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Most electric systems experience a summer demand peak, but there is also a large winter peak, which for some (generally rural) systems actually exceeds their summertime peak loads. Whether sufficient wholesale power can flow between systems to preempt the need to burn gas during the winter electric peak will be a crucial factor that gas system planners watch closely as they make their compression investment decisions. To assess this properly, these planners must evaluate the dispatch profile of the regional power pools, and determine if the marginal fuel to meet the winter peak will be coal, fuel oil or gas. If the marginal fuel is gas, even assuming the higher seasonal commodity price and higher peak season transportation costs, this will point to a set of incremental system expansions and compression capacity additions that will need to be profitable with a very low initial utilization factor, or be "stranded" for some time until general market growth catches up.