Holtec’s Long-Duration Thermal Storage System Poised to Transform Energy Conservation

Source: www.gulfoilandgas.com 1/10/2025, Location: North America

We are pleased to announce that our Green Boiler™, a long-duration thermal storage system, equipped with virtually limitless thermal storage capacity and the ability to provide pressurized steam at desired pressure(s) on demand, is now being offered to prospective users as a turnkey supply. The first deployments are likely to be in India whose solar power generation industry, fueled by robust government-funded research and a dynamic private clean energy sector, is sizzling with demand for industrial scale energy storage devices putting the sun-rich country on the path to becoming a “solar superpower.” Other sunny regions of the earth, such as southern Europe, the Middle East, Southeast Asia, Australia and Africa stand to benefit most from the rise of concentrated solar power technology and large-scale long duration energy storage being championed by our company.

The Holtec Green Boiler™ (HGB) will eliminate the need for the vast population of Li-ion batteries needed to store solar energy on an industrial scale whose vulnerability to fire, reliance on exotic materials, rapid energy loss rate, short service life and relatively high cost have made them the Achilles heel of the (intermittently available) renewable energy industry. In contrast to batteries, the Holtec Green Boiler™ is made of commonly available non-combustible materials, is compact, has vast storage capacity and has an expected service life of well over 40 years. Holtec Technical Bulletin #HTB-081 which provides more details on the HGB can be found here.

Large scale deployments of HGB, shown in the figure on the right, will follow initial prototypical demonstrations which are planned for both the U.S. and India in 2025.

There are many avenues for inputting energy into a Green Boiler™ which it stores as thermal energy, such as:

A concentrated solar plant such as Holtec’s HI-THERM™ HCSP
Surplus power from the grid (in time periods when it is typically most inexpensive, even free, such as during night hours in some regions) Waste heat from industrial processes that are often untapped and rejected to the environment

The most natural application of the HGB relates to the concentrated solar power collection plants that can deposit their high temperature solar heat into the HGB. Long duration thermal energy storage systems give its user the ability to store thermal energy when it is abundant and to use it when it is needed. In addition to serving as a giant thermal capacitor, the Holtec Green Boiler™ also has the built-in capability to produce steam at the pressure and temperature desired by the user.

We look forward to integrating the HGB in our SMR-300™ reactor deployment where it will serve as a standby energy/steam source to make the nuclear plant entirely autonomous, i.e., able to start up without off-site power (Black start), and operate in “island mode” without burning a single BTU of fossil fuels. The HGB will also help cut capital and operating costs of the SMR-300™ nuclear plant while also improving its thermodynamic cycle efficiency.

Holtec’s global drive to provide concentrated solar plants and the Holtec Green Boiler™ is led by a 30-year veteran of solar energy, Senior VP, Rabindra “Rabi” Satpathy based in Holtec Asia.

Mr. Satpathy’ s mandate to evangelize the adoption of solar energy and the Green Boiler™ for power generation and energy conservation is supported by a number of Holtec’s business development professionals with regional responsibilities including VP. Riaz Awan based in Ukraine (for Eurasia), Director Gareth Thomas based in Great Britain (for the UK), Director Rafael Marin based in Spain (for EU and Spanish Latin America), Dr. Haizhen Pan based in Camden (for the Far East), Mr. Corey DeWitt based in Pittsburgh (for North America), and Mr. Luiz Celso (for Brazil).

“The intensive applied R&D to support the global adoption of HGB and HI-THERM™ HCSP is being spearheaded by Mr. Ed Bell, supported by a multi-national team of solar technology leaders based in India, Spain and the U.S. who are driving these technologies to keep them true to Holtec’s credo, ‘A Generation Ahead by Design,’” says Dr. Rick Springman, Holtec’s President of Global Clean Energy Opportunities.

Mr. Satpathy is matrixed to Ms. Joy Russell, a long-serving Holtec executive with responsibility for commercial pricing strategies and communications who predicts the Solar energy and Green Boiler™ enterprise units of the Company “will rise rapidly in the coming years reaching a billion dollars in annual sales by 2027 and continuing on a J-curve trajectory in the subsequent years.”


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