Energy benchmarking

Energy-use benchmarking is an energy-management tool that enables us to identify poorly performing buildings and operations, advise on strategic investment in energy-efficient upgrades, and track the effectiveness of environmental improvements.

Through benchmarking, the key metrics for assessing the performance of a building (or portfolio of buildings) can be identified, along with the drivers of energy demand.

We construct the most apposite benchmarks for our clients, depending on industry sector, facility type and available data. These might include NPIs and SERs:

Normalised performance indicator (NPI) – kWh of energy per square metre of treated floor area (TFA)

Data permitting, this is calculated according to the operational rating on the building’s Display Energy Certificate (DEC), introduced in the UK to comply with the EU’s Energy Performance of Buildings Directive.

Specific energy ratios (SER) – kWh per unit of output

The performance of industrial processes is sometimes measured as specific energy ratios (SER), kWh per unit of output. These are useful when employee numbers and building space remain constant, but increased productivity drives up energy demand.

NPI per employee – kWh per square metre of TFA per employee

For year-on-year comparisons, it is useful to calculate energy consumption per square metre of office space per employee, to ensure true efficiency comparisons.

Normalised weather performance indicator (NWPI) – kWh per square metre of TFA per employee per degree days

This smooths out the effect of changes in outside air temperature on the demand for power so that year-on-year comparisons (or month-on-month comparisons) can be made.

Topics: Benchmarking, EMS implementation, Energy, Energy management, William Richardson

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