About Kraftblock
Company Overview
Kraftblock GmbH
HeadquartersSulzbach/Saar, Germany
Founded2014
SizeApproximately 40 employees (source: linkedin.com)
What They Do
Kraftblock GmbH specializes in the development and manufacturing of modular high-temperature thermal energy storage systems, primarily used in industry, district heating, and power plants. The technology is based on a patented storage granule and a thermal storage platform capable of storing temperatures up to 1,300°C for up to two weeks, utilizing recycled raw materials and high thermal conductivity (source: iqony.energy). Kraftblock focuses on efficiently capturing, storing, and supplying waste heat from industrial processes as process heat on demand, aiming to reduce reliance on fossil fuels in energy-intensive industries (source: kraftblock.com). The company clearly positions itself in the field of high-temperature thermal storage, offering a modular solution that differs from conventional battery storage or energy generation systems (source: kraftblock.com). Kraftblock collaborates closely with partners from the steel industry, energy sector, and engineering to develop innovative solutions for decarbonizing industrial heat processes (source: tatasteel.com).
Projects & Track Record
One of Kraftblock's most notable projects is the thermal energy storage system at Tata Steel in Jamshedpur, India. A pilot project was implemented at Sinter Plant 3, operational since May 2025, recognized as the first industrial high-temperature storage project in the steel sector (source: kraftblock.com). The system stores waste heat from the sintering process and uses it to heat process water, resulting in reduced fuel consumption and saving approximately 22,000 tons of CO2 annually (source: tatasteel.com). The facility has a storage capacity of 20 MWh and can save about 110 GWh of gas per year (source: kraftblock.com). Additionally, the project was awarded the "Deployed Solution of the Year" in December 2025 as part of Tata Steel's Total Quality Management Program (source: kraftblock.com). Another significant project is the FlexKWK initiative launched in 2023, where Kraftblock, together with Iqony Solutions GmbH, Steinmüller Engineering GmbH, and the University of Duisburg-Essen, is researching the integration of high-temperature storage in heating and power plant applications (source: iqony.energy). Furthermore, a feasibility study was conducted in Australia with AGL and ARENA to explore the use of Kraftblock systems for steam generation for a 200 MW turbine in a gas power plant (source: kraftblock.com).
Recent Developments
Over the past two years, the focus has been primarily on the successful operation of the Tata Steel pilot project, recognized as the first industrial high-temperature storage project in the steel sector, which celebrated its one-year anniversary in February 2026 (source: tatasteel.com). This project also received a prestigious award from Tata Steel and serves as proof of the commercial viability of high-temperature storage in the steel industry (source: kraftblock.com). Kraftblock has intensified its public communications and is increasingly positioning itself as a pioneer in the decarbonization of industrial heat processes (source: kraftblock.com).
Working There
Kraftblock primarily offers positions in engineering and operations, with a focus on service and maintenance engineer roles at its headquarters in Sulzbach/Saar (source: kraftblock.jobs.personio.de). The company culture is characterized by flexible home office arrangements that support modern working models (source: kraftblock.com). The organizational structure includes technical departments as well as functions in communications, human resources, and leadership, with a clear focus on specialized technical and commercial management (source: izes.eu). Kraftblock positions itself as an innovative, technology-driven company with a start-up character operating in a specialized market segment.
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