The Alberta Electric System Operator (AESO) is the non-profit organization responsible for operating Alberta, Canada's power grid. AESO oversees the planning and operation of the Alberta Interconnected Electric System (AIES) in a "safe, reliable, and economical" manner. It is mandated by provincial legislation to act in the public interest and cannot own any transmission, distribution or generation assets. One of AESO's responsibilities is to manage system load in the case where shortfalls in supply or excessive demand for electricity threaten the integrity of the power grid. In this case AESO can direct power companies to shed load temporarily through measures such as rolling blackouts. In July 2012, six power generators were shut down during a major heat wave that resulted in high demand on the power grid, Edmonton, Calgary, Red Deer and Lethbridge were hit by rolling blackouts. AESO directed utilities to reduce their customer load. AESO's Doug Simpson explained that this had not happened since 2006. More information...
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