Island Frequency Controller CFC | AGC - Setpoint 80 100 60 40 20 61.50 57.50 61.00 60.50 60.00 59.50 59.00 58.500 58.00 57.00 75 MW Unit #1 (CFC) 75 MW Unit #2 (Base Load) 60 Hz 59.8 Hz 38 28 27 CFC Unit Pulses To Target of 60Hz Base Unit Pulses To AGC Target Setpoint 33 32 Adding 20 MW load GOV-FF (Xcel) Add 10 MW of Load Total load initially = 55 MW Total load increased to 65 MW

Cold Load Pickup 100 90 80 If modeled load = 10 MW and desired load is 5 MW, then taking into account Cold Load pickup, anticipated load is 20 MW (double the modeled load value). Therefore in order to pickup 5 MW I have to scale my load to half of that or 2.5 MW. 70 60 Load 50 40 30 20 10 Time