How much does 500kw energy storage cost1. The approximate cost of a 500 kW energy storage system can range between $300,000 to $600,000, depending on various factors including technology type, installation complexity, and local market conditions. It is recommended that you download this load table, compare it, and fill in the corresponding information: (This form is not mandatory. If there is no electrical equipment in use, please. Thermal storagehas the lowest cost. To discuss pricing and options, please, place an order and we will give you a call or give us/Carl a call. As of February 2025, prices now dance between ¥9,000 for residential setups and ¥266,000+ for industrial beasts.