Start with the facility and the investment decision
A useful energy audit connects how a facility operates with where it spends money on energy. Agree the buildings, utilities, operating hours and systems in scope before the site visit. An office assessment may focus on ventilation and central plant, while a manufacturing assessment must distinguish production demand from building services. The depth of investigation should match the decision: correcting schedules requires different evidence from replacing a major cooling system.
Build a baseline that explains the bills
Review a representative period of electricity and fuel consumption alongside tariffs, weather, occupancy and production. Interval data can reveal overnight demand and short-lived peaks that monthly totals conceal. In warehouses, throughput and shift patterns may explain changes; in offices, occupancy and outside temperature may be more important. Record missing data, meter boundaries and unusual operating periods so that apparent savings are not confused with a quieter business or milder weather.
Inspect the systems that create demand
Utility analysis should be tested against site evidence. Review HVAC, refrigeration, lighting, domestic hot water and controls, together with relevant process systems. Look for unnecessary run hours, leaking compressed air where present, poor insulation, simultaneous heating and cooling, and equipment operating away from its intended duty. Speak with operators: recurring overrides, comfort complaints and maintenance issues often explain why a system consumes more than expected.
Turn findings into an investment-ready opportunities register
Each recommendation should state the evidence, proposed intervention, estimated energy reduction, tariff basis, implementation cost and operational constraints. Separate low-cost operating changes from capital projects. Simple payback is a useful screen, but maintenance, equipment life, reliability and disruption also affect value. Assess interacting measures together: improved controls can reduce the load on replacement equipment, so adding independent savings estimates may overstate the combined benefit.
Verify savings and use the findings across a portfolio
Agree how each measure will be checked after implementation, including meter or trend data, comparison periods and adjustments for changing conditions. Track both energy consumption and costs; tariff changes can alter expenditure without changing efficiency. Across multi-site properties, compare facilities with similar uses rather than ranking raw bills alone. A completed audit should leave the owner with clear priorities, accountable next steps and a method for confirming results—not a guaranteed savings percentage.
Reference & further reading
Official technical resource. Confirm applicability to your facility and engagement.
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