Dig Energy has developed a compact water-jet drilling rig intended to dramatically reduce the upfront cost of shallow geothermal ground loops for heating and cooling. The founders, Dulcie Madden and Thomas Lipoma, spent about five years in stealth refining the design and drilling test holes through various soils and rock types near their New Hampshire offices. The company claims its rig can cut drilling costs by up to 80% and produces straighter holes that can be placed closer together than those from conventional rigs. Dig plans to sell its rigs to drillers and is preparing a slightly larger production version for initial commercial pilots supported by its recent seed round. The startup is positioning its technology to enable broader adoption of geothermal by making rigs small enough to access constrained sites such as backyards and crowded commercial lots.

Total raised

$5M

Funding rounds

1

Latest round

Seed

Latest activity

Sep 2025