Rondo Energy and SCG Cleanergy Activate Southeast Asia’s First Industrial Heat Battery in Thailand

Rondo Energy and SCG Cleanergy, a clean-energy subsidiary of SCG, announced the start of operations of Southeast Asia’s first heat battery at SCG’s cement plant in Saraburi Province, Thailand. The milestone was marked with a ribbon-cutting ceremony at the site.

The 33 MWh Rondo Heat Battery is now providing 2.3 MWth of continuous steam, charged from both the grid and a nearby floating solar farm. The system delivers superheated steam to a turbine, generating 24-hour clean electricity for cement production. This is the first unit built on Rondo’s new modular platform, which supports capacities from 33 MWh up to more than 1 GWh through standardized brick-and-wire heating elements configurable for diverse industrial needs.

Built entirely in Thailand with extensive use of local suppliers, the project demonstrates how Rondo’s brick-based storage can be deployed rapidly and cost-effectively through regional supply chains. SCG Cleanergy is now developing additional Rondo-powered clean heat projects across Southeast Asia.

The system is also the only heat battery globally to drive a steam turbine by integrating with the cement plant’s heat recovery system, increasing turbine power output with superheated steam.

“Today we’re announcing three big steps in Rondo’s journey,” said Rondo CEO Eric Trusiewicz. “We’re launching our first unit that is part of our new modular sizing approach, our first heat battery in South-East Asia, and the only one worldwide delivering high-pressure steam used for electric power generation.” 

“Integrating the Rondo Heat Battery marks a turning point for Southeast Asian industry,” said Attapong Sathitmanothum, CEO of SCG Cleanergy, “because heat-intensive industries like textiles, chemicals, and food processing are growing rapidly here. SCG Cleanergy is bringing SCG’s strengths and new technologies to deliver low-cost clean energy to help our customers across the region decarbonize as they grow, in line with SCG’s vision of Inclusive Green Growth — driving the transformation of industries toward a low-carbon society in collaboration with all sectors, while strengthening business competitiveness to ensure the sustainable growth of businesses, communities, and the environment. This milestone also represents another important step toward achieving SCG’s Net Zero 2050 goal.”