Koncar D&ST, a subsidiary of Croatian electrical company Koncar, has delivered and commissioned a transformer for the Ørsted Kalundborg CO₂ Hub, a key carbon capture and storage (CCS) project in Denmark led by Ørsted.

The transformer, a three-phase, dual-winding unit with an on-load tap changer, was installed at the Avedore power plant substation in early March 2025. With a capacity of 50 MVA and voltage rating of 10.5 kV, it features an ester-based insulating fluid that is biodegradable and lowers environmental risks in the case of leaks or failures.

The transformer supports the Kalundborg CO₂ Hub, which plans to capture and store up to 430,000 tonnes of CO₂ annually starting in 2026. This is equivalent to the yearly emissions from about 200,000 petrol-powered cars.

During the initial phase, before a CO₂ pipeline is completed across Zealand, captured emissions will be transported by truck to the Asnæs power plant. The site will act as a temporary onshore terminal for liquefied CO₂, which will later be shipped and stored in geological formations under the North Sea.

A second transformer, rated at 40 MVA and also using Midel 7131, is scheduled for delivery in November 2025 as part of the same project.