1. Overland Pass Pipeline January 2008

2. 2 About ONEOK/ONEOK Partners ONEOK is general partner and 45.7 percent owner of ONEOK Partners ONEOK was founded in 1906 as a natural gas pipeline from Tulsa to Oklahoma City Fortune 500 company –Most admired energy company ONEOK: One of largest natural gas distributors in U.S. ONEOK Partners: leader in natural gas and natural gas liquids Values: Operate in a safe and environmentally responsible manner Legacy of community involvement

3. 3 Project Summary Approximately a 760-mile transmission pipeline Originates in Opal, Wyo., and ends at Conway, Kan. Traverses 23 counties in 3 states 90 percent of route follows existing utility corridors Transports natural gas liquids (NGLs) Approximate $433 million capital investment 14- and 16-inch diameter pipe (varies) Buried minimum of 3 feet below ground Startup pipe capacity range: 110,000-150,000 barrels per day

4. 4 Local Economic Impacts WYCOKS Miles of pipe327172261 Annual tax revenue$2.2 million$2.6 million$3.6 million Capital investment$215 million$98 million$145 million Construction payroll$17.6 million$10.4 million$15.3 million

5. 5 Landowners by state Properties crossed: –Wyoming – 134 landowners; –Colorado – 251 landowners; –Kansas – 667 landowners.

6. 6 Construction Progress as of Dec. 31, 2007 SpreadWorkforceWork DaysWelds 1 4585138.6 2 3357055.8 3 2157964.6 4 1687145.8 5 2027065.2 TOTAL1378341270

7. 7 Looking east toward Arlington Ridge - Wyoming

8. 8 Overall Progress (Welding)

9. 9 Key Accomplishments as of Dec. 31, 2007 –Major River Crossings Completed Blacks Fork - 2 Crossings Green River Medicine Bow North Platte –Other Major Crossings I-80 I-25 Cheyenne Hub & Hwy 85 –Completed Data Recovery at WY Arch sites and received NTP for those sites –Completed 66 of 124 miles of BGWR area –Construction production on a good week is in excess of 35 miles

10. 10 Blacks Fork River Crossing

11. 11 Green River Crossing

12. 12 North Platte River Crossing

13. 13 Key Concerns –BGWR variances denied beginning Dec 1 –No BGWR variances in effect after Dec 15 –Unless we work something out with BLM the BGWR areas are closed to construction activity until 5/1/2008.

14. 14 Rawlins Wood Water Pipe

15. 15 Piceance

16. 16 For More Information Visit www.overlandpass.com or (877) 683-7277 –Latest updates about the project –Links to educational documents about the Natural Gas Industry ONEOK Partners contacts: –Steve Johnson, (913) 319-8604, (785) 865-6130 or sjohnson@oneok.com –Megan Washbourne, (918) 588-7572 or mwashbourne@oneok.com