Exclusive: Vireo Ventures backs Einklang as Europe's battery storage sector booms

Vireo Ventures has led a €2.2m pre-seed investment in Einklang amid booming demand for cheap renewable energy and batteries to control them.

Berlin-based Vireo was joined in the round by SI Ventures, Saxovent, Angel Invest, Heimatboost, and DNA Ventures.

Einklang – which translates to ‘harmony’ in English – is a budding startup founded last year by alumni from prominent battery storage company Voltfang.

"In energy tech, software and services are where Europe can have the edge," Lucas Jonas, CEO and co-founder of Einklang, tells Impact Loop via video call.

Optimising output

Einklang installs and operates on-site batteries to industrial SMEs (or Mittelstand companies in Germany) and uses smart software to decide when to store, use, or trade electricity so companies save on energy costs – purportedly up to 40%.

“We have a lot of hardware now put in place, but it’s pretty inefficient how it’s running. It’s not really grid-friendly. We need to digitalise grids and improve software that controls those assets.”

Renewable energy overtook fossil fuels in Europe for the first time in 2025, as the grid begins to rely increasingly on cheaper solar panels and wind turbines – technologies which are largely imported from China.

Not worried about China

“Right now, I’m not really afraid of Chinese dependency,” Jonas says. “China is subsidising our energy transition through cheap hardware. What we have to do is keep that hardware and the resources in Europe by recycling batteries, and also focus on creating really great software to get the most out of these systems.”

For Felix Krause, partner at Vireo Ventures, the bet on Einklang is part of a much bigger conviction around flexibility software.

"We’ve made three investments in this space because we believe flexibility optimisation is one of the biggest opportunities in European energy tech right now," he tells Impact Loop.

"SMEs aren’t installing solar and batteries to save the world – they’re doing it because it’s simply cheaper. Renewables are now the lowest-cost source of electricity."

There’s a big untapped opportunity right now, Krause argues, in companies that provide solutions from behind the electricity meter.

"It’s about orchestrating production, storage and consumption on site – avoiding load spikes that can account for up to a third of electricity costs," Krause explains.

The investor sees the cheap renewables combined with batteries and software maturing into "infrastructure-grade assets."