In the recent April Operational Forum, National Grid revealed that substantial “constraint” payments were made to a number of Scottish wind farms in the first week of April1. A constraint occurs when the grid system or a section of the system is unable to absorb all the electricity being generated, and some generators that are contracted to generate must be asked to stand down.
The April event occurred because the Scottish grid network could not absorb all the energy being generated, and chose to constrain wind power off the system, paying very high prices to compensate wind generators for the lost income, in some cases as high as 20 times the value of the electricity which would otherwise have been generated. In total approximately £890,000 pounds was paid over a few hours to six wind farms, these costs being ultimately destined to pass on to the consumer.
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