Mammoth South Solar is the second phase of the Mammoth Solar project, one of the largest solar projects in the U.S. Mammoth South is estimated to generate 300 MW of energy and is currently under construction in Pulaski County in northwest Indiana. This project is expected to generate enough clean energy for approximately 65,0000 households.
Mammoth South has executed a long-term a power purchase agreement (PPA) with AEP Energy, a subsidiary of American Electric Power and one of the largest electric energy wholesale and retail suppliers in the U.S.
The project was launched in November 2022 in a ceremony that featured community partners and landowners from Pulaski County, as well as leaders and elected officials from the state of Indiana. Doral Renewables announced that the project, alongside the Mammoth Central project, also in Pulaski County, has achieved financial closing in May 2025, and began substantial construction shortly after. Mammoth South is expected to become operational by the end of 2026 or early 2027.
The project will incorporate agrivoltaics within the site during its operational period, reflecting our commitment to agrivoltaics deployment and to our farming community partners. At Mammoth South, dual-use practices will play a central role—ranging from livestock grazing for vegetation management, to the establishment of pollinator habitats, and even crop production. These initiatives will be led by local farmers, enabling them to return to heritage farming practices, maintain active farm operations, optimize land use, and diversify their revenue streams.
The Mammoth Solar project in its entirety is expected to generate 1.3 GW of energy, which will power approximately 275,000 households annually and spreads across Starke and Pulaski counties in northwest Indiana. The project was named “Mammoth” because of ancient mammoth bones discovered in fields where it would be built and because of the growing size and scope of the mammoth project.
This project started in 2019 as a grassroots effort in the homes and barns of local farmers. Today, Mammoth has over 65 families, who lease their land to Doral Renewables as part of this project. Upon the decommissioning of the project, the landowners receive their land back and can utilize it as they see fit.
