Planning an EnMS implementation based on ISO 50001
Domain 3 tests the energy review as a data-driven process and the chain running from review to EnPI, baseline, objectives and action plans (clause 6).
Clause 6 sequence
6.1 risks and opportunities; 6.2 objectives and energy targets with action plans; 6.3 energy review; 6.4 EnPIs; 6.5 energy baseline; 6.6 planning for collection of energy data. The standard prints 6.2 before 6.3, but in practice objectives must be informed by the review.
The energy review (6.3)
Analyse energy use and consumption from measurements and other data, covering current energy sources and past and present consumption; identify SEUs; for each SEU determine relevant variables, current energy performance and estimated future use; identify and prioritize opportunities for improvement. The review is repeated at defined intervals and after significant changes.
Objectives and action plans (6.2)
Objectives and targets are measurable where practicable, consistent with the policy, and take into account SEUs, relevant variables, legal and other requirements and best practice. Action plans state what will be done, resources, responsibility, timeframe and how results will be evaluated.
EnPI and baseline (6.4, 6.5)
The method for determining and updating each EnPI is documented; EnPIs are reviewed against the baseline at defined intervals. The baseline derives from energy review data and is adjusted for significant changes in static factors.
Worked example
A boiler house burns 40 TJ of gas per year for 25 000 t of steam; outdoor temperature and steam output are relevant variables. The EnPI is GJ gas per tonne of steam, the baseline is a 12-month normalized regression, and the target is a 3% reduction in that ratio - not a 3% cut in total gas, which would simply follow production.
Traps
An objective of 'reduce kWh' with no denominator; an EnPI the existing meters cannot measure; a baseline never adjusted after a new line; an energy review performed once for the auditor.