Oklahoma Independent Petroleum Association

2007 Annual Meeting

Las Colinas, Texas

June 8-12, 2007

David Scharf

Vice President, Commercial

ONEOK Partners Gathering and Processing

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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.

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A Structural ChangeJanuary 2006

ONEOKDistribution

Energy Services

Gathering & Processing

Pipelines & Storage

Natural Gas Liquids

Northern Border Partners• 82.5% of GP • 500,000 units

April 2006

Distribution Energy Services

ONEOK Partners• 100% of GP• 37 million units

Northern Border Partners70% of Northern Border

PipelineGathering & Processing

Interstate Pipelines

50% of Northern Border Pipeline

Gathering & Processing

Pipelines & Storage

ONEOK ONEOK Partners

Interstate Pipelines

Natural Gas Liquids

5

ONEOK Partners Today

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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

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Western Oklahoma “WOK”

““Super-system” conceptSuper-system” concept• Integrated gathering Integrated gathering systemsystem

•Multiple processing Multiple processing plantsplants

• Capacity available Capacity available where and when neededwhere and when needed

• Efficient operationsEfficient operations

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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

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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

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ONEOK Today