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    Constrained down generation

    Transmission Constraint Management (TCM) rule cost reporting

    The Alberta Utilities Commission has directed us to report on costs of the Transmission Constraint Management rule, including cost of constrained-down generation and transmission must run.

    Constrained down generation

    Occasionally, insufficient transmission capacity causes generation to be constrained. These types of situations are mitigated by AESO system controllers but are sometimes unavoidable. The AESO reports on constrained-down generation in all regions of the province.

    Table 1: Annual total estimated constrained-down generation (GWh) 

    Year Central East Cold Lake Crossfield KEG North – South Northeast Northwest South All
    2011 4 0 1 81 5 14 0 3 108
    2012 7 0 0 54 0 21 0 1 84
    2013 19 0 2 43 1 33 3 2 103
    2014 1 0 0 131 1 13 0 3 149

    Table 2: Number of hours with constrained-down generation

    Year Central East Cold Lake Crossfield KEG North – South Northeast Northwest South All
    2011 84 0 29 304 44 384 0 861 1465
    2012 71 0 10 196 5 335 12 294 932
    2013 246 7 193 126 10 503 311 388 1596
    2014 8 19 0 322 5 227 29 150 760

    Download the latest constrained-down generation report.