Japan Energy Fund has invested in Natel Energy through its Decarbonized Tech Fund managed by Japan Energy Capital.
Natel Energy is a US-based sustainable energy company that offers both a proprietary, fish-safe Restoration Hydro Turbine design and a SaaS solution called HydroForecast.
https://www.japanenergyfund-ventures.com/natel-energy-press-release
Climate change website The Cool Down praised Natel's FishSafe™ turbine designs, calling them "airbag[s] for fish."