Floater Sizing Tool

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Floater Sizing Tool

OWOE Advanced Sizing Tool

Input

Energy Type	Wind
System Type	Floating Foundation
Subtype	Semi (3-column)
Location	USA - North Pacific
Hs (design)	32.8 ft
Water Depth	1,427.0 ft
Turbine Power Rating	8.0 MW
Number of Platforms	3
Distance to Shore	16.2 nm
Type Substation
Number of Substations	0

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Output

Platforms:
Payload	1,067 st
Hull Displacement	8,375 st
Turbine:
Hub Height	340.1 ft
Rotor Diameter	476.2 ft
Turbine Base Diameter	26.7 ft
Platform Cost (avg)	$81.6 million

Substations:
Type Substation

Wind Farm:
Total Power	24.0 MW
Number of rows	1
Number of columns	3
Row spacing (8D)	3,809 ft
Col spacing (6D)	2,857 ft
Transmission System

Platform Cost (total)	$244.9 million
Substation Cost (total)	$0.0 million
Trans Sys Cost (total)	$41.7 million
Wind Farm Cost (total)	$286.6 million

Project Duration	43.8 months

Duration = start of FEED through end of installation

Platform Hull Dimensions

Column c/c Span	173.5 ft
Column Diameter	37.5 ft
Column Height	109.7 ft
Pontoon Length	136.0 ft
Pontoon Diameter	13.1 ft

Draft	62.6 ft
Freeboard	47.1 ft

# Mooring Lines	3

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

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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:

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 (4,700 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	2.5
Engineering			4.0	12.0
Turbine	1,067	1,067	14.7	44.0
Hull		4,255	27.6	82.8
Mooring (incl transportation)			11.5	34.4
Transportation (platform)			1.5	4.4
Installation (incl turbine)			13.3	39.9
Offshore HUC			0.9	2.6
Financing (platforms)			7.4	22.3
Wind Platform Total	1,067	5,322	81.6	244.9
MVAC Intrafield Cables				0.0
Cables to Shore				0.0
Onshore Equipment				0.0
Financing (transmission system)				0.0
Transmission System Total				41.7
Wind Farm Total				286.6

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 3 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	1.2	40.2
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	0.5	39.5
Platform Fabrication (remainder)	36.6	4.2	40.8
Platform Loadout and Transportation (remainder)	40.2	2.8	42.9
Mooring System Procurement (remainder)	41.8	0.9	42.7
Platform Installation (remainder - mooring, platform, turbines)	42.1	1.1	43.2
Offshore Hook-up and Commissioning (remainder)	42.7	1.1	43.8
Ready to Energize last platform	43.8			∇

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 3 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 0.5 months

- Improve or expedite mooring system delivery and installation - up to 1.7 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