Finnish technology company Steady Energy will build a small nuclear reactor (SMR) plant
pilot facility in central Helsinki, located at the decommissioned Salmisaari coal power
station. The pilot plant will demonstrate the maturity and safety of Steady Energy’s small
modular reactor (SMR) technology.
Espoo – Finnish SMR developer Steady Energy Ltd will begin construction of its test facility in central
Helsinki. The chosen site is the turbine hall of the Salmisaari B coal power plant, owned by energy
company Helen Ltd. Steady Energy and Helen have signed a lease agreement for the site, running until
2028. Construction is set to start in late 2025, with a budget of €15 to €20 million, funded by capital
investments already raised by Steady Energy.
The test facility equipment is a full-scale model of the LDR-50 reactor module. However, the pilot plant
differs from the actual LDR-50 unit as it will not contain nuclear fuel in its reactor core. Instead, water
within the reactor loop will be heated by electrical resistance elements providing approximately one-tenth
of the LDR-50 reactor’s actual power output. Steady Energy’s facility will fit entirely within the turbine hall
and will not affect the external appearance of the building. Commercial reactors will eventually be built
underground, similarly leaving the cityscape largely unaffected.
This will be the first instance of physically testing a reactor module at full scale, beyond simulation
environments, before actual construction. “We minimise cost and time risks by testing the plant
thoroughly before selling it. Private investors see this approach as a major reason to trust us,” says
Tommi Nyman, CEO of Steady Energy. “Our objective is market-based small nuclear energy that can be
built without subsidies,” Nyman adds.
“The primary objective of the pilot facility is to demonstrate that the core passive safety system of the
LDR-50 functions effectively at full scale,” says Antti Teräsvirta, Steady Energy’s project manager for the
pilot facility.
“It’s fantastic that the pilot facility will be situated at Salmisaari, precisely where coal usage recently
ceased,” comments Olli Sirkka, CEO of Helen Ltd. “As landlords, we can closely follow the facility’s
development and, as a bonus, gain about six megawatts of additional emission-free capacity to our grid.”
Helen Ltd ended coal usage in energy production earlier this spring with the closure of the Salmisaari
coal power plant, reducing Helsinki’s carbon emissions by approximately 30 percent. The company aims
to achieve carbon neutrality by 2030 and entirely combustion-free energy production by 2040.