Electricity is not required for Alcor's patient care system. Liquid nitrogen is used to keep cryonics patients cold, not electricity. While in a liquid state, liquid nitrogen maintains temperature at -195.8 °C (−320 °F). The insulated containers where the patients are stored, called dewars, can maintain temperature for up to 6 months in case of an emergency.
Liquid nitrogen is refilled once per week to keep all dewars and the bulk nitrogen tank topped off.