Menu

Elenia Grid Modernisation with HEKA M

Secured a strategic long-term contract to deliver 100 units annually by developing a completely new design and achieving full IEC type-testing in record time.

Reference details:

Timeline: 

Strategic framework agreement signed in 2025, supporting Elenia’s long-term weatherproof grid programme running until 2036.

Client: 

Elenia (One of the largest utility companies in Finland)

Scope of work: 

Rapid engineering, manufacturing, and type-testing of a high-capacity, SF6-free sheet metal compact substation (HEKA M).

Technical Specification:

  • Model / CSS Name: HEKA M
  • Configuration: HEKA1VM1000-8
  • Power Capacity: Up to 1000 kVA
  • IAC: Up to 20 kA / 1s
  • Enclosure Class: K15
  • MV Switchgear: Up to 5 bays, completely SF6-free RMU

Challenge

Meeting Ambitious Scale-Up Targets with New Green Standards

As part of a long-term initiative to replace old overhead lines with weatherproof underground cables, Finland’s leading utility provider, Elenia, needed high-capacity (1000 kVA) compact substations.

However, modern environmental expectations demanded a strict shift to SF6-free medium-voltage equipment, which alters the standard layout and footprint. Elenia needed a certified, highly reliable partner capable of scaling up production rapidly to hit their ambitious rollout targets.

Solution

Brand-New M-Configuration and Fast-Track Type-Testing

Harju Elekter designed a brand-new M-configuration variant of our compact substation: the HEKA1VM1000-8. Our internal engineering teams collaborated seamlessly to design an optimised sheet metal enclosure that houses a large 1000 kVA transformer, a highly efficient integrated low-voltage solution, and up to 5 bays of eco-friendly, SF6-free RMU switchgear.

Recognising that time was critical to secure the partnership, we fast-tracked the development and successfully passed full, rigorous Internal Arc type-testing according to the IEC 62271-202 standard.

Result

100 Units Per Year and a Landmark Nordic Partnership

By proving our rapid engineering agility and technical compliance, Harju Elekter successfully signed a landmark agreement to supply 100 units per year to one of Finland’s premier utility players.

The newly certified HEKA M substations provide Elenia with a scalable, environmentally sustainable “plug-and-play” asset. This directly accelerates their goal of achieving a 90% weatherproof underground grid by 2036, significantly boosting our market reputation and cementing Harju Elekter as a top-tier infrastructure partner in the Nordic region.