This report analyzes the cost of lithium-ion battery energy storage systems (BESS) within the United States grid-scale energy storage segment, providing a 10-year price forecast by both system and tier one component. Lithium Iron Phosphate (LFP) batteries are the focus of the report, reflecting the stationary BESS market’s movement away from Nickel Manganese Cobalt (NMC) chemistries. The pricing outlook for NMC 811 BESS is provided as a reference within this report. This is a mid-term pricing report, published as an update to the full-length US grid-scale energy storage pricing report released in May. All system-level and component-level analyses have been updated, but qualitative analysis of the cost drivers will next be updated in the next full-year report.