NZS 20086:2022 introduces new concepts, metrics and methods that greatly enhance the ability of stakeholders to measure or calculate, holistic energy performance and thus operational carbon emissions. Standard covers three methods for the assessment of the energy required for electric lighting within a building, either by calculation (method 1 and method 2) or by direct metering of the lighting circuit (method 3). The calculation method 1 offers two options: 1) for new or refurbished buildings; and 2) for existing buildings. For new and refurbished buildings - it also offers a quick calculation method 2 for the annual energy estimation. The inclusion of refurbished building applications is particularly relevant to NZ conditions.