ISO 50001 and ETJ+ both meet the energy management obligation once the system is certified, so the choice is settled by something other than legal acceptance: ETJ+ suits a company that takes part in the voluntary energy efficiency agreement in Finland or can join it, and ISO 50001 suits a company that wants to handle both energy obligations with a single system and drop the separate statutory audit. The obligation arises when the average annual final energy consumption over the three previous calendar years exceeds 23,600 MWh, and the certified system must be in place by 11 October 2027 at the latest.
When is a certified energy management system mandatory?
The obligation is settled by consumption. A company’s financial size no longer affects whether it falls within the scope of the Finnish Energy Efficiency Act; after the amendments that entered into force on 1 January 2026 the obligation has two steps: a company consuming over 2,700 MWh a year carries out a company energy audit, and a company consuming over 23,600 MWh a year adopts a certified energy management system. The threshold is compared with the average annual final energy consumption over the three previous calendar years. If the company has operated for less than three years, the missing years are counted as zero.
Both obligations stem from the Energy Efficiency Directive (EU) 2023/1791, which each member state implements nationally. ETJ+, by contrast, builds on the voluntary energy efficiency agreements concluded with a state authority in Finland, and the Finnish Energy Efficiency Act does not extend to sites outside Finland.
Final consumption is calculated per company and covers all energy types, but not everything counts. Fuels for international maritime transport, ambient energy, deliveries to the transformation and energy sectors, and transmission, distribution and power plant losses are left out. For heat pumps, their electricity consumption counts, not the heat collected from air, water or the ground. Energy from side streams, sawdust and bark for example, is the company’s own consumption. The practical difference is large: at a sawmill burning its own sawdust for heat, that energy raises final consumption, while the heat a ground source heat pump draws from the surroundings does not.
The provisions on energy management systems sit in chapter 1 c of the Finnish Energy Efficiency Act. An overrun of the consumption threshold must also be reported to the Finnish Energy Authority: the duty arises when consumption exceeds 2,700 or 23,600 megawatt-hours in a calendar year (sections 6 and 3 g of the Energy Efficiency Act).
How is the three-year average calculated?
The final consumption figures for the three previous calendar years are added together and the total is divided by three, and sites belonging to the same company go into the same total. The example company has three sites in Finland. Its own consumption figures, given as the example’s input data, are 21,400 MWh for 2023, 24,900 MWh for 2024 and, for 2025, 12,300, 8,200 and 4,600 MWh by site. Final consumption for 2025 is therefore 12,300 + 8,200 + 4,600 = 25,100 MWh.
The three-year total is 21,400 + 24,900 + 25,100 = 71,400 MWh. The average is 71,400 / 3 = 23,800 MWh, which exceeds the threshold of 23,600 MWh. The example company therefore has the energy management obligation, and its certified system must be in place by 11 October 2027 at the latest.
Close to the threshold, a single year decides. Had the same company consumed 18,000 MWh in 2023, the total would be 68,000 MWh and the average 68,000 / 3 = 22,666.7 MWh. The average would then exceed the 2,700 MWh threshold but not the 23,600 MWh one, and the obligation would be a company energy audit, which a company falling within scope for the first time must complete by 11 October 2026.
Ownership relations are not added together. The example company’s sister company, consuming 9,000 MWh a year, is assessed as a company of its own and lands on the audit side. The obligations can still be handled at group level, in which case all group operations go into the system or the audit, including companies consuming under 2,700 MWh a year. Fulfilment at group level does not in itself create an energy management obligation unless the group contains a company consuming over 23,600 MWh a year. Go through the boundaries of the calculation before choosing a route, and check your own position with the calculator.
What separates ISO 50001 from ETJ+?
From the act’s point of view the difference is small: the systems accepted as meeting the obligation include at least a certified ISO 50001 and a certified ETJ+, and the list is not exhaustive. The differences come from what the system is tied to and what it replaces.
| ISO 50001 | ETJ+ | |
|---|---|---|
| What it is | An energy management system that can be certified. | A Finnish energy efficiency system tied to the voluntary energy efficiency agreements concluded with a state authority in Finland. |
| Energy management obligation (over 23,600 MWh/year) | Met once the system is certified. | Met once the system is certified. |
| Audit obligation (over 2,700 MWh/year) | Met when certified, and no audit under the act is then carried out. | Met without certification for a company in the energy efficiency agreement, and no audit is then carried out. |
| Coverage | 90 per cent of the company’s energy use is enough for certification. | The same 90 per cent coverage applies to certification. |
| Who the route suits | A company that wants to handle both obligations with one system. | A company in the energy efficiency agreement or able to join during the 2026-2035 period. |
The example company is already in the energy efficiency agreement, so ETJ+ is the shorter route: annual consumption monitoring already exists as part of the agreement work. Once consumption exceeds the 23,600 MWh threshold, certification is nonetheless mandatory on this route too. An uncertified ETJ+ is enough only for the audit obligation, and that requires the energy efficiency agreement. The 2026-2035 agreement period can be joined at any point during the period, so the route stays open to a company not yet taking part.
Where do the costs of the choice come from?
The price tag sits in three factors rather than in the name of the standard. The first is certification: the price of the audit is agreed directly with the certification body and is not part of consultancy work. The second is scope. Coverage of 90 per cent of energy use is enough, but the certificate exempts only the functions within it: at 60 per cent coverage the audit obligation still applies to the remaining 40 per cent, so the company maintains two parallel procedures instead of one. At the example company 95 per cent of energy use sits in two production plants, so limiting the certificate to those covers the obligation with a single system.
The third factor is upkeep. A company with a certified ISO 50001 does not need a named person in charge of the company energy audit, and site audit data is not submitted to the Finnish Energy Authority, so the four-year audit cycle falls away. In the ISO 14001 plus statutory audit combination the company energy audit is carried out at least every four years, and the key data from site audits goes to the register within three months of the site audit report being completed. In the combination of ISO 14001, the energy efficiency agreement and ETJ+, no statutory company energy audit is carried out at all. The certificate is not submitted on the company’s own initiative but within a month, and only when the authority asks for it.
Neglect carries a price of its own. The Finnish Energy Authority supervises compliance, and under section 30 a of the Energy Efficiency Act the audit reports and other information needed for supervision must be submitted to the Authority within one month of its request. Under section 31, the Authority may order a party neglecting the Act to fulfil its obligation and reinforce its decision with a conditional fine or with a threat of enforced performance or suspension under the Act on Conditional Fines (1113/1990). The consumption monitoring the system requires also produces data that reveals other savings targets, such as demand charge optimisation.
Can the obligation be met without a new system?
Yes, through two combinations and one contract type. Under the Finnish Energy Authority’s interpretation, a company is exempt from the statutory energy management system if it holds a certified ISO 14001 together with a company energy audit carried out to the minimum requirements of the act, and likewise if it holds a certified ISO 14001 together with the energy efficiency agreement and ETJ+. On the audit side there are more accepted routes: a certified ISO 50001, a certified ETJ+, a certified ISO 14001 together with ETJ+, and the energy efficiency agreement together with ETJ+. An environmental permit does not exempt a company from the audit obligation.
The third route is an energy performance contract, that is, an EPC or ESCO contract. It exempts a company from both the energy management system and the audit to the extent that final energy consumption falls within the scope of the contract; as regards the audit obligation this is laid down in section 7(3) of the Finnish Energy Efficiency Act. The contract must include the four elements of an energy management system referred to in section 3(31): actual monitoring of consumption, measures implemented to improve energy efficiency, measurement of progress, and compliance with Annex XV to Directive (EU) 2023/1791. The service provider’s remuneration must also be tied to the improvement in energy efficiency or to another energy efficiency criterion, and the share of guaranteed savings must be greater than 0 per cent.
The boundary is what matters here. If the example company’s EPC contract covers the heating of two properties, that is, 15 per cent of final consumption, the exemption applies to that part alone and the remaining 85 per cent needs a route of its own.
How is the choice made?
The order is in practice always the same:
- Calculate the average of the three previous calendar years with the right boundaries and see which threshold it exceeds.
- Map what already exists: a certified ISO 14001, the energy efficiency agreement, ETJ+ or an energy performance contract. The existing system settles the choice more often than the differences between standards.
- Set the coverage of the certification so that no obligation is left outside it, and for a group check whether one ISO 50001 certification covering at least 90 per cent of the group’s energy use is enough.
- Fix the deadlines: the certified system in place by 11 October 2027 at the latest, and a first company energy audit by 11 October 2026 at the latest for a newly obligated company.
At the example company the order was settled at step 2: the energy efficiency agreement was already in force, so certifying ETJ+ calls for less new work than adopting ISO 50001.
We at Iiva sell neither equipment nor electricity, so our route recommendation does not depend on what the company buys afterwards. Our experts work out the consumption threshold from your own figures and tell you which route calls for the least new upkeep.
We start from the three-year average and a review of the systems already in place. Read about our energy management system service or check with the calculator which obligation applies to your company.