Sodium-Sulfur (NaS 300°C High-Temperature Long-Duration Storage) LCOS Calculator 2026

Model 20MW / 120MWh molten sodium-sulfur (NaS 300°C beta-alumina solid electrolyte) grid batteries (80% round-trip efficiency with 15-year zero-degradation calendar life), calculating levelized cost of storage (LCOS).

Underwriting Assumptions

Rated NaS Plant Power (MW)

Discharge Duration (Hours)

Turnkey NaS Battery Enclosure Capex ($M)

Off-Peak Charging Power Price ($/MWh)

Peak Capacity Arbitrage Price ($/MWh)

Annual Full Cycles

Projected Economics

Gross Annual Power Arbitrage Sales

Net Annual Operating Cash Flow

Capital Payback Period