1. Oklahoma Independent Petroleum Association 2007 Annual Meeting Las Colinas, Texas June 8-12, 2007

2. David Scharf Vice President, Commercial ONEOK Partners Gathering and Processing

3. 3 Forward Looking Statement Statements contained in this presentation that include company expectations or predictions of the future are forward-looking statements intended to be covered by the safe harbor provisions of the Securities Act of 1933 and the Securities Exchange Act of 1934. It is important to note that the actual results of company earnings could differ materially from those projected in any forward-looking statements. For additional information, refer to ONEOK’s and ONEOK Partners’ Securities and Exchange Commission filings.

4. 4 444 A Structural Change January 2006 ONEOK Distribution Energy Services Gathering & Processing Pipelines & Storage Natural Gas Liquids Northern Border Partners 82.5% of GP 500,000 units April 2006 DistributionEnergy Services ONEOK Partners 100% of GP 37 million units Northern Border Partners 70% of Northern Border Pipeline Gathering & Processing Interstate Pipelines 50% of Northern Border Pipeline Gathering & Processing Pipelines & Storage ONEOK ONEOK Partners Interstate Pipelines Natural Gas Liquids

5. 5 ONEOK Partners Today

6. 6 666 OKS Gathering & Processing Key Points Asset diversity with balance among basins, producers and contracts Growth opportunities in Mid-Continent and Rocky Mountains – Well connects (725 in 2006) – Internal projects – Strategic acquisitions Basin diversity effective in offsetting natural production declines Commodity and spread risk mitigated significantly

7. 7 Western Oklahoma “WOK” “Super-system” concept Integrated gathering system Integrated gathering system Multiple processing plantsMultiple processing plants Capacity available where and when needed Capacity available where and when needed Efficient operations Efficient operations

8. 8 888 ONEOK Partners Internal Growth -- Grasslands Expansion $30 million expansion Increase processing capacity to 100 MMcfd Increase fractionation capacity to 10 Mbpd Keep pace with growth Completed in phases – Summer of 2007 – First quarter 2008 Part of $90 million in gathering and processing growth projects

9. 9 999 ONEOK Partners Internal Growth -- Arbuckle Pipeline $260 million Marks another major expansion into one of the most active drilling areas in the U.S. 160,000 bpd of raw NGL capacity 440-mile, 12-16-inch line Finalizing dedicated supply commitments from a number of NGL producers – NGL basins in Oklahoma – Barnett Shale in Texas Capability to deliver to Gulf Coast fractionators Completion in early 2009

10. 10 ONEOK Today