I've met one of the Stem management execs, and heard the pitch.
What they're doing is to smooth out the spikes in the day to day energy usage. Their software will learn the usage pattern over time, and try to predict when spikes will occur. The battery will then discharge during spikes to prevent triggering additional peak demand charges.
What they're doing is to smooth out the spikes in the day to day energy usage. Their software will learn the usage pattern over time, and try to predict when spikes will occur. The battery will then discharge during spikes to prevent triggering additional peak demand charges.