What are the key electrical requirements of energy codes like ASHRAE 90.1?

ASHRAE 90.1 electrical requirements include: lighting power density limits by space type (W/ft2), mandatory lighting controls (occupancy sensors, daylight harvesting, time scheduling), exterior lighting limits, transformer efficiency requirements, and motor efficiency standards. Receptacle controls for specific loads and automatic receptacle control in offices. Documentation includes lighting power calculations, control schedules, and equipment efficiency data. Performance path allows tradeoffs if overall energy use meets targets.