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Watt a palaver

Lletters

I read with interest your news article on the Windsor Castle hydropower plans (NCE last week), but could not make the numbers stack up.

To my mind, the description of the installation as '200kW' defines the maximum power output. If water head and river flow volumes allowed 100% availability at this rating, then I would expect the yearly output to be 200kWh x 24 hours/day x 365 days/year = 1,752 MWh.

The article claims that 12,000MW/h to 13,000MW/h (presumably MWh) a year will be provided, perhaps implying high velocity flows and much more that the 200kW power stated!

Approaching it from a different angle, an electrical output of 12,000 MWh per year at a revenue of say 8p per kWh gives a revenue of £960,000 per year. The capital cost is stated as only £850,000.

What a bargain.

Malcolm Goodwin (M), mgoodwin@absconsulting. com Editor's note: Apologies for the confusion. According to Npower, the scheme's promoter, the turbines will generate around 1.2-1.3M units (KWh) of electricity a year.

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