--Plains offers SemGroup shareholders $1 billion after SemGroup board rejects offer

--Offer is latest in a spate of pipeline company consolidation attempts

--Plains says it has pursued SemGroup for several years

Updates with details throughout)

By Ben Lefebvre

Plains All American Pipeline LP (PAA) on Monday said it's pursuing a $1-billion hostile takeover of SemGroup Corp. (SEMG) after repeated rejections, in the midst of a consolidation spurt raging through the pipeline industry.

As new drilling technology has unlocked new supplies of oil and natural gas throughout the U.S., reshaping the geography of energy production and transportation, pipeline companies are being forced to expand the reach of their systems.

KinderMorgan Inc. (KMI) last week announced it would pay $21.1 billion for natural gas pipeline operator El Paso Corp. (EP), while Southern Union Co. (SUG) shareholders are preparing to vote whether to approve a $5.7-billion bid from Energy Transfer Equity L.P. (ETE) made over the summer.

Plains said it had made multiple offers for SemGroup in the past several years, the latest being on Oct. 6 for $24 a share cash, a 16% premium over SemGroup's 10-day average closing price as of Oct. 5.

Plains, based in Houston, controls about 16,000 miles of crude oil and refined fuel pipelines stretching from western Canada to West Texas and the Gulf of Mexico.

"We are disappointed that SemGroup's board of directors has refused to engage in constructive discussions with us regarding a possible transaction," Chairman and Chief Executive Greg L. Armstrong said in a letter to SemGroup. Plains said it started bidding for SemGroup in March 2010 with a proposal of $17 a share.

Plains said it was making its latest letter to SemGroup public to inform stockholders and other stakeholders of the proposal and its commitment to completing a transaction.

Based in Tulsa, Okla., SemGroup operates 2,400 miles of crude oil, natural gas, refined fuels and natural gas liquids pipelines stretching from Canada to South Texas and Mexico. It also controls oil storage terminals totaling 18.4 million barrels a day. The company, which emerged from bankruptcy in late 2009, posted a second-quarter net loss of $12.3 million on revenue of $344.2 million.

According to SemGroup's most recently quarterly filing, it had 41.7 million shares of Class A and Class B stock outstanding.

A message seeking comment from SemGroup wasn't returned immediately.

Shares in SemGroup were up 19.4% at $28.12 premarket, above Plains's offer price, while Plains shares were up 0.8% to $64.38.

-By Ben Lefebvre, Dow Jones Newswires; 713-547-9201; ben.lefebvre@dowjones.com

-Joan E. Solsman contributed to this article

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