This page helps understand what an Energy Efficiency Directive energy audit must contain under Annex VI.
The focus is audit quality: measured and traceable energy data, representative scope, life-cycle cost analysis, validated savings calculations, and usable audit outputs.
Structured answer sets in this page tree.
Cited legal and guidance references.
Annex VI of Directive (EU) 2023/1791 is the quality floor for energy audits, including audits carried out inside energy management systems. It does not read like a long audit manual. It sets the minimum conditions an audit needs to satisfy before the findings can be trusted: current measured data, a detailed energy-consumption profile, identified efficiency and renewable-energy opportunities, where possible, representative coverage, validated savings calculations, and storable data for later performance tracking.
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 to identify energy efficiency measures, renewable-energy opportunities, and the largest improvement opportunities.
Annex VI sets minimum criteria, not a prescribed report layout or an auditor credential. Member State rules can add qualification, quality-control, submission, or template requirements, so the audit file must record both the Annex VI cross-check and the applicable national process.
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. Annex VI does not set one EU-wide coverage percentage or sampling formula. Commission Recommendation (EU) 2024/2002 describes possible Member State de minimis, clustering, and sampling approaches, including similar-site samples, but those examples are non-binding guidance. The applicable national scheme decides whether a minimum percentage, sample size, or specific method applies.
Where sampling is allowed, 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. Keep the cluster characteristics, omitted population, selected sample, and representativeness rationale in the report.
Annex VI says audits should build, whenever possible, on 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.
Use Sorena to connect Article 11 scope, Annex VI audit criteria, audit data, calculations, management action plans, and implementation evidence.
"Energy audits General requirements"
"Selection of clusters, sampling methodology"
"life-cycle cost analysis instead of simple payback periods"
"draw up a concrete and feasible Action Plan"
"Energy management systems and energy audits"
"minimum criteria for energy audits"