With this in mind, here are our top tips for measuring your consumption:
Qualifying organisations must calculate total energy consumption over a reference period of 12 consecutive months. This data must be new and the reference period must include the qualification date of 31 December 2018 and end before the compliance date of 5 December 2019. (If an organisation is unable to collect energy data for the full 12-month period, then it should collect data from as close to 12 months as is reasonably practicable and explain why it has had to do so in its ESOS evidence pack.)
ESOS does include options to make compliance easier in this regard, an organisation could use the average day rate of energy use for one month to estimate the energy used for another month, and extrapolate that data. Or, it could use the annual energy use of one site to estimate how much energy another site is using, particularly if that site is a similar size, age, and build. An auditor should carry out at least one site visit as part of an organisation’s ESOS Phase 2 energy audit. Regulators will look for well-reasoned and documented justifications for the approach that the Lead Assessor took (for example, they will want to know why certain conclusions from site visits might be applicable to any other sites covered in a particular sample).