The balance of energy supply and demand is something that most of us not only take for granted, but don't even consider. Generally speaking, individuals and businesses have sufficient electricity and gas to satisfy their requirements and are only seldom frustrated by outages. This symbiotic relationship of supply and demand is managed by the National Grid on a second-by-second basis and is usually relatively easy to predict. However there are times that unexpected events can result in demand being greater than forecast and so the Grid carries a 'reserve' of electrical energy for such eventualities.
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