Forest Frizzell, CEO of Shifted Energy, wants to make sure that the rewards from helping his home state of Hawaii move to 100 percent carbon-free electricity don’t just belong to the lucky few who can afford rooftop solar systems and home batteries. That’s largely because the software and hardware required to understand just how much power thousands of water heaters are using at any moment in time is technically challenging to design and expensive to implement — potentially more complex and costly than the grid services are worth. Absorbing excess power is a service that’s becoming more valuable on power grids that generate a surplus of renewable energy at certain times of the day