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Nor-Cal tied together five (5) stand-alone control networks, separated by 25 miles, into one comprehensive SCADA control system network, in a common control room.

Nor-Cal also added logic sheets, including Big Block (BBL/MACRO) to allow for Automatic Generation Control (AGC): generation equipment that automatically responds to signals from the California ISO’s EMS control in real time to control the power output of electric generators within a prescribed area in response to a change in system frequency, tie-line loading, or the relation of these to each other, so as to maintain the target system frequency and/or the established interchange with other areas within the predetermined limits.

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