every 14) each year. This defines the total installed generating capacity required for a power pool and thereby the installed generating margin (Margin ■ total minus peak demand). The total required number of one gegawatt generators, n, can be defined by the following equation: where n^ is the number of conventional generators required to meet the LOLP criterion during the £'th maintenance interval and "a" equals the number of maintenance intervals per year when each generator must be off-line. A 5 GWe SPS may or may not be on-line during the £'th interval; its availability should be explicity assumed when deriving
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