Exhibit 12 NEVADA POWER COMPANY Ratio of Earnings to Fixed Charges and Preferred Dividends (Dollars in Thousands) Combined Proforma NevPwr Spr Combined Twelve Months Ended 3/1/99 3/31/99 Adjust 3/31/99 ---------- ---------- --------- ---------- Interest long term debt 81,236 44,502 36,864 162,602 other interest 7,463 8,355 15,818 one third rentals 813 2,127 2,940 ---------- ---------- --------- ---------- total fixed charges 89,512 54,984 36,864 181,360 ---------- ---------- --------- ---------- Preferred dividends requirements 172 5,459 -172 5,459 Ratio of income before tax to net income 1.54 1.49 -- 1.56 ---------- ---------- --------- ---------- total 265 8,134 -- 8,516 ---------- ---------- --------- ---------- Total fixed charges and preferred dividends 89,777 63,118 -- 189,876 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- EARNINGS Net income (before preferred dividend requirements) 81,220 81,618 -34,155 128,683 Add fixed charges (from above) 89,512 54,984 36,864 181,360 taxes on income 44,150 40,270 -12,902 71,518 ---------- ---------- --------- ---------- Total earnings for purpose of ratio 214,882 176,872 -10,193 381,561 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- Ratio of earnings to fixed charges and preferred dividends 2.39 2.80 -- 2.01 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- NEVADA POWER COMPANY Ratio of Earnings to Fixed Charges and Preferred Dividends (Dollars in Thousands) Combined Proforma NevPwr Spr Combined Twelve Months Ended 1998 1998 Adjust 1998 ---------- ---------- --------- ---------- FIXED CHARGES: Interest long term debt 79,787 44,567 36,864 161,218 other interest 6,018 7,659 13,677 one third rentals 1,132 2,093 3,225 ---------- ---------- --------- ---------- total fixed charges 86,937 54,319 36,864 178,120 ---------- ---------- --------- ---------- Preferred dividends requirements 174 5,459 -174 5,459 Ratio of income before tax to net income 1.54 1.50 -- 1.56 ---------- ---------- --------- ---------- total 268 8,189 -- 8,516 ---------- ---------- --------- ---------- Total fixed charges and preferred dividends 87,205 62,508 -- 186,636 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- EARNINGS Net income (before preferred dividend requirements) 83,673 82,780 -34,155 132,298 Add fixed charges (from above) 86,937 54,319 36,864 178,120 taxes on income 45,471 41,632 -12,902 74,201 ---------- ---------- --------- ---------- Total earnings for purpose of ratio 216,081 178,731 -10,193 384,619 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- Ratio of earnings to fixed charges and preferred dividends 2.48 2.86 -- 2.06 ---------- ---------- --------- ---------- ---------- ---------- --------- ---------- NEVADA POWER COMPANY Ratio of Earnings to Fixed Charges and Preferred Dividends (Dollars in Thousands) Nevada Power Company historical (stand-alone) Twelve Months Ended 1994 1995 1996 1997 1998 3/31/99 ---------- ---------- --------- ---------- ---------- --------- Interest long term debt 56,537 59,900 60,964 70,267 79,787 81,236 other interest 2,572 1,566 2,584 1,531 6,018 7,463 one third rentals 1,203 807 961 982 1,132 813 ---------- ---------- --------- ---------- ---------- --------- total fixed charges 60,312 62,273 64,509 72,780 86,937 89,512 ---------- ---------- --------- ---------- ---------- --------- Preferred dividends requirements 3,976 3,966 3,956 1,125 174 172 Ratio of income before tax to net income 1.55 1.49 1.54 1.54 1.54 1.54 ---------- ---------- --------- ---------- ---------- --------- total 6,148 5,913 6,107 1,736 268 265 ---------- ---------- --------- ---------- ---------- --------- Total fixed charges and preferred dividends 66,460 68,186 70,616 74,516 87,205 89,777 ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- --------- EARNINGS Net income (before preferred dividend requirements) 81,870 76,971 78,868 83,216 83,673 81,220 Add fixed charges (from above) 60,312 62,273 64,509 72,780 86,937 89,512 taxes on income 44,716 37,791 42,884 45,225 45,471 44,150 ---------- ---------- --------- ---------- ---------- --------- Total earnings for purpose of ratio 186,898 177,035 186,261 201,221 216,081 214,882 ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- --------- Ratio of earnings to fixed charges and preferred dividends 2.81 2.60 2.64 2.70 2.48 2.39 ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- --------- ---------- ---------- ---------