Offshore wind farm decommissioning cost estimates. Simulating removal and transport of the subsystems of a hypothetical offshore wind farm site representative for the Dutch Roadmap 21GW
report
The Dutch Ministry of Climate and Green Growth (KGG) commissioned TNO to provide updated
cost estimates for the removal and transport of offshore wind farm subsystems. These
estimates are intended to inform revisions to the financial security provisions in future Wind
Farm Site Decisions (WFSDs) under the Dutch Roadmap 21GW. Additional context is provided
in Chapter 1.
This report summarizes the outcomes of high-fidelity simulations conducted with TNO’s
UWiSE Decommission software to estimate offshore wind farm decommissioning costs. The
simulations cover the removal and transport of wind turbine generators (WTGs), inter-array
cables (IACs), monopile foundations (MPs), secondary steel components, and scour protection
layers (SPLs), as well as associated pre- and post-decommissioning activities. Multiple
scenarios were analyzed, including a baseline case, variations in farm size and turbine rating,
port distance sensitivity, and activity duration uncertainty. Input assumptions reflect current
knowledge and price levels. Given the long-term horizon of these campaigns, the analysis also
considers emerging removal technologies that are not yet widely deployed but have been
validated in relevant environments and have credible development roadmaps aligned with
industry needs (e.g., large-scale vibro-removal and internal cutting of 8–10 m diameter
monopiles). Chapter 2 elaborates on the approach and assumptions used in this study, while
Chapter 3 presents the key simulation inputs.
cost estimates for the removal and transport of offshore wind farm subsystems. These
estimates are intended to inform revisions to the financial security provisions in future Wind
Farm Site Decisions (WFSDs) under the Dutch Roadmap 21GW. Additional context is provided
in Chapter 1.
This report summarizes the outcomes of high-fidelity simulations conducted with TNO’s
UWiSE Decommission software to estimate offshore wind farm decommissioning costs. The
simulations cover the removal and transport of wind turbine generators (WTGs), inter-array
cables (IACs), monopile foundations (MPs), secondary steel components, and scour protection
layers (SPLs), as well as associated pre- and post-decommissioning activities. Multiple
scenarios were analyzed, including a baseline case, variations in farm size and turbine rating,
port distance sensitivity, and activity duration uncertainty. Input assumptions reflect current
knowledge and price levels. Given the long-term horizon of these campaigns, the analysis also
considers emerging removal technologies that are not yet widely deployed but have been
validated in relevant environments and have credible development roadmaps aligned with
industry needs (e.g., large-scale vibro-removal and internal cutting of 8–10 m diameter
monopiles). Chapter 2 elaborates on the approach and assumptions used in this study, while
Chapter 3 presents the key simulation inputs.
Topics
TNO Identifier
1016329
Publisher
TNO
Collation
62 p.
Place of publication
Petten