A Brief History of Utility Planning
Prior to the 1990s, investor-owned utilities (IOUs) were largely vertically integrated, housing each utility function—generation, transmission, and distribution—under one roof. This structure, and the large, centralized nature of generation resources at the time, gave rise to a planning process that involved forecasting customers’ demand, building generation to support that demand, and then planning for the necessary transmission and distribution to support energy delivery.
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