PROTECT YOUR POWER. AND YOUR WALLET. With KOHLER® Power Reserve energy storage system, you’ll never lose power during an outage. And you’ll save big on your utility bill. TM BYE, BYE BLACKOUTS. HELLO SAVINGS. Introducing KOHLER Power Reserve, an energy storage system that keeps your home powered during an outage—and provides energy independence from the grid. For homes with solar panels, Power Reserve stores the solar energy gathered throughout the day and reserves that energy for use whenever you want it.