Forth Estuary
Forum
28th Nov 2013
The Seagreen Project in the Firth of Forth Round 3 Zone
Nick Brockie, SSE Renewables
Seagreen Offshore Project Manager
Seagreen Wind Energy Limited
SSE Renewables and Fluor Ltd joint venture (partners on Greater
Gabbard OWF development)
For development, construction and operation of offshore wind
farm projects in the Firth of Forth Round 3 Zone
Contractual Zone Development Agreement with The Crown Estate
Target generation capacity 3,500MW, up to 7 offshore wind farms.
The Crown Estate development partner, sharing some
development costs.
SSE Renewables
Offshore Wind
Part of SSE plc - approximately 11,500MW electricity generation
capacity
Over 3,000MW Renewables capacity (hydro, onshore wind,
offshore wind)
Operational offshore wind farms
– Greater Gabbard 500MW (with RWE)
– Walney 1&2 370MW (with Dong)
Also 4,400MW coal fired; 4,500MW gas and oil fired capacity
SSE Renewables
Offshore Wind
Significant investment in development of offshore wind capacity by
SSE Renewables, with a range of partners
Galloper OWF (consented May 2013) - up to 500MW
Beatrice OWF (Moray Firth) - up to 1,000MW
Firth of Forth R3 Zone (Seagreen) - up to 3,500MW
Islay OWF - up to 750MW
Dogger Bank R3 Zone (Forewind) - up to 9,000MW
Hunterston – National Offshore Wind Turbine Test Facility
SSE Renewables
Offshore Wind
Beatrice
Firth of Forth Zone
Islay
Hunterston
Dogger Bank Zone
Walney 1&2
Greater Gabbard,
Galloper
SSE Renewables
Offshore Wind
National Offshore Wind Turbine
Test Facility at Hunterston
Offshore Wind Turbines
Siemens NG6
Rotor - 154m
Hub height - 100m
No Gearbox – direct drive
6.0 MW (2 x 3.0MW Generators)
Mitsubishi Sea Angel
Rotor - 167m
Hub height - 110m
Hydraulic drive
7.0 MW (2 x 3.5MW synchronous
generators)
Firth of Forth Zone - Seagreen Phase 1 Offshore Project
Zone area 2,850km2
23km min to 80km offshore
Water depth 35m to 70m
3 Development Phases
Phase 1 (offshore application
Oct 2012)
–
400km2 total area
–
Up to 150 WTGs
–
1,050MW max capacity
–
Export cable landfall
Carnoustie
Firth of Forth Zone – Seagreen Phase 1 Offshore Project
Firth of Forth Zone – Seagreen Phase 1 Onshore Project
Landfall at Carnoustie
19km underground cable
New substation at Tealing
Planning consent achieved
November 2013!
HVAC
HVDC
HOW TO BUILD AN OFFSHORE WIND FARM?
Key Components
Met mast(s)
Offshore substation
Wind turbine generators
Export cables (offshore and onshore)
Array cables
Onshore substation
Firth of Forth Zone – Seagreen Phase 1 Offshore Project
Indicative wind farm layouts
(150 WTGs)
Offshore Wind Farm Design – Foundations and Substructures
Monopile
Multileg (jacket)
Gravity base
Suction pile
Foundation and Substructure Design Considerations
Water depths
Ground conditions
Construction / logistics
Installation method
Environmental impact
Cost!!!
Offshore Substations
Collection point for array cables
Steps up voltage
Export back to onshore substation
HVDC or HVDC
OSP
AC 500MW
DC 1GW
Length (m)
45
86
Breadth (m)
45
50
Height (m)
40
55
Weight (te)
2,500
16,000
Offshore Wind Farm Construction
Port facilities
– lay down and load out
Installation vessels
– Jack-up, transport barge, cable
lay, ROV support, guard, floating
heavy lift, personnel transfer
vessel.. etc
Capacities and Operability
Cable Installation
Array cables and Export cables
Buried in the seabed - ploughing or jetting
Cable Protection – rock dump or concrete
mattress
Offshore Wind Farm Operation and Maintenance
25 year working life
Monitoring and service
Preventative and corrective
maintenance
Minimise downtime and lost
revenue
O&M Vessels
–
–
–
–
–
Crew transfer vessels (helicopters?)
Heavy lift
Survey / ROV
Offshore service vessels?
Floating accomodation?
Firth of Forth Round 3 Zone - Phase 1 Offshore Project
Project Alpha visualisation – Braes of Lunan