By Ted Mann and Géraldine Amiel 

General Electric Co. is in talks to buy Alstom SA's energy business, people familiar with the matter said, a move that would beef up GE's power-generation unit and tilt the conglomerate's earnings more heavily toward industrial operations.

GE Chief Executive Jeff Immelt is under pressure to boost earnings from areas such as jet engines, medical devices and power plants to reduce the company's reliance on its finance arm. A deal for the French engineering company's power-generation and transmission-grid assets would do that at a stroke.

Alstom's energy operations generated about $14 billion between April and December, 71% of the company's total revenue. The operations would complement GE's power-and-water business, which accounted for $24.7 billion of the U.S.-based company's $146 billion in revenue last year.

A deal likely would be one of GE's largest in a decade. It would instantly give the company new power-turbine business in emerging markets and Europe and provide an entree to the transmission-equipment market, where GE lacks a strong presence.

But GE would be absorbing the bulk of a company that has been struggling against weakening emerging markets, slack economic growth in Europe and cutbacks in capital spending by European utilities.

A deal likely would cost GE much more than the $1 billion to $4 billion that the company has said it prefers for acquisitions. But Mr. Immelt last week said he would be willing to pay more if he could find good values.

Alstom said Thursday that it wasn't aware of a potential public bid for its shares and that it continuously reviews its strategic options.

A weak outlook had driven Alstom's shares to a nine-year low earlier this year. Alstom's shares closed 11% higher in Paris on Thursday. GE's shares rose four cents to close at $26.46 on the New York Stock Exchange.

French newspaper Le Figaro reported Thursday that the companies were in talks over the energy business.

A GE acquisition of Alstom's energy operations likely would face antitrust scrutiny by the European Union and at national levels in Europe. The companies compete head-on in many European markets over energy turbines or renewable-energy production. Combining their energy assets would create one of the largest players in the European power-generation business.

"Even though GE and Alstom are, to a certain extent, complementary to each other, there will be an overlap in a number of markets," said Marco Slotboom, an antitrust lawyer with VVGB in Brussels. "Competition authorities will therefore want to scrutinize the deal and would like to know whether customers will have sufficient choice of supply following the transaction."

A deal could also face hurdles with the French government. President François Hollande has signaled his openness to foreign investment as he seeks to revitalize his country's tepid economy. But Alstom, known for its TGV superfast train, long has been considered a strategic asset in France. A deal would leave the company much smaller, focused on commuter trains and rail infrastructure.

Also, Alstom last month said it was cooperating with the U.S. Justice Department on an investigation into possible improper conduct, though the company didn't provide details.

GE is the world's dominant maker of gas turbines. The company commanded roughly 42% of the market in 2012, with Germany's Siemens AG at 27%, according to a Citigroup analysis citing McCoy Power Reports. Alstom was a distant fourth, at 4%.

But Alstom is second to Siemens among Western companies in the market for coal-fueled turbines for power plants. That would give GE a product to sell in markets that aren't ready to buy its higher-price gas turbines.

Alstom generates about one-third of its sales in Western Europe, which would give GE a bigger installed base of power equipment from which it can reap service and repair business, according to Bernstein Research.

Sales at Alstom's energy operation shrank in the first nine months of its fiscal year, which ran through March, as orders fell sharply in its grid and conventional-power businesses.

CEO Patrick Kron in November unveiled a plan to slash about $2 billion in costs, in part through job cuts, and has planned to raise cash by selling a minority stake in its flagship train business and other assets.

GE's interest might have been piqued by the difference between the companies' operating margins: 6% for Alstom and 16% for GE's industrial operations, said Deane Dray, an analyst with Citigroup. Running Alstom's operations more efficiently could make the deal pay off.

"It becomes a very interesting cost-takeout and rationalization project, " he said. "That's one of the things GE's good at."

Buying the French company also would give GE a chance to deploy some of its overseas cash, which as of Dec. 31 had swelled to $57 billion, more than half the company's total of $88.6 billion. GE would owe U.S. income taxes on any overseas funds returned to the country to pay dividends or buy back stock. U.S. companies can use their overseas cash to buy foreign businesses without taking a tax hit, making such transactions more appealing.

Kate Linebaugh in New York and Inti Landauro in Paris contributed to this article.

Write to Ted Mann at ted.mann@wsj.com

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