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Floater Sizing Tool
OWOE Advanced Sizing Tool
Input
Energy TypeWind
System TypeFloating Foundation
SubtypeSemi (3-column)
LocationUSA - California
Hs (design)29.8 ft
Water Depth2,950.0 ft
Turbine Power Rating8.0 MW
Number of Platforms96
Distance to Shore33.0 nm
Type Substation
Number of Substations0
Start Over Update Input Save Scenario
Scenarios Saved: 0 /


Output
Platforms:
Payload1,067 st
Hull Displacement8,375 st
Turbine:
Hub Height340.1 ft
Rotor Diameter476.2 ft
Turbine Base Diameter26.7 ft
Platform Cost (avg)$75.9 million
 
Substations:
Type Substation
 
Wind Farm:
Total Power768.0 MW
Number of rows8
Number of columns12
Row spacing (8D)3,809 ft
Col spacing (6D)2,857 ft
Transmission System
 
Platform Cost (total)$7.29 billion
Substation Cost (total)$0.00 billion
Trans Sys Cost (total)$0.87 billion
Wind Farm Cost (total)$8.16 billion
 
Project Duration211.2 months

Duration = start of FEED through end of installation

Platform Hull Dimensions
Column c/c Span173.5 ft
Column Diameter37.5 ft
Column Height105.8 ft
Pontoon Length136.0 ft
Pontoon Diameter13.1 ft
 
Draft62.6 ft
Freeboard43.3 ft
 
# Mooring Lines3


These dimensions and costs are based on a very limited number of floating wind facilities, all of which are prototypes or demonstration facilities at this time. Results should only be used as best estimates at this time. Do not sanction or build a platform using this data.


For help in sizing a platform to meet your unique requirements, please contact:

www.vloffshore.com
(713) 766-6765


If you like OWOE's platform sizing tool, you can access advanced sizing features by becoming a registered OWOE user. Click here to login or register in order to access advanced features such as weight and cost breakdowns, execution strategies, and project schedules:
Login / Register


Platform Execution Strategy (International)
Activity Type or Location
Platform Fabrication Location Korea
Platform Fabrication Type land skidways
Platform Loadout Type loadout to barge
Platform Tow Preparation float-off barge / float-on transport vessel
Platform Ocean Transport dry transport to offshore site (5,200 nm)
Platform Offload Type float-off transport vessel
Turbine Installation offshore lift
Mooring Fabrication Location Gulf of Mexico
Payload, Weight and Capital Cost (CAPEX) Breakdown
Component Payload (st) Weight (st) Avg Cost Each ($m) Cost Total ($m)
Development 0.8 81.4
Engineering 2.0 187.3
Turbine 1,067 1,067 11.8 1,129.1
Hull 4,192 19.3 1,850.1
Mooring (incl transportation) 28.7 2,753.1
Transportation (platform) 1.6 152.8
Installation (incl turbine) 4.1 397.6
Offshore HUC 0.6 58.2
Financing (platforms) 7.1 680.6
Wind Platform Total 1,067 5,259 75.9 7,290.3
MVAC Intrafield Cables 0.0
Cables to Shore 0.0
Onshore Equipment 0.0
Financing (transmission system) 0.0
Transmission System Total 868.1
Wind Farm Total 8,158.4
1) To the extent possible, costs are aligned with NREL guidance (2015).
2) Individual platform costs are for the average cost of a fleet of 96 wind platforms and use
learning curve improvements for all platform components.
3) Development costs include permitting, front-end engineering, and infrastructure
improvements (ports and staging).
4) Installation costs assume a single mobilization of a class 2 vessel and no vessel idle time;
therefore, platform delivery must be optimized to avoid significant idle time and associated cost.
5) Finance costs include insurance, decommissioning fund, loan origination fee, and capitalized
interest based notionally on a loan with a 10-year term, 50% debt-to-value, 4.5% interest, and 5%
fees. The impact of other loan assumptions can be examined via the LCoE evaluation.
6) Transmission system finance costs include all components, including substations.
7) Costs exclude contingency, corporate overhead and profit.
Execution Schedule Summary
Milestone / Activity Start (months) Duration (months) End (months) Activity Display
Project Start 0.0

Pre-FEED 0.0 12.0 12.0

FEED 12.0 9.0 21.0

 
 
 
 
 
 
 
 
 
 
 
 

Issue Bid 21.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Bid, Solicit, Award 21.0 6.0 27.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Project Sanction 26.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Award Contracts 27.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Detailed Engineering 21.0 12.0 33.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Topsides Equipment and Turbine Procurement (1st platform) 27.0 12.0 39.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Fabrication (1st platform) 27.0 9.6 36.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Loadout (1st platform) 36.6 0.9 39.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Sailaway 39.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Transportation (1st platform) 39.0 1.3 40.3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Mooring System Procurement (1st platform) 27.0 14.8 41.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Mooring System Installation (1st platform) 41.8 0.1 41.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Installation (1st platform, incl turbine) 41.9 0.2 42.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Stormsafe 42.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Offshore Hook-up and Commissioning (1st platform) 42.1 0.6 42.7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Commercial Operation Date (Ready to Energize 1st platform) 42.7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Topsides Equipment and Turbine Procurement (remainder) 39.0 11.0 50.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Fabrication (remainder) 36.6 171.9 208.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Loadout and Transportation (remainder) 40.3 170.4 210.7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Mooring System Procurement (remainder) 41.8 43.8 85.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Platform Installation (remainder - mooring, platform, turbines) 42.1 168.7 210.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Offshore Hook-up and Commissioning (remainder) 42.7 168.5 211.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Ready to Energize last platform 211.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Schedule Notes:
1) This schedule is indicative of the platform execution schedule based on current industry norms; actual durations will depend
on project specifics
2) Execution schedule durations are based on fabrication of a fleet of 96 wind platforms and use learning curve improvements
for all construction and installation activities
3) Pre-FEED activities include site surveys, permitting, preliminary feasibility and engineering studies, environmental studies
and stakeholder engagement
4) The following represent opportunities to optimize the schedule as currently shown:
- Improve or expedite platform delivery - up to 147.4 months
- Improve or expedite mooring system delivery and installation - up to 1.6 months


Comparison of OWOE Parametric Sizing Algorithms to Actual Platforms - Floating Wind
(values represent ratio of sizing algorithm to platform actuals - color indicates quality of the comparison: green best (+-5%) -> yellow (+-10%) -> orange (+-15%) -> purple (+-25%) -> red worst (>25%), blanks no data)
 
    Platform Displacement   Column Dimension   Span   Draft   Hull Wt
Development Name   Using Actual Displacement Using Specified Payloads Using Advanced Relationships Using Simple Relationships   Using Actual Displacement Using Specified Payloads Using Advanced Relationships Using Simple Relationships   Using Actual Displacement Using Specified Payloads Using Advanced Relationships Using Simple Relationships   Using Actual Displacement Using Specified Payloads Using Advanced Relationships Using Simple Relationships   Using Actual Displacement Using Specified Payloads Using Advanced Relationships Using Simple Relationships
WindFloat - 2 mw prototype   1.00 1.00   1.00 1.00   1.00 1.00   1.00 1.00  
WindFloat - 6 mw production   1.00 1.00   1.01 1.01   0.98 0.98   0.98 0.98  
Hywind - 2.3 mw prototype   1.00 1.00   1.24 1.24     0.66 0.66  
Hywind - 6 mw production   1.00 1.00   0.95 0.95     1.08 1.08  
VLO Y-Wind 3 mw   1.00 1.00   0.99 0.98   1.06 1.06   1.02 1.02  
VLO Y-Wind 5 mw   1.00 0.95   1.01 0.99   0.95 0.93   0.99 0.97  
VLO Y-Wind 8 mw   1.00 1.01   1.01 1.01   1.00 1.00   0.99 0.99  
Average   1.00 0.99   1.03 1.02   1.00 0.99   0.96 0.96  
Standard Deviation   0.00 0.02   0.09 0.10   0.04 0.05   0.14 0.14  


Key Dimensions Diagram
173.5 ft
37.5 ft
62.6 ft
13.1 ft
105.8 ft
340.1 ft
476.2 ft