What to know about huge thermal energy storage project coming to Kansas. Topeka Capital-Journal Oct. 1, 2026, 6:31 a.m. CT Antora Energy, a leading U.S. energy storage company, on Oct. 1 announced 5.8-gigawatt-hour, multiday thermal energy storage project in Pratt. Upon completion, it will be one of the largest battery storage systems in the world. Copenhagen Infrastructure Partners, a global fund manager and investor in energy infrastructure, led the project's third-party equity financing. Australian investment firm Grok Ventures and University Pension Plan Ontario also participated in the deal.

GrafTech and Antora partner to power industry with carbon. GrafTech International Ltd. and Antora Energy have announced a strategic collaboration to develop and supply carbon-based materials for Antora Energy's thermal battery systems, creating a new application for GrafTech's manufacturing capabilities in St. Marys, Pennsylvania. The partnership is intended to strengthen the domestic supply chain for emerging energy technologies while supporting industrial employment and manufacturing activity in the region. Under the collaboration, GrafTech and Antora will work together to develop carbon-based materials at GrafTech's St. Marys facility for incorporation into Antora's thermal battery modules. The systems are designed to store electricity as high-temperature heat and subsequently deliver that stored energy to industrial customers as heat or electricity. The companies say the technology can help reduce energy costs for American manufacturers and improve the competitiveness of energy-intensive industrial operations. The partnership also builds on GrafTech's long-standing manufacturing presence in Pennsylvania. GrafTech has operated the St. Marys facility since acquiring it in 2010, while the company brings nearly 140 years of experience in carbon and synthetic graphite-based solutions to the collaboration. A significant portion of the facility's existing bake furnace capacity is expected to be used as part of the partnership. GrafTech has already restarted eight bake furnaces at the St. Marys site, while both companies have hired additional workers in the community. The companies are also recruiting approximately a dozen more employees for positions spanning plant operations, machining, maintenance and other functions. GrafTech President and Chief Executive Officer Timothy Flanagan said the collaboration provides an opportunity to leverage the St. Marys facility and its experienced workforce while expanding the company's end-market exposure. According to Flanagan, the partnership is expected to utilize a significant amount of the facility's bake furnace capacity and establish an important new application for the site. The arrangement is also expected to diversify GrafTech's end markets and contribute to the development of a domestic supply chain for energy storage technologies. The collaboration gives particular importance to the skills and experience of the St. Marys workforce. By using existing industrial infrastructure and personnel capabilities, the companies can support a new energy-storage application while maintaining a connection to the region's established manufacturing base. Antora Co-Founder and CEO Andrew Ponec said sourcing carbon-based materials from GrafTech's Pennsylvania facility will help strengthen the company's domestic supply chain. He described the relationship as an investment in U.S. energy leadership and said the companies are working toward delivering affordable and reliable energy to customers across the country. Antora's thermal battery technology is based on a relatively abundant and established material: carbon. The company's systems store low-cost electricity as heat within insulated blocks of solid carbon. When energy is needed, the stored thermal energy can be supplied continuously as industrial heat or converted back into electricity. The approach is intended to address energy requirements across a wide range of applications. Factory-built thermal battery modules can potentially be deployed at chemical manufacturing facilities, food production plants, steelmaking operations and data centers, as well as in applications serving the broader electricity grid. Unlike many battery technologies that depend on supply-constrained critical minerals, Antora's thermal storage systems use carbon and insulation as core components. The company also emphasizes factory-based manufacturing, which can provide an alternative to energy infrastructure projects that require lengthy construction schedules. The use of carbon creates a connection between emerging thermal energy storage and existing U.S. industrial supply chains. Carbon-based materials are already produced and used domestically in industries including steelmaking and aluminum production, as well as in fireproofing and other industrial applications. For Antora's thermal batteries, carbon blocks and insulation are produced by processing lower-purity carbon feedstocks at high temperatures. Materials such as petroleum coke and coal tar pitch can be heated in specialized furnaces to produce the carbon components required for the thermal storage systems. The companies believe the expansion of thermal energy storage could create additional demand for U.S. petroleum and coal byproducts. As the market develops, materials that have traditionally served as industrial feedstocks could find new applications in large-scale energy storage. The collaboration is also being positioned as an investment in Pennsylvania's manufacturing and energy infrastructure. Representative Glenn "GT" Thompson of Pennsylvania's 15th Congressional District said the project builds on the workforce, infrastructure and industrial expertise that have contributed to Pennsylvania's role in the U.S. energy sector. Thompson highlighted the employment opportunities associated with the partnership and its potential contribution to domestic energy security. He also emphasized the significance of the investment for Elk County, where the St. Marys facility is located. The announcement follows significant growth in Antora's financing and commercial activities. In late July, the company closed an oversubscribed $550 million Series C financing round. The funding is intended to support Antora's efforts to respond to rising energy demand and expand its thermal energy storage technology. Earlier in the year, Antora announced the commissioning of Project Big Stone in South Dakota. The project represents one of the company's largest deployments of thermal energy storage and is already supplying round-the-clock energy to POET at its facility in Big Stone City. POET is described as the world's largest producer of biofuels, making the project an example of how thermal energy storage can be applied to industrial operations with substantial and continuous energy requirements. Antora's technology is designed to provide customers with an alternative approach to managing electricity costs and securing reliable energy. By charging thermal batteries with electricity when power is inexpensive and dispatching stored energy when it is needed, industrial users can potentially reduce exposure to higher electricity costs while maintaining reliable thermal or electrical output. The partnership with GrafTech adds a domestic manufacturing component to Antora's technology strategy. Rather than relying exclusively on overseas sources for specialized materials, the collaboration is expected to use established U.S. industrial infrastructure and a skilled Pennsylvania workforce to supply carbon-based materials for thermal batteries. For GrafTech, the agreement represents an opportunity to apply existing manufacturing assets to the growing energy-storage sector. The St. Marys facility's restarted furnaces and additional hiring demonstrate the immediate operational impact of the collaboration, while future commercial activity could provide a longer-term application for the site. The parties have entered into a Memorandum of Understanding covering the strategic collaboration. GrafTech and Antora intend to negotiate and execute definitive agreements governing the relationship. Those final agreements remain subject to negotiated terms and conditions. If completed as planned, the collaboration could connect Pennsylvania's established carbon manufacturing capabilities with the emerging market for long-duration thermal energy storage. It also demonstrates how existing industrial facilities and materials can be incorporated into new energy technologies as manufacturers seek reliable, affordable and domestically sourced energy solutions. The partnership ultimately combines GrafTech's experience in carbon and synthetic graphite manufacturing with Antora's thermal battery technology. By developing carbon-based materials for thermal storage at the St. Marys facility, the companies aim to support domestic energy infrastructure, create manufacturing jobs and expand the role of established U.S. industrial supply chains in the transition toward new forms of energy storage.

GrafTech and Antora to collaborate on carbon-based thermal batteries. The partnership is set to boost local jobs and expand US energy storage manufacturing at the St. Marys facility. GrafTech International and Antora Energy have announced a collaboration to develop and supply carbon-based materials for the latter's thermal batteries. Under the plans outlined, production will take place at GrafTech's St. Marys facility in Pennsylvania, US. The companies stated that the partnership aims to reinforce domestic manufacturing capabilities in energy technology. Both companies have resumed and expanded operations in St. Marys, with GrafTech restarting eight bake furnaces to meet demand for the project. The collaboration has already led to new hiring at the facility. At least a dozen additional positions are anticipated across several areas including operations, machining and maintenance. GrafTech International CEO and president Timothy Flanagan said: "This partnership is expected to utilise a significant portion of the bake furnace capacity at St. Marys, creating an important new application for the facility while diversifying its end markets and supporting the growth of the domestic energy storage supply chain. "We are particularly pleased that this opportunity builds on the skills and experience of the St. Marys workforce, and we look forward to growing our commercial relationship with Antora." Antora's batteries store electricity as heat using insulated blocks of solid carbon, before delivering this energy as heat or electricity as needed. The modules, manufactured at the factory, can be deployed in sectors such as chemicals, food production, steel, data centres, or the grid. Production of these batteries uses lower-purity carbon feedstocks including petroleum coke and coal tar pitch, processed in high-temperature furnaces. According to the companies, growing demand for thermal energy storage could open new uses for byproducts from the US petroleum and coal industries. Antora co-founder and CEO Andrew Ponec said: "By partnering with GrafTech to source carbon-based materials from their St. Marys facility, Antora is strengthening its domestic supply chain. "GrafTech is a leading Pennsylvania manufacturer, and we are excited to work with them to deliver affordable and reliable energy across the country. This is an investment in America's energy leadership." The collaboration between GrafTech and Antora is currently governed by a memorandum of understanding. Final agreements will depend on negotiation of definitive terms and conditions. In July 2026, Antora Energy completed a $550m Series C funding round to support the rollout of large-scale thermal battery storage systems in the US. Give your business an edge with its leading industry insights.