Alfa Laval unveils compact once-through steam generator to advance renewable heat storage technology

Alfa Laval once through steam generator

(IN BRIEF) Alfa Laval has launched a new once-through steam generator designed for molten salt energy storage systems, integrating economizer, evaporator, superheater, and steam drum functions into a compact, all-in-one unit. The system enables efficient steam generation in small-scale power-to-heat applications, helping industries decarbonize by using renewable energy instead of fossil fuels. With reliable operation down to 5% load, the generator offers high performance, minimal footprint, and long-term durability thanks to its spiral-wound design. Gregory Derderian of Alfa Laval highlighted its role in supporting the viability of renewable heat storage by combining efficiency, flexibility, and robustness in one system.

(PRESS RELEASE) LUND, 3-Nov-2025 — /EuropaWire/ — Alfa Laval, a global leader in heat transfer and energy efficiency solutions, has unveiled its new once-through steam generator (OTSG) — an advanced system engineered specifically for compact molten salt energy storage applications. The innovation merges the roles of an economizer, evaporator, superheater, and steam drum into a single, fully integrated shell, offering exceptional thermal performance, high reliability, and a reduced installation footprint.

The new steam generator is designed to meet the growing demand for modular power-to-heat systems, which enable industrial plants to decarbonize by replacing fossil fuels with renewable heat derived from solar and wind energy. In such systems, excess renewable electricity is used to generate heat stored in molten salt, which is later converted into steam for industrial processes. This approach helps cut CO₂ emissions while maintaining process efficiency and flexibility.

Alfa Laval’s OTSG system supports small-scale, locally installed power-to-heat setups that require minimal capital investment and limited installation time. Its highly compact design allows it to fit into confined spaces while ensuring efficient and stable steam generation — even when operating at just 5% load.

“Efficient, compact steam generation is essential for the viability of small-scale power-to-heat storage,” said Gregory Derderian, Energy Storage Business Developer at Alfa Laval. “Our once-through steam generators deliver an all-in-one solution that offers excellent thermal efficiency and outstanding reliability under cyclic conditions. The spiral-wound design enhances heat transfer while accommodating thermal expansion, which significantly reduces mechanical stress and prolongs equipment life.”

A key feature of the OTSG is its integrated water separation and recirculation system, which ensures smooth and stable performance at low loads. This design minimizes hold-up volume, allowing for faster system response and improved operational flexibility — key advantages in renewable and hybrid energy storage applications.

By enabling efficient steam generation in molten salt-based energy storage systems, Alfa Laval’s new technology supports industrial decarbonization and the transition to sustainable energy. It combines proven thermal expertise with innovative engineering to help industries maximize renewable energy utilization without compromising reliability or efficiency.

For more details about Alfa Laval’s once-through steam generators, visit www.alfalaval.com/once-through-steam-generator.

For further information, please contact:

Anne Baymont
Product Portfolio Manager
E-mail: anne.baymont@alfalaval.com

Editor’s notes

This is Alfa Laval 

The ability to make the most of what we have is more important than ever. Together with our customers, we’re innovating the industries that society depends on and creating lasting positive impact. We’re set on helping billions of people to get the energy, food, and clean water they need. And, at the same time, we’re decarbonizing the marine fleet that’s the backbone of global trade.

We pioneer technologies and solutions that free our customers to unlock the true potential of resources. As our customers’ businesses grow stronger, the goal of a truly sustainable world edges closer. The company is committed to optimizing processes, creating responsible growth, and driving progress to support customers in achieving their business goals and sustainability targets. Together, we’re pioneering positive impact.

Alfa Laval was founded 140 years ago, has customers in 100 countries, employs more than 22,300 people, and annual sales were SEK 66.6 billion (5.8 BEUR) in 2024. The company is listed on Nasdaq Stockholm.

www.alfalaval.com

SOURCE: Alfa Laval