State of charge
Current state of battery
Depth of discharge
Capacity that has been used
Round-trip efficiency
Ratio of energy recovered to energy input
Self discharge rate
Decreases shelf life of batteries
price formation
come up with price of system based on dispatch
revenue streams ($/kW-year)
vary by node: spinning reserve, energy arbitrage, capacity/DR, energy regulation
energy and capacity
power plants are compensated for both
capacity markets
forward markets directing investment or long-term price signals
electricity buy/sale
bought wholesale, sold retail
auction markets
resources bid at their total cost of operation
clearing price
set by most expensive unit needed to meet demand