Continual power system
A continual power system is a system for reliably supplying uninterrupted power. Examples of a continual power system include uninterruptible power supplies and emergency power systems. The need for continual power systems has risen because more and more essential services depend on consistent power, such as lighting, computing, and communications.
Continual power systems are used because energy provider's roles and responsibilities are not rigorously defined.
The key to reliable power systems is to avoid power disturbances, such as deviation of voltage or current in an ideal single-frequency sine wave with constant amplitude and frequency.
In a 2011, study conducted with Flemish households, researchers found that a relatively small share were willing to accept lower reliability in return for a small bill discount.