Southern California Natural Gas RESIDENTIAL $1.06 therm. SDGE electricity residential 29.6 cents per K.W. Edison 21 cents per Kw ENERGY COSTS ARE CACULATED BY TAKIING THE AVERAGE RESIDENTIAL ELECTRIC OR GAS BILL AND DIVIDING IT BY THE TOTAL ENERGY USED. THIS IS THE TRUE COST WHICH INCLUDES TAXES, DELIVERY COST AND ALL OTHER ADD ONS.