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London Array - getting there.

 
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biffvernon



Joined: 24 Nov 2005
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Location: Lincolnshire

PostPosted: Mon Dec 17, 2012 10:49 pm    Post subject: London Array - getting there. Reply with quote

http://www.businessgreen.com/bg/news/2231951/worlds-largest-offshore-wind-farm-slots-in-final-turbine

The 175th turbine has just gone in. 630MW installed capacity cost £2 billion, so that's about £3 per Watt. With a load factor of about a third that's going to be about £10 per actual generated Watt. How does that compare?
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Little John



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PostPosted: Mon Dec 17, 2012 11:08 pm    Post subject: Re: London Array - getting there. Reply with quote

biffvernon wrote:
http://www.businessgreen.com/bg/news/2231951/worlds-largest-offshore-wind-farm-slots-in-final-turbine

The 175th turbine has just gone in. 630MW installed capacity cost £2 billion, so that's about £3 per Watt. With a load factor of about a third that's going to be about £10 per actual generated Watt. How does that compare?
What does 630Mw represent? Is that the amount of power generated per annum? How long will it last? How much will it cost to maintain? How much will it cost to dismantle at the end of its life? Only when all of those factors, as well as the initial build price, are taken into account can an actual cost per watt be calculated. Unless I've misunderstood. In which case, please explain.
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biffvernon



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PostPosted: Mon Dec 17, 2012 11:17 pm    Post subject: Re: London Array - getting there. Reply with quote

stevecook172001 wrote:
What does 630Mw represent? Is that the amount of power generated per annum?[/quote]

No, that would be xMWhr. MW is a rate of electricity production. I think the standard way to rate these things is to give the maximum possible generation rate when the wind is at the ideal speed and everything is hunky-dory. Expect about a third of that averaged over a lengthy period of real time, so maybe a little over 200MW. That would give getting on for 2 million MWhrs per year.

(Better check my arithmetic before you go quoting this.)
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PS_RalphW



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PostPosted: Tue Dec 18, 2012 11:40 am    Post subject: Reply with quote

If we ignore operating costs and assume a 25 lifetime for the turbines
(for the sake of simplicity) then we get

630 Mw (max power) X 0.3 (average load factor ) X 25 X 365 X 24 =

41,391 GWh for £2B = £0.05 per KWh

Add another 5p for operating cost s and 5p for financing and it still looks like a price worth paying.
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biffvernon



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PostPosted: Tue Dec 18, 2012 12:17 pm    Post subject: Reply with quote

Which is why I keep saying that no new nuclear power station will be built in the UK. Follow the money.
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adam2
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PostPosted: Mon Jan 21, 2013 1:04 pm    Post subject: Reply with quote

And remember that when the wind turbines reach end of life, that they are relatively easy to dismantle with many components that can be recycled.
Acces roads and electrical infrastructure should last longer than the wind turbines and can be re used to serve replacement wind turbines.
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Blue Peter



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PostPosted: Mon Jan 21, 2013 1:48 pm    Post subject: Reply with quote

RalphW wrote:
If we ignore operating costs and assume a 25 lifetime for the turbines
(for the sake of simplicity) then we get

630 Mw (max power) X 0.3 (average load factor ) X 25 X 365 X 24 =

41,391 GWh for £2B = £0.05 per KWh

Add another 5p for operating cost s and 5p for financing and it still looks like a price worth paying.


However, Alistair Buchanan, in the CIBSE lecture seems to be saying that wind wasn't living up to it's billing, which I presume is in terms of the average load factor being considerably less than 0.3. I've meant to ask why this was going on, but have forgotten, but this seems as good a time as any,


Peter.
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RenewableCandy



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PostPosted: Mon Jan 21, 2013 11:00 pm    Post subject: Reply with quote

All sorts of teething troubles. Interestingly the REF (who are a lobby group for Biofuels, and have taken it upon themselves to bash wind) have a database of measured capacity factors for wind farms...and the said database demonstrates that the capacity factors have been rising over the recent years.

For offshore, 30% is wel realistic and not an over-statement at all.
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