Nature of Operations	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Description of Business Unless the context requires otherwise in these notes to the consolidated condensed financial statements, the terms “SHI,” "Soluna," “the “Company,” “we,” “us,” and “our” refer to Soluna Holdings, Inc. together with its consolidated subsidiaries, “SDI” refers to Soluna Digital, Inc., “Soluna Cloud” or “Cloud” refers to Soluna Cloud, Inc., “SEI” refers to Soluna Energy, Inc., and "Soluna Wind" refers to Soluna Wind Holdings, Inc. Soluna Holdings, Inc. (“SHI”) is a digital infrastructure company that specializes in transforming surplus renewable energy into computing resources. The Company’s strategy is to operate data centers co-located with wind, solar, and hydroelectric power plants, supporting compute-intensive applications, including Bitcoin mining, generative AI, and high-performance computing (“HPC”). This approach aims to create a more sustainable grid while providing cost-effective and environmentally friendly computing solutions. Soluna Holdings, Inc. was originally incorporated in the State of New York in 1961 as Mechanical Technology, Incorporated and reincorporated in the State of Nevada on March 24, 2021. On March 23, 2021, SHI's common stock commenced trading on The Nasdaq Stock Market LLC ("Nasdaq"). Headquartered in Albany, New York, the Company changed its name from “Mechanical Technology, Incorporated” to Soluna Holdings, Inc. on November 2, 2021. On October 29, 2021, Soluna Callisto Holdings, Inc. ("Soluna Callisto") merged into Soluna Computing, Inc. (“SCI”), a private green data center development company and subsidiary of SHI. SCI subsequently sold and transferred all its assets in December 2023 to the Company. SHI conducts its business through its wholly owned subsidiary, Soluna Digital, Inc. (“SDI”). Additionally, SHI formed Soluna Cloud, Inc. (“Soluna Cloud”) on March 24, 2024, to operate cloud, colocation, and data hosting services related to high performance computing and AI. On April 2, 2024, SHI formed Soluna Energy, Inc. (“SEI”) to own and manage renewable energy power purchase agreements and land leases through a series of service subsidiaries. In January 2026, SHI formed Soluna Wind Holdings, Inc. to own and operate wind-powered energy generation facilities through its subsidiaries. As of June 30, 2026, the Company has five operating projects under management. In 2021, the Company constructed a 25 MW data center and commenced operations in its Murray, Kentucky location ("Project Sophie"). The Company’s Texas site (“Project Dorothy”), located at the Briscoe wind farm, holds the potential for up to 100 MW of data center capacity. By June 2024, SHI had energized 50 MW of the site across two phases, Project Dorothy 1A and 1B. On July 22, 2024, the Company closed financing for the 48 MW data center (the “Project Dorothy 2”). Project Dorothy 2 is financed by Soluna2 SLC Fund II Project Holdco LLC, an investment vehicle of Spring Lane Capital (“SLC”) and SDI. As of June 30, 2026, SDI has 100% Class A membership and 0% Class B membership interest in Project Dorothy 2. On July 22, 2025, the Company closed financing with SLC for Project Kati 1, a data center campus in Willacy County, Texas. Project Kati 1 has a total capacity of 83 MW. As of June 30, 2026, SDI has 100% Class A membership and 13% Class B membership interest in Project Kati 1. On April 1, 2026, the Company acquired 100% of the issued and outstanding membership interests in Briscoe Wind Farm, LLC ("Briscoe"), a 150 MW capacity wind generation project. See Note 5 for details.

Unless the context requires otherwise in these notes to the consolidated condensed financial statements, the terms “SHI,” "Soluna," “the “Company,” “we,” “us,” and “our” refer to Soluna Holdings, Inc. together with its consolidated subsidiaries, “SDI” refers to Soluna Digital, Inc., “Soluna Cloud” or “Cloud” refers to Soluna Cloud, Inc., “SEI” refers to Soluna Energy, Inc., and "Soluna Wind" refers to Soluna Wind Holdings, Inc.

Soluna Holdings, Inc. (“SHI”) is a digital infrastructure company that specializes in transforming surplus renewable energy into computing resources. The Company’s strategy is to operate data centers co-located with wind, solar, and hydroelectric power plants, supporting compute-intensive applications, including Bitcoin mining, generative AI, and high-performance computing (“HPC”). This approach aims to create a more sustainable grid while providing cost-effective and environmentally friendly computing solutions.

Soluna Holdings, Inc. was originally incorporated in the State of New York in 1961 as Mechanical Technology, Incorporated and reincorporated in the State of Nevada on March 24, 2021. On March 23, 2021, SHI's common stock commenced trading on The Nasdaq Stock Market LLC ("Nasdaq"). Headquartered in Albany, New York, the Company changed its name from “Mechanical Technology, Incorporated” to Soluna Holdings, Inc. on November 2, 2021. On October 29, 2021, Soluna Callisto Holdings, Inc. ("Soluna Callisto") merged into Soluna Computing, Inc. (“SCI”), a private green data center development company and subsidiary of SHI. SCI subsequently sold and transferred all its assets in December 2023 to the Company. SHI conducts its business through its wholly owned subsidiary, Soluna Digital, Inc. (“SDI”). Additionally, SHI formed Soluna Cloud, Inc. (“Soluna Cloud”) on March 24, 2024, to operate cloud, colocation, and data hosting services related to high performance computing and AI. On April 2, 2024, SHI formed Soluna Energy, Inc. (“SEI”) to own and manage renewable energy power purchase agreements and land leases through a series of service subsidiaries. In January 2026, SHI formed Soluna Wind Holdings, Inc. to own and operate wind-powered energy generation facilities through its subsidiaries.

As of June 30, 2026, the Company has five operating projects under management. In 2021, the Company constructed a 25 MW data center and commenced operations in its Murray, Kentucky location ("Project Sophie"). The Company’s Texas site (“Project Dorothy”), located at the Briscoe wind farm, holds the potential for up to 100 MW of data center capacity. By June 2024, SHI had energized 50 MW of the site across two phases, Project Dorothy 1A and 1B. On July 22, 2024, the Company closed financing for the 48 MW data center (the “Project Dorothy 2”). Project Dorothy 2 is financed by Soluna2 SLC Fund II Project Holdco LLC, an investment vehicle of Spring Lane Capital (“SLC”) and SDI. As of June 30, 2026, SDI has 100% Class A membership and 0% Class B membership interest in Project Dorothy 2. On July 22, 2025, the Company closed financing with SLC for Project Kati 1, a data center campus in Willacy County, Texas. Project Kati 1 has a total capacity of 83 MW. As of June 30, 2026, SDI has 100% Class A membership and 13% Class B membership interest in Project Kati 1.