Southwest Research Institute Debuts Zero-Emission Joule Hive Thermal Battery for High-Temperature Industrial Decarbonization

Southwest Research Institute debuts the Joule Hive Thermal Battery, a 20MWh electric system designed to decarbonize steel and cement industries.

By: AXL Media

Published: Mar 30, 2026, 10:18 AM EDT

Source: Information for this report was sourced from Southwest Research Institute

A Breakout Solution for Hard-to-Abate Heavy Industry

The traditional reliance on fossil fuel combustion for industrial heat, a primary driver of global carbon dioxide emissions, faces a formidable new competitor in San Antonio. Southwest Research Institute has unveiled the first full-scale Joule Hive Thermal Battery, a system specifically engineered to bridge the gap between renewable electricity and high-density thermal requirements. According to Josh Schmitt, a lead project researcher at SwRI, the technology offers a purely electric pathway for sectors such as chemical manufacturing and steel production that previously struggled to decarbonize due to the extreme temperatures required for their core processes.

Modified Firebrick Architecture as Thermal Storage

At the heart of this innovation is a sophisticated application of resistive heating utilizing specialized firebricks. These bricks, traditionally found in kilns and stoves, have been enhanced with conductive materials that allow electricity to flow through them at high voltages. As the current passes through, it generates intense resistive heat which is then absorbed and stored within the brick structure. This design allows for a critical decoupling of energy intake and heat delivery, enabling industrial plants to "charge" the system when renewable energy is most abundant and discharge it on demand.

Seamless Integration with the Electrical Grid

The system's technical infrastructure is built to handle significant power loads, featuring a direct 13.2 kV medium voltage integration. SwRI recently expanded its laboratory facilities to include a 12,000 square-foot outdoor slab and 600 amps of electric power specifically to host this 20 megawatt-hour unit. Dr. Tim Allison, director of SwRI’s Machinery Department, noted that this strategic investment has successfully established the capability to deploy zero-carbon heat at the megawatt scale. By integrating directly with existing utility grids, the system provides a plug-and-play solution for future site operations looking to lower their carbon footprint.