Energy efficiency obligations for businesses: who must audit, what to report and how to save

Energy efficiency obligations for businesses rarely arrive as one clear law. A regulator asks whether you have done your energy audit, a large customer whether you run an energy management system, your landlord who pays for the new heat pump. Each question rests on a different rule, and the rules differ by country, by site and by how much energy you use.

The work behind them is nearly always the same: measure what you use, find the measures that pay back, carry them out and show the result. Treated as a savings project rather than paperwork, an obligation tends to pay for itself.

What kinds of energy efficiency obligations exist?

Take away the national names and you find three types of duty, used alone or combined.

Buildings add their own rules, such as energy certificates when you sell or let. This page deals with the business that uses the energy.

Who has to do an energy audit under the EU Energy Efficiency Directive?

The recast EU Energy Efficiency Directive changed the test from company size to energy use. An enterprise whose average annual consumption over the previous three years exceeds 10 TJ (about 2.8 million kWh) needs an energy audit, and above 85 TJ (about 23.6 million kWh) it must run an energy management system certified by an independent body (source: European Commission, July 2024).

The audit is repeated at least every four years. The enterprise turns its recommendations into an action plan, and the plan and how much of it has been carried out are made public, for example in the annual report (source: European Commission, July 2024). An in-house auditor may do the work if that person is not directly involved in the activity being audited.

Energy audit rules compared: EU, UK, US, Canada and Australia

The table gives the principle in each market; thresholds and deadlines are on the linked official pages.

Check your own country:

• Which law: a national version of the EU directive, a scheme such as ESOS, a measure duty, or only building rules.
• What counts: per company, group or site, and whether vehicle fuel and own solar power are included.
• Who may audit: registered auditors only, or also qualified in-house staff.
• What follows: a report, an action plan, required measures or progress updates, and by which deadline.

These rules change often: treat any overview, this one included, as a starting point.

What does an energy audit report contain, and what do you report?

A useful audit report reads like an investment proposal. It starts from a baseline of energy use per site, carrier and main use, taken from metered data rather than annual bills. The directive points auditors to standards such as EN 16247-1 for the method (source: EUR-Lex, September 2023). Look for:

• Significant uses: the few installations behind most consumption, such as cooling, compressed air or ovens.
• Measures with figures: investment, yearly saving in energy and money, payback or net present value, useful life and overlap between measures.
• Assumptions: energy prices, operating hours and discount rate, so you can rerun the sums when prices move.

What goes to the authorities depends on the scheme: a notification of compliance in the UK, a portal report in the Netherlands, a public action plan under the EU rules. Keep the full report and its data for inspectors and your next auditor.

How do you turn an energy audit into savings?

Payback is quick to explain; net present value is fairer to long-lived equipment. Know which one your national rule uses.

1. 01

   Check the baseline

   Compare the audit's figures with your own meter data. A wrong baseline makes every saving wrong.

2. 02

   Do the no-cost measures this month

   Settings, schedules, leaks and switching off at night need an owner, not a budget.

3. 03

   Rank investments in money

   Sort by payback and net present value, and mark the measures your national rule makes mandatory.

4. 04

   Line up the financing

   Allowances and grants often need an application before you order; see funding for sustainability.

5. 05

   Give each measure an owner and a date

   Put the plan in the budget and the maintenance calendar.

6. 06

   Measure the result

   Compare consumption before and after, corrected for production and weather.

Example: from audit report to savings plan at a food producer

Harbourline Foods makes chilled meals at two sites and spends €410,000 a year on energy. Operations manager Ines Hallberg ranks the five measures from its audit.

Fictitious Firmfocus example. Savings assume current energy prices and operating hours. The logic works in any currency.

The first four measures cut the bill by €61,000, about 15% of €410,000, and would all pass a five-year payback test. The heat pump fails it. At a 6% discount rate, €31,000 a year is worth €228,163 over ten years, half its 20-year life: €31,837 short of the investment. Over the full 20 years it is worth €355,568, or €95,568 more than it costs. A 25% grant of €65,000 brings the investment to €195,000, the payback to 6.3 years and the half-life value to plus €33,163. Ines schedules it for the boiler's replacement date and applies for the grant before ordering.

Small site or energy-intensive business: what changes?

Common pitfalls with energy efficiency obligations

• Assuming one threshold fits all: the EU tests energy use per enterprise, the Netherlands per location, the UK the size of the group.
• Treating the report as the result: regulators now ask what you did with it.
• Judging everything on payback: heat pumps and insulation look poor on payback and good on net present value.
• No split with the landlord: agree in the lease who carries out and pays for which measure.
• Planning on proposals: announced changes to thresholds or payback periods only count once they are law.

Energy obligations are one of the rules covered under sustainable business. If you generate your own power, read solar, batteries and grid congestion next; for running costs in general, see reducing business costs.