By Alison Sider 

Low oil-and-gas prices are poised to shake up yet another part of the nation's energy economy, spurring a merger battle among companies that own the key pipelines that move fuels around the country.

Williams Cos., a large natural-gas pipeline operator, said it hired bankers and lawyers to help it review strategic alternatives, including a sale, after rejecting a roughly $48 billion unsolicited takeover that would have been the largest energy deal in the U.S. this year.

Shares in the Tulsa, Okla., company soared to an all-time high of $60.86, up 26%, giving the more than 100-year-old company a market valuation of $45.58 billion. Shares of its would-be buyer fell nearly 5% to $65.06.

Cheap energy has stronger companies across the industry--including exploration and drilling companies--eyeing weaker rivals. But deals have been few as buyout candidates hold out for richer offers. Dallas-based pipeline company Energy Transfer Equity LP. said it has been pursuing Williams for six months.

And it isn't giving up, saying the proposed all-stock deal would be "the right merger at the right time." Other pipeline giants also may enter the Williams bidding, said analysts.

Other companies that run major pipelines may also be merger candidates, analysts say, including Oneok Inc., another Tulsa company that owns a skein of natural-gas lines and is building a big new one to Mexico. Regional specialists may also be acquisition targets, according to Credit Suisse, which named Targa Resources Corp., a large pipeline operator in West Texas. Oneok declined to comment. Targa didn't respond to requests for comment.

Crucial to the U.S. energy industry, pipelines are generally considered the safe and boring end of the business; their operators make money charging fees to move oil, natural gas and other fuels around the country. Though there are several massive operators, including Kinder Morgan Inc. of Houston and TransCanada Corp. of Calgary, the business remains fragmented.

Pipeline operators have been less affected by low oil and gas prices than the companies that explore and drill for energy. But building pipelines has become difficult in many parts of the U.S., in part because of the kind of political pushback that has stalled the Keystone oil pipeline from Canada.

Complicating the situation has been the decision of many pipeline companies, including both Energy Transfer and Williams, to embrace a partnership structure and promise to distribute increasing cash payments to investors. That puts added pressure on them to buy assets or rivals as a way to grow.

Williams, which has roots going back to 1908, owns one of the most critical fuel links from Texas to New York and New Jersey, the 10,000-mile Transco natural-gas network. The company also is building a line that will move natural gas from the Marcellus Shale in Pennsylvania to New York and New England.

Though little known outside of the energy patch, Energy Transfer has become one of top oil and gas transportation companies in the U.S. under the guidance of a trained engineer and music producer named Kelcy Warren. He started Energy Transfer in 1995 with less than 200 miles of natural gas pipelines in Texas; today the company controls an intricate network of 70,000 miles of oil, gas and fuel lines.

Geographically, a deal with Williams would give Energy Transfer an expanded footprint. Williams has significant fuel-moving capabilities in the northeastern U.S., while most of Energy Transfer's pipelines are located across the south and Midwest. Since there is little overlap between their networks, Bank of America analysts said the two companies could combine without having to do much to placate antitrust regulators.

Williams and Energy Transfer already have a contentious history. In 2011, Energy Transfer agreed to buy pipeline operator Southern Union Co. for $4.2 billion when Williams swooped in and offered $4.9 billion. Ultimately Energy Transfer paid $5.7 billion to win the deal.

The recent plunge in oil and other fuel prices has been akin to blood in the water for Mr. Warren, who told investors last February that he had a big appetite for energy deals this year.

"This is going to sound odd to you, almost sadistic, but I was disappointed to see a rebound in crude prices," he said earlier this year on a conference call with analysts and shareholders as U.S. oil prices were rising from $50 to $60 a barrel. "I was excited to see who might be more vulnerable if we saw this market continue a downward trend and stay there a bit longer."

Behind the scenes, Mr. Warren was already pursuing Williams, which has had financial problems. The company, which purchased the Transco pipeline in 1995, was struggling under $15 billion in debt in 2002 when it was aided by a $2 billion investment from its banks and Warren Buffett's Berkshire Hathaway Inc.

More recently, Williams capitulated to two activist hedge funds, Corvex Management LP and Soroban Capital Partners LLC, last year giving them seats on the board. At the time, the funds said financial missteps had hamstrung Williams, and encouraged the company to consider a sale. On Monday the funds declined to comment.

A deal would end Williams's plan to buy its subsidiary Williams Partners for $13.8 billion. While at least one person involved in that transaction said there had been no discussion of it as a defensive measure, that deal prompted Energy Transfer to offer the board $64 a share in stock on the condition that it jettison the planned purchase.

Darren Horowitz, a Raymond James analyst, agreed with Williams that the offer was too low. "I don't think that this offer truly reflects the long term intrinsic value of Williams," he said.

But few expect Energy Transfer to give up. Ethan Bellamy, an analyst with Robert W. Baird & Co., said Mr. Warren has been pushing to build the company on a grand scale: "His vision is to win and make money, make no mistake about that."

Erin Ailworth contributed to this article.

Write to Alison Sider at alison.sider@wsj.com and Dana Cimilluca at dana.cimilluca@wsj.com

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