Soluna Holdings, Inc., together with its subsidiaries, engages in the mining of cryptocurrency through data centres. It operates through three segments, Cryptocurrency Mining, Data Center Hosting, and High-Performance Computing Services. The company also operates in the blockchain business. In addition, the company develops and builds modular data centres that use for cryptocurrency mining. Further, it provides data centre hosting services, including electrical power and network connectivity to cryptocurrency mining customers. Soluna Holdings, Inc. was formerly known as Mechanical Technology Inc and as changed to Soluna Holdings, Inc. in November 2021. The company was founded in 1961 and is headquartered in Albany, New York.