Amsterdam’s Moonwatt raises €8M to revolutionise solar energy storage

Funding for sodium-ion battery tech

Amsterdam-based Moonwatt has raised €8 million to scale up its sodium-ion battery technology, designed to make solar energy more reliable and cost-effective. The funding round was co-led by daphni and LEA Partners, with participation from Founders Future, AFI Ventures, Kima Ventures, and strategic investors.

Moonwatt is developing the world’s first energy storage system built specifically for solar power. Unlike conventional lithium-ion batteries, its sodium-ion technology is cheaper, safer, and 1,000 times more abundant, making it an ideal solution for large-scale renewable energy storage. By co-locating storage with solar plants, Moonwatt aims to increase solar capacity factors from 15-20% to up to 80%, reducing reliance on the grid and stabilising energy prices.

Founded in 2024 by former Tesla Energy executives Zukui Hu, Guillaume Mancini, and Valentin Rota, the company is tackling one of the biggest bottlenecks in renewable energy: scalable storage. With solar power growing faster than any other energy source, the industry faces major challenges like grid congestion, price cannibalisation, and energy waste. Moonwatt’s solution could unlock solar’s full potential, helping to cut emissions and accelerate the clean energy transition.

Fresh local funding

The fresh funding will support technology development, team expansion, and global deployment. As Amsterdam strengthens its position as a climate tech hub, Moonwatt’s innovation could play a key role in reshaping the future of renewable energy.

Amsterdam is a thriving hub for sustainability-focused startups, tackling everything from plastic-free products to energy transition solutions. Many are now scaling up, securing funding to accelerate their impact.

Moonwatt joins other Amsterdam-based companies in funding news, like Smyle who recently raised over €1 million through share funding to expand its plastic-free, vegan toothpaste tablets. Monumental another Amsterdam local, which automates construction with robotics and software, secured $25 million to grow its engineering team. With more forward-thinking businesses choosing Amsterdam, the city is emerging as a leader in sustainable innovation shaping the future across multiple sectors.

Discover more about Amsterdam’s innovation landscape