First Quarter 2015 Highlights Bison Herd at the Rawhide Energy Station Financial Summary Platte River reported first quarter operating income of $2.8 million compared with $3.6 million reported during the first quarter of 2014. Operating revenues decreased $0.6 million from the same period last year mainly due to a $1.0 million decrease in surplus sales as a result of a soft market. Offsetting some of the decrease was a $0.4 million increase in municipal sales. The increase was primarily the result of a 2.5% increase in wholesale rates. Operating expenses were up $0.2 million. Administrative and general expenses increased $1.0 million due to demand side management incentives and strategic planning initiatives. The demand side management incentive increase is due to timing of completion of customer projects. Purchased power was also higher by $0.6 million from an increase in wind purchases from the new Spring Canyon contracts. Offsetting the increases was a $1.4 million decrease in depreciation as many Rawhide and Craig assets reached the end of their depreciable life in 2014. Income before contributions for the first quarter was $1.0 million, down from the $1.8 million reported during the same period last year. Total debt service coverage for the quarter was 1.24 times. Power Production During the first quarter, Rawhide Unit 1 reported a net plant capacity factor of 88.5%, up from the 87.9% reported for the same period last year. The lower capacity factor in 2014 was due to a one-week scheduled maintenance outage at Rawhide during the month of March. In 2015, the unit was held back to build coal inventory levels and in response to the soft surplus sales market. Craig Units 1 and 2 reported a combined plant capacity factor of 78.1%, down from the 87.4% reported first quarter last year. The units experienced maintenance issues and were also held back due to the soft surplus sales market. Other generation for the first quarter included 84,337 MWh of wind. Operating Statistics Platte River supplied 774,474 MWh to its four municipal owners, down 0.7% from the first quarter last year. The total monthly Municipal billing demand was also down 2.4% for the same period. Municipal Peak Demand (kW) 3 Months Ended March 31 2014 2015 510,668 469,967 Municipal Energy Sales (MWh) Other Energy Sales (MWh) 774,474 259,772 780,301 237,148 12 Months Ended March 31 2014 2015 648,709 625,517 3,148,450 792,928 3,199,068 709,764 Page 1 of 2 CONDENSED STATEMENTS OF NET POSITION Unaudited (In Thousands) March 31 2015 ASSETS Electric utility plant, net Special funds and investments Current assets Non-current assets Total assets $ DEFERRED OUTFLOWS OF RESOURCES LIABILITIES Non-current liabilities Current liabilities Total liabilities DEFERRED INFLOWS OF RESOURCES NET POSITION $ 2014 567,096 103,469 92,936 4,208 767,709 $ 577,849 95,434 90,575 4,907 768,765 1,689 2,781 216,838 45,833 262,671 242,844 44,127 286,971 10,840 4,336 495,887 $ 480,239 CONDENSED STATEMENTS OF REVENUES, EXPENSES AND CHANGES IN NET POSITION Unaudited (In Thousands) 3 Months Ended March 31 2015 2014 OPERATING REVENUES: Sales to municipalities Sales for resale and other Total operating revenues $ OPERATING EXPENSES: Operations and maintenance Depreciation Total operating expenses OPERATING INCOME NONOPERATING REVENUES AND EXPENSES: Interest and other income Interest expense, net Net increase/(decrease) in fair value of investments Total nonoperating revenues and expenses INCOME BEFORE CONTRIBUTIONS Contribution of assets to municipalities CHANGE IN NET POSITION $ 41,121 8,103 49,224 $ 12 Months Ended March 31 2015 2014 40,779 9,073 49,852 $ 170,115 29,124 199,239 $ 170,472 26,964 197,436 39,666 6,729 46,395 38,122 8,107 46,229 148,156 26,996 175,152 143,654 33,139 176,793 2,829 3,623 24,087 20,643 467 (2,512) 195 (1,850) 859 (2,707) 7 (1,841) 1,619 (10,130) 227 (8,284) 516 (10,905) (79) (10,468) 979 1,782 15,803 10,175 - - 979 $ 1,782 (155) (155) $ 15,648 $ 10,020 Page 2 of 2