Governor’s Energy Summit Craig Wagstaff Executive Vice President & COO, Questar Gas

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Source: NGV Global (2014); Current Natural Gas Vehicle Statistics 3

4 There are more than 16 million natural gas vehicles on the road worldwide – but only about 140,000 are in the United States. North America 140,000 NGVs South America 4,800,000 NGVs Europe 1,700,000 NGVs Africa 186,000 NGVs Asia and Middle East 9,700,000 NGVs Source: NGV Global (2014); Current Natural Gas Vehicle Statistics

Dec. 2012NGVsStations Iran3,000,0001,960 Pakistan2,900,0003,330 Argentina2,140,0001,902 Brazil1,739,6761,701 China1,577,0002,784 India1,250, Italy746, Ukraine390, Colombia380, Thailand378, North America140,0001,167 Source: NGV Global (2014); Current Natural Gas Vehicle Statistics

 2013 – 1,472 CNG/LNG stations - 1,379 CNG stations - 93 LNG stations  CNG Stations – 1,379 Total Public access stations Private access stations  LNG Stations – 93 Total - 54 Public access stations - 39 Private access stations 1,000 CNG LNG Public Access Private Access 1,400 1,300 1,200 1,100 Source: Alternative Fuels Data Center (2014);

2008 ANGA looks to transportation market Increase NGV Fueling Capacity 50% Automaker Meetings State of Utah opens it’s CNG stations to public Gasoline hits $4/gallon Shale Gas AGA/ANGA “collaborative”

2008 ANGA looks to transportation market Guv Huntsman announces 1-15 NGV corridor Increase NGV Fueling Capacity 50% Automaker Meetings GM announces: Chevrolet Express Van State of Utah opens its CNG stations to public Gasoline hits $4/gallon Shale Gas AGA/ANGA “collaborative” DOE Clean Cities Award $15 million

2008 ANGA looks to transportation market Guv Huntsman announces 1-15 NGV corridor Medium-Duty Truck Private investment into new NGV- fueling stations Increase NGV Fueling Capacity 50% Automaker Meetings GM announces: Chevrolet Express Van State of Utah opens its CNG stations to public Gasoline hits $4/gallon Shale Gas AGA/ANGA “collaborative” DOE Clean Cities Award $15 million

2008 ANGA looks to transportation market Guv Huntsman announces 1-15 NGV corridor Medium-Duty Truck Over-the-Road Truck Testing Private investment into new NGV- fueling stations Increase NGV Fueling Capacity 50% Automaker Meetings GM announces: Chevrolet Express Van Dodge and Ford State of Utah opens its CNG stations to public Gasoline hits $4/gallon Shale Gas AGA/ANGA “collaborative” DOE Clean Cities Award $15 million Low NGV pump price Honda announces increased production of Civic

Industry Experience  30 Questar Gas Stations  5 State/Municipal Stations  8 Private/Public Stations 12

GallonsCost/Gal.

14 Source: Annual Energy Outlook (2012); EIA EIA Forecasts Forward looking price differential remains favorable between diesel and natural gas *Forecast is in 2010 dollars

8.9 Liter Available Cummins ISL G OEM Cummins ISX12G 12.0 Liter Available limited volumes first half of 2013, full production second half of 2013 Volvo 13.0 Liter Engine November Liter, 2010 Cummins Engine Conversion Kit Available for Market EPA Certified – DNG Power June 2007 January 2014 March Liter 2010 Detroit Conversion Kit Available EPA Certified – DNG Power July

 Adoption rate in leading markets moving faster than the gasoline to diesel transformation 100% 75% % 0% Share % New sales of Class 8 diesel trucks, USA 1,2 New sales of natural gas refuse trucks, USA 2 Source: MacKay & Co., and Wards Auto Group, a division of Penton Media, Inc.; 2) Westport

17 Source: American Clean Skies Foundation’s (2013); Driving On Natural Gas ~ Approx. 1.6 Billion Gallons/ Year* *Assumes on average each heavy truck would fuel 65 gallons of natural gas 21 days per month and each medium truck would fuel 35 gallons of natural gas 21 days per month. ~ Approx. 930 Million Gallons/Year*

18 Source: Annual Energy Outlook (2013); EIA Assumptions: Fleet Passenger Vehicle Residential Passenger VehicleFleet Light Truck Residential Light TruckMedium TrucksHeavy Trucks Assumed Volume Assumed Days/Month10 21

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20 *Source: American Clean Skies Foundation’s (2013); Driving On Natural Gas, Figure 15 Vehicle Fuel Component

21 * Assumes that 1 GGE of CNG contains 125,000 Btu; ** Numbers reflect average Questar Fueling Station CNG Price per GGE Gas Commodity Cost per GGE