Newer furnaces (since around 2010) use electronic ignition systems, and do not have a pilot light. An electronic ignition creates a flame/spark when needed, but does not require a constant flame or 'standing pilot'. These newer systems are safer and more reliable. Also, because a conventional pilot lights burns all times, they use more gas, which is not efficient. Electronic ignitions are replacing pilot lights in many gas-burning appliances in addition to furnaces.