(c) For purposes of Section 7059 of the Code and this division, a licensee classified in this section may install a battery energy storage system as “incidental and supplemental” to the installation of a photovoltaic solar energy system if the battery energy storage . (c) For purposes of Section 7059 of the Code and this division, a licensee classified in this section may install a battery energy storage system as “incidental and supplemental” to the installation of a photovoltaic solar energy system if the battery energy storage . What is the reason for the characteristic shape of Ragone curves? For purposes of this division, “battery energy storage system” means one or more devices, assembled together, capable of storing energy in order to supply electrical energy at a future time. For the purposes of this chapter division, “Board” means the Contractors State License Board and “Code,”. New Article 706 applies to permanently installed energy storage systems (ESS) such as this battery room operating at over 50 volts ac or 60 volts dc. The ESS may be stand-alone or interactive with other electric power production sources. Code Change Summary: A new article was added to address. Energy storage systems are essential in modern energy infrastructure, addressing efficiency, power quality, and reliability challenges in DC/AC power systems. These storage. Energy storage technologies are classified into a variety of systems, which can be divided into five broad categories: mechanical, electrochemical (or batteries), thermal, electrical, and chemical storage technologies (Figure 1). Energy storage technologies classification.