15% 2% 57% 26% Business Profile Generation Largest baseload generation fleet in ERCOT with around-the-clock assets that dispatch at low heat rate levels Top decile nuclear plant production and cost performance Top quartile coal fleet production and cost performance Liquidity-light natural gas hedging program designed to provide cash flow security (~62% hedged for Jan 1, 2011 – Dec 31, 2014) Comanche Peak expansion through Mitsubishi partnership may provide a low-cost nuclear growth option 14% 33% 38% 15% Coal Gas Nuclear Generating Capacity1 as of 12/31/10 Total Net Generation2, 2010 15,427 MW 76,631 GWh New Build-Coal Safety Wholesale power prices Natural gas hedge program Baseload reliability Mining operations Fuel costs O&M costs Operational excellence/continuous improvement Competitive market Value Drivers 1.33 1.35 2.71 1.74 2008-2010 Average 2013E Lignite Delivered PRB Lignite vs. PRB Fuel Cost ($/MMBtu) Note: Total lignite and PRB fuel expense excluding emissions. Luminant is the largest power generator in Texas. Luminant Business Summary 7 1 Includes four mothballed units (1,655 MW) not currently available for dispatch and eight units (1,268 MW) currently operated for unaffiliated parties. 2 Excludes purchased power |