 (9.48% in 2024-25). Window 3 interconnectors – to set the IDC rate at 5.37 % (vanilla, real-CPIH) for projects reaching FID in 2025-26 (5.38% in 2024-25). Main document Decision on Interest During Construction rates to be applied during 2025-26 to offshore transmission projects and electricity interconnectors granted the cap and floor regime [PDF, 236.95KB] Print this page Related links Decision on 2024-25 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors and modification to inflation metrics Share the page Share on Facebook Share on Twitter Share on LinkedIn Close