Uniper SE, a German energy supply company, and Blykalla AB, a Swedish producer of advanced small modular reactor (SMR) technology, have signed a deal to start work on building a test reactor near the coastal town of Oskarshamn, Sweden.

Founded in 2013 as a spin-out of the Royal Institute of Technology in Stockholm, Blykalla is developing and building SMR technology. Its SMR prototype SEALER-E features an electric lead-cooled reactor together with a combination of proven technology and proprietary materials.

The hope is that once built, this SMR will support Sweden’s efforts to produce clean and reliable baseload energy for a fossil fuel-free future.

In October 2024, Blykalla announced it had signed a deal with global engineering company ABB on the development of its SMR technology. This collaboration will initially focus on the construction of an electrical SMR pilot facility near Oskarshamn to test proof the SEALER-E prototype before expanding to future plants.

In a deal with Uniper, the...