Vensum Power has secured €9M in a Series A round to start mass production of its power converters in 2027. Power converters change electricity from one voltage to another, and some energy is lost as heat each time.
Lifeline Ventures, a venture firm in Helsinki, Finland, co-led the round with Indian engineering group Larsen & Toubro. Eviny Ventures, the venture arm of Norwegian energy company Eviny, was the third lead investor. The new money takes Vensum’s total funding to €15.2M.
Production will start with converters for electric vehicle charging, energy storage and small local grids that run on direct current, known as DC microgrids. After that, Vensum plans to move into AI data centres, where it aims to help operators make better use of the power capacity already in place.
Chief executive Peter Nisula described the round as the company’s move from developing its technology to producing it at industrial scale. “The question in data centres is no longer only how powerful the chips are, but how efficiently the used electricity actually reaches them,” Nisula said.
Converters Run By Software
To limit energy losses, Vensum says its converters use software to adjust how they work in real time as demand and incoming voltage change. “Thanks to the software-defined approach, our converters operate consistently at extremely high efficiency even with rapidly changing loads,” Nisula said.
The company’s website says its converters use soft switching, a method that turns the current on and off at moments when little energy is lost. Vensum says soft switching and high switching speeds together allow smaller, more powerful converters, and that a lean design with fewer parts produces less heat. The company adds that its tested hardware and software designs can be reused for new voltages and power levels, and that the converters can be updated and checked for faults remotely.
Vensum raised its seed round, its first outside funding, in 2023. At the time it said that cutting conversion losses from 7–10% to 3–5% would save more than half of the wasted energy. The company did not give efficiency figures in its latest funding announcement.
Backers And Data Centre Demand
Espoo-based Vensum was established in 2018 and is part of the Aalto Startup Center portfolio in Finland. Lifeline Ventures also led its €3.8M seed round in 2023, when Grid.vc, Harjavalta and Business Finland took part. The state funding agency provided a €1.7M loan and €400,000 in funding for research-heavy deep-tech companies.
Two of the new lead investors have their own stakes in energy and data centres. Larsen & Toubro is building data centres in India under its L&T Vyoma brand and has set aside ₹100 billion for the business, with plans for about 200 megawatts of capacity over time. Eviny Ventures is based in Bergen, Norway, and says it has invested more than NOK 280M in 20 companies that help speed up the shift to clean energy.
The move into data centres comes as they use more and more electricity. The International Energy Agency estimates that data centres used about 415 terawatt hours of electricity in 2024. The agency expects demand to more than double to around 945 terawatt hours by 2030, driven largely by AI.
Some governments are moving to tighten the rules. Thailand’s energy regulator is drafting stricter power terms for data centres, including higher electricity tariffs and deposits for connecting to the grid.
Data centre power systems are also changing shape. In May 2025, chipmaker NVIDIA set out plans to move AI data centres towards 800-volt direct current from 2027. Under that design, power from the grid would be converted once at the edge of the site rather than through several conversion steps inside it. NVIDIA says the change could improve end-to-end power efficiency by up to 5%.
Vensum argues that converters run by software can cut some of the energy lost each time electricity changes voltage. With the new funding, it plans to put those converters into mass production, starting with chargers and batteries and moving on to AI data centres later.
