The market for storing electricity is drawing not only startups building new technology but also new comers that want to build and install new projects. Meet Solar Grid Storage, a two-year-old, angel-funded startup which just completed a project that mixes batteries with solar panels and electric car charging stations in Maryland.

The Philadelphia-based company is one of a growing crop of storage project developers that has materialized in recent years to stake a claim in a young market that’s being shaped by public policies to promote clean energy use and reduce greenhouse gas emissions.