Energy Consumption Calculator

Annual kWh by asset is the unit of work for every meaningful energy review: ESOS Phase 4 submissions, SECR baselines, refurbishment business cases, supplier tenders. The calculation is simple in isolation and brittle at scale, because diversity factors, operating schedules and seasonality all sit between the nameplate watt rating and the actual half-hourly profile. A spreadsheet that gets the headline numbers wrong by 10% can quietly invalidate the whole report.

For a multi-site mid-market business, the asset audit is usually the longest line item in the energy strategy. Five hundred items across thirty sites at fifteen minutes each is forty days of work, and at the end of it the team has a baseline that the FD has to defend in a budget meeting. Building the baseline against measured HH data, not just asset-level estimates, is the way to make it stick.

Purely Energy uses Purely Insights to reconcile asset-level estimates against measured half-hourly consumption per site, so the variance between bottom-up and top-down models is visible from day one and traceable to specific meters. For ESOS, SECR and B-Corp recertification work that lands on the same finance team in the same quarter, the saved hours, the consistent methodology and the audit-trail confidence are usually worth more than the bill savings on their own, even though both compound.