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Offshore Wind. Geoff Sharples [email protected] Frequently Unanswered Questions. Why don’t “they” build more offshore wind? Why not make the blades bigger? How big will turbines get?. Offshore Resource is Good. The Market Drivers Converge. New offshore exceeds new onshore.

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Presentation Transcript
frequently unanswered questions
Frequently Unanswered Questions
  • Why don’t “they” build more offshore wind?
  • Why not make the blades bigger?
  • How big will turbines get?
the market drivers converge
The Market Drivers Converge

New offshore exceeds new

onshore

wind ventures further offshore
Wind ventures further offshore

To a shore based observer a 90m nacelle is below the horizon at 35 km

To a shore based observer a wind farm appears as white stripe at 20km

Interactive map at http://www.4coffshore.com/offshorewind/

Source: EWEA Oceans of Opportunity 2009

Confidential

power prices higher in coastal states
Power Prices Higher in Coastal States

Cape Wind PPA at 18 c/kWh

the cycle of non innovation
The cycle of non-innovation

Capital intensity curtails innovation

but

Offshore turbines today :

Modified onshore turbines

Confined to shallow water

Incumbents: understand the technical issues Have a vested interest in existing supply chains and facilities.

Human customers demand cheap reliable power

Project Financiers are risk averse

Offshore wind: Close to load

Far from view

Large Resource

Because

Developer tech risk averse

Because

Incumbents fund evolutionary design

Utilities are risk averse

Because

Entrepreneurs can’t fund revolutionary prototypes

cost of energy
Cost of energy

COE = (DR+IWF) x ICC + LRC + O&M

AEPnet

Where: COE = LevelizedCost of Energy ($/kWh) (constant dollars)

DR = Discount Rate (1/yr) = RISK Large Impact

IWF = Insurance, Warranty and Fees (1/yr)

ICC = Initial Installed Capital Cost ($) = TURCC+ BOSCC

TURCC = Turbine Capital Cost ($) Some Impact

BOSCC= Balance of System Capital Cost ($) Small? Impact

LRC = LevelizedReplacement/Overhaul Cost ($/yr) Med Impact

O&M = LevelizedO&M Cost ($/yr) Med Impact

AEPnet =Net Annual Energy Production (kWh/yr) Large Impact

physical constraints
Physical Constraints

Swept Area R^2

Mechanical conversion efficiency

Rotor Power Coefficient

conversion wind to mechanical

(subject to Betz limit)

air density

U = wind speed

design objectives
Design Objectives
  • Reduce Risk
  • Increase energy capture
  • Get to better resource
  • Reduce operations cost
  • Increase turbine capacity
design areas
Design Areas
  • Blades
  • Towers
  • Generators
frequently unanswered questions1
Frequently Unanswered Questions
  • Why don’t “they” build more offshore wind?
  • Why not make the blades bigger?
  • How big will turbines get?
slide18
FIN

Thank You

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