Retrofitting 1,000 electric water heaters with grid interactive controllers can create about three megawatt hours of storage for renewable energy...every single day.

If you control water heaters to heat when there is excess renewables on the grid, they become a viable alternative and complementary solution to battery-based grid storage solutions.

Our solution preheats water to consume excess renewables while algorithms optimize hot water availability for participants. Our solution also provides fast demand response as well as value add solutions for participants such as leak detection, maintenence alerts, and automatic powerdown when units are not occupied.

We have hundreds of systems deployed and slowly scaling up to start servicing markets beyond Hawaii.

How our solution works

We work with utilities and microgrid operators to identify suitable tanks to replace with high efficiency electric water heaters. We also retrofit existing water heaters.

We install the selected systems and leverage existing communications infrastructure or install a communications infrastructure. We can also tie into custom communication systems including smart grid networks.

We work with you to identify how your fleet of water heaters should consume energy and then setup automated controls. We ensure participant comfort by only aggregating tanks that need preheating and temporarily exclude colder tanks.

We can integrate into energy management systems or enable custom web based administration applications so you can control your dispatchable fleet as needed. We also provide real time dashboards to monitor your fleet's performance and have a comprehensive participant support portal to ensure excellence service.

Additional benefits

Low cost grid services

Utilities can use fleets of grid-enabled water heaters for load shifting, demand response, arbitrage, ancillary services, or to respond to unexpected grid-stabilization events. See this white paper for more info.

Ready to scale

We have more than 650 systems under contract with multiple customers. We can integrate our solution quickly into residential and small business locations including participant recruiting.

Reach underserved communities

Our solution can easily be deployed in underserved communities including rental units, apartment buildings, and small businesses to help enable equitable participation across clean energy programs.

Interested in learning more?

You can reach us at