PGE selected to lead SJV2024 grid compliance and substation protection for OX2's 125 MW Kannisto BESS — a 400 kV-connected storage at Kannisto wind farm
Power Grid Engineers has been selected by Enersense to deliver project management and consultation services covering the full SJV2024 grid compliance process and substation protection settings for a battery energy storage in Finland, connected to the 400 kV transmission grid.
Power Grid Engineers PGE has been selected by Enersense as the project management and consultation partner for the battery energy storage system (BESS) at OX2’s Kannisto wind farm in Halsua, Ostrobothnia. The 125 MW / 250 MWh facility is one of the largest energy storage facilities in the Nordics, connected to the 400 kV transmission network.
PGE's scope in the project
PGE will provide project management and consultation services across the full grid compliance lifecycle, and protection engineering for the new substation infrastructure. Grid connection studies include grid connection testing and document handling for the grid connection process, in accordance with Fingrid’s (the Finnish Transmission System Operator, TSO) SJV2024 grid code. Our scope covers:
- SJV2024 Phase 0: leading the SJV process kick-off with Fingrid and a preliminary reactive power capability check.
- SJV2024 Phase 1: reactive power capability studies and project-specific PSS®E and PSCAD simulation models tuned to fulfil Type D BESS requirements.
- SJV2024 Phase 2: leading the SJV2024 grid compliance tests and validating the PSS®E and PSCAD models against on-site measurements.
- Substation protection settings: protection settings for the new 400 kV bay and 33 kV switchgear, including transformer protection and tap changer control.
"OX2's Kannisto BESS project is important for us, and we wanted a partner with strong hands-on experience in power systems and compliance with grid connection requirements. PGE’s expertise in understanding, modeling, and validating Fingrid’s SJV2024 requirements gives us confidence in the project's successful completion." — Eero Törmä, Head of Substation Engineering, Enersense
BESS connected at 400 kV
Until now, battery storage projects in Finland have mostly been connected at the distribution or 110 kV sub-transmission level. The Kannisto BESS will be connected at 400 kV, the highest voltage level of the Finnish main grid. Connecting a battery storage system at this level requires advanced engineering capability across grid code compliance, dynamic studies, and high-voltage protection design, and demands close coordination with Fingrid throughout the SJV process.
A milestone for Finland's energy transition. As wind and solar generation grow, the role of large-scale storage in balancing the system becomes critical. The Kannisto BESS demonstrates how renewables and storage can be co-located and connected directly to the high-voltage transmission grid.
About the project
The BESS will be built at a dedicated station near the Kannisto 400 kV substation. The storage area will comprise around 50 six-metre battery containers and 16 larger bus-sized units, together delivering 125 MW of power and 250 MWh of capacity.
The energy storage facilities represent OX2’s first energy storage additions to its Finnish IPP portfolio.
Enersense will be responsible for the full delivery of the energy storage project, from site preparation to battery system installation and final grid connection.
"At Enersense, we are involved in a wide range of investment projects for both substations and BESS systems, and our strong maintenance organization is responsible for the long-term operation of these systems. That is why it is particularly important to us that the systems are technically functional and reliable from the start. We have known PGE’s experts for a long time, so we trust that even the most demanding projects will be delivered in a well-managed and high-quality way.”— Eero Törmä, Head of Substation Engineering, Enersense
Built on PGE's grid expertise
Power Grid Engineers specialises in the engineering that high-voltage projects depend on: PSS®E and PSCAD simulation modeling for SJV2024 compliance, dynamic and subsynchronous studies, substation protection settings, and the project management discipline that keeps complex grid connections on schedule. It is a combination of capabilities that few teams in the Nordics offer under one roof, and we are proud to bring it to a project that sets a new benchmark for renewable-integrated storage.
Read more at Enersense and OX2 websites:
Enersense wins its first large-scale Battery Energy Storage project in Finland – Enersense
OX2:n ensimmäiset energiavarastoinvestoinnit Suomessa Kanniston ja Korkeamaan tuulipuistojen yhteyteen – OX2
For more information, please contact:
Power Grid Engineers PGE Oy
Petri Koski
Principal Consultant, Power System Protection
Mobile: +358 50 341 6341
Email: petri.koski@pge.fi
Jouni Mälkönen
Chief Executive Officer
Phone: + 358 40 726 9087
Email: jouni.malkonen@pge.fi
