length[period]

Length per period (in hours)

demand[period]

Demand per period (in megawatts)

num_avail[type]

Number of units available per generator

min_level[type]

Minimum level (in megawatts) per generator

max_level[type]

Maximum level (in megawatts) per generator

unit_cost[type]

Hourly cost (in pounds) of running each generator at minimum level

excess_cost[type]

Extra hourly cost (in pounds) per megawatt at which a unit is operated above minimum level

startup_cost[type]

Cost (in pounds) of starting up each generator

reserve

Additional fraction of estimated load required to be met by generators already in operation