The average cost per watt ranges from $2. 50, including equipment, installation, and any other necessary components. For example, a 10 kW system might cost around $25,000, resulting in a cost of. Energy Storage System (ESS) – The cost to the installer of adding an energy storage system, as delivered. The PV System Cost. Levelized cost of electricity (LCOE) and levelized cost of storage (LCOS) represent the estimated cost required to build and operate a generator and diurnal storage, respectively, over a specified cost recovery period. This article explores price drivers, global market trends, and actionable insights for businesses adopting renewable energy solutions.