Annex VI energy audit criteria under the EU Energy Efficiency Directive

Article 11 of the recast Energy Efficiency Directive links energy audits and energy management systems to enterprise energy consumption. Enterprises above the higher consumption threshold must implement a certified energy management system, while enterprises above the lower threshold that do not implement such a system must undergo an energy audit.

For those audits, Article 11 points back to Annex VI. Member States must establish transparent and non-discriminatory minimum audit criteria in accordance with Annex VI, and they must designate a competent authority or body to check that audit timelines are met and that Annex VI criteria are correctly applied.

Annex VI requires an audit to begin from evidence, not assumptions. The audit data must be up-to-date, measured, traceable operational data on energy consumption; for electricity, the audit must also use load profiles.

The audit must then review the energy-consumption profile of the relevant buildings or groups of buildings, industrial operations or installations, including transportation. The purpose is not only to describe consumption but to identify energy efficiency measures, renewable-energy opportunities, and the largest improvement opportunities.

A weak Annex VI audit usually fails before the recommendation stage because the data boundary is not traceable. The audit file should show where each consumption value came from, what period it covers, which meters, invoices, operational systems, or load-profile exports support it, and why the selected sites, operations, installations, or transport activity are representative.

Representativeness matters because Annex VI requires enough coverage to draw a reliable picture of overall energy performance and to identify the most significant improvement opportunities. Sampling can be practical, but the sample needs a reason: energy intensity, operating hours, process type, building use, climate or occupancy pattern, production line, fleet type, or another factor tied to the energy profile.

Annex VI says audits should build, whenever possible, on life-cycle cost analysis instead of simple payback periods. That changes the finance evidence: the audit should not stop at upfront cost divided by annual savings when long-term savings, residual value, or discount rates materially affect the choice.

The audit report should make the calculation trail visible. For each proposed measure, keep the baseline, proposed technical change, expected energy reduction, tariff or cost assumption, investment cost, operating-cost effect, lifetime or assessment period, residual-value assumption where relevant, discount-rate assumption where used, and sensitivity notes for uncertain inputs.

Article 11 requires enterprises covered by the audit obligation to draw up a concrete and feasible action plan based on the audit recommendations. The action plan must identify measures to implement each audit recommendation where technically or economically feasible, and it must be submitted to management.

That means the Annex VI audit report should be written so recommendations can move directly into an action plan. Each recommendation should have an owner, affected asset or process, evidence-backed baseline, proposed measure, calculated savings, feasibility conclusion, implementation status, and reason for any recommendation not implemented.