Shift Thermal, based in Oak Ridge, is the developer of FLEX™ technology, an advanced thermal storage system designed to reduce energy consumption. The company originated as part of the Innovation Crossroads program at Oak Ridge National Laboratory (ORNL). The TennesSeed Fund first invested in Shift Thermal in 2019 during its start-up phase, and Three Roots Capital has since provided continued support through multiple follow-on investments, most recently in March 2025.
