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Simply put, energy efficiency means using less energy to get the same job done - and in the process, cutting energy bills and reducing pollution. Declines in energy intensity are a proxy for efficiency improvements, provided a) energy intensity is represented at an appropriate level of disaggregation to provide meaningful interpretation, and b) other explanatory and behavioral factors are isolated and accounted for.

Typically these two technologies are used separately (or only placing them in parallel) to produce hot water 133 In this system the solar solar energy pros and cons article thermal panel performs the function of the low temperature heat source and the heat produced is used to feed the heat pump's evaporator.

In essence, the UK energy market will either see the energy price cap temporarily suspended so that energy suppliers can recover, which would mean that consumers end up paying the cost, or the energy price cap remains in place and energy suppliers that cannot survive the competition go bust.

Similarly, investing in energy efficiency is almost always cheaper and cleaner for utilities than new generation resources—or even the fuel costs of existing generation—but such investments lead to reduced earnings potential under the traditional utility business model.