Qualifying energy storage systems may store the following types of energy for use as electrical energy at a later date or in a process that offsets electricity use at peak times: Electrical energy; Mechanical energy; Chemical energy; or Thermal energy. Qualifying energy storage systems shall maintain certain safety criteria, namely: Use equipment certified by a nationally recognized testing laboratory (NRTL); Be installed by a licensed electrician, for electrical systems; and Be in compliance with all applicable building and fire codes. Qualifying energy storage systems shall also meet the following: Be installed in Maryland; and Abide by Maryland regulations regarding interconnection with the electric utility and grid, if applicable. The Administration may adjust energy storage system qualifications across program years.