means the component of a power plant that produces, from any source, electric energy and ancillary services, and includes facilities that are necessary for the safe, reliable and economic operation of the generating unit.
Any apparatus which produces electricity including, for the avoidance of doubt, a CCGT unit. Generation Uncertainty Model (GUM) A computer program, which provides a probabilistic representation of the electricity market based on a set of input assumptions relating to demand and generation. Using Monte Carlo techniques, GUM generates up to 10,000 probabilistically derived backgrounds and calculates transfers into and out of specified zones, or groups of zones, for each background. The characteristics of the resultant transfer ranges provide an indication of the future transfers most likely to be experienced.