In case you havent heard, were on the edge of an energy crisis in the UK. It may not be common knowledge yet, but the National Grid has to work harder than ever before to balance supply and demand. And demand is increasing faster than supply. However, if you are the proud owner of a diesel or gas-powered standby generator that you use to provide backup power for your business, the UK energy crisis might be an opportunity for you. In order to balance supply and demand, the National Grid has a few options. The way that it balances real-time demand for power is by varying the supply frequency. Youll probably remember from your physic lessons at school that power is directly proportional to frequency (P = f x C x V2 where f is frequency, C is capacitance and V is voltage). If demand for power is greater than generation, the frequency falls, while if generation is greater than demand, the frequency rises. You can see how the real-time demand varies with frequency on the National Grids website. National Grid has a licence obligation to control frequency within the limits specified in the 'Electricity Supply Regulations', i.e. ±1% of nominal system frequency (50.00Hz) except in abnormal or exceptional circumstances. National Grid must therefore ensure that sufficient generation and/or demand is held in automatic readiness to manage all credible circumstances that might result in frequency variations.