Wednesday, February 11, 2009
More windfarm power per unit area
The windfarm with the highest load factor in the British Isles has a power per unit area of 6.5 W per square metre.
Commentors on my previous article on
the power per unit area of windfarms queried whether any cherry-picking might have happened
in the selection of Blood Hill windfarm; it was also suggested that we should work out the numbers for Burradale, the famous windfarm in Shetland with the highest load factor in Britain. The answer to the first query is "no, not at all" - Blood Hill was selected at random, and as I said, I would encourage anyone who can be bothered to look up the data for other windfarms to do so and add the results to the "withouthotair" wiki.
And now, to satisfy the request for cherry-picked facts about wind in the UK, I am happy to present...
The data: Burradale has five wind turbines: three in "phase 1" and two in "phase 2". Their capacities are 660 kW and 850 kW respectively, and their average outputs over the last few years have been 357 kW and 446 kW respectively. (That corresponds to load factors of 52% and 54%.) I judged the "area occupied" by the five turbines to be 0.3 square kilometres. The average power per unit area of this windfarm is 6.5 W per square metre.
This number can be compared with my assumed figure of 2 W per square metre for typical onshore windfarms in the UK.
So, a cracking good place for wind, Shetland! What does it need? Obviously what this place really needs is a campaign group opposed to expanding wind farms in Shetland. And The Good Lord hath provided "Sustainable Shetland".