Success Story
Nordsee Delta: proving 2.1 TWh of offshore output to three lenders at once
Three lenders, one offshore wind farm and no agreed production figure. Nacelle-level evidence committed to a shared ledger let Nordsee Delta prove 2.1 TWh of output to all of them at once.
CLIENT
Nordsee Delta
LOCATION
German North Sea
CAPACITY
690 MW offshore wind
DELIVERED
2025
Results
RESULT 01
2.1 TWh
Annual output proven to three lenders from a single record.
RESULT 02
3
Lenders reading the same ledger during a €900m refinancing.
RESULT 03
99.8%
Interval completeness over a North Sea winter, with store-and-forward backhaul.
The story
From the field to the ledger
SOLUTION USED
Wind Portfolio
Calibrated hardware in the field, a signed ledger behind it, and one record every party reads from.
The challenge
Nordsee Delta was refinancing a 690 MW offshore farm with three lenders, each with its own technical adviser and its own production estimate. A single month of disputed output had already delayed the process once, and a second delay would have cost the sponsor its rate lock.
Offshore is where estimates hurt most: the wind resource is variable, access is expensive and the SCADA record had gaps every winter.
What we did
Zephyra fitted all 74 turbines with nacelle units rated for the platform environment, paired with the farm’s met-mast and satellite atmospheric data. Readings were signed at source and buffered locally, so a dropped backhaul link never became a missing interval — interval completeness over the following winter was 99.8%.
All three lenders and their advisers were given access to the same ledger, with availability, curtailment and wake losses attributed per turbine.
The outcome
The refinancing closed on schedule with 2.1 TWh of annual output accepted by every lender from a single record — no side letters, no reconciliation between advisers. The same ledger now underpins the farm’s PPA settlement and its annual regulatory filing.
“
“Offshore is where estimates hurt most — a single disputed month can stall a refinancing. Zephyra gave us nacelle-level evidence every lender accepted without a side letter.”
Marit Boeckmann
Head of Asset Management, Nordsee Delta