Cause Category	Fall	Spring	Summer	Winter
equipment failure	389.500000	4959.764706	292.809524	712.800000
fuel supply emergency	793.666667	16503.285714	7626.166667	18935.937500
intentional attack	334.772727	782.256881	331.757143	490.781609
islanding	69.000000	88.444444	231.882353	385.000000
public appeal	244.000000	2152.285714	1187.625000	2592.636364
severe weather	5646.116883	3287.683333	3214.765343	3869.321053
system operability disruption	371.466667	529.885714	1152.093023	592.333333