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

Content:
Decision
Publication date:
Topic:
Offshore electricity transmission
  • ➞ OFTO tender rounds
Electricity interconnectors
Industry sector:
Offshore Transmission Network,
Transmission Network

Related links

Decision on 2024-25 Interest During Construction rates for offshore transmission projects and cap and floor interconnectors and modification to inflation metrics

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]