By Amy Guthrie 
 

MEXICO CITY--The Mexican unit of Sempra Energy (SRE) raised $521 million via an initial public offering on the Mexican Stock Exchange Thursday, a source with direct knowledge of the deal told Dow Jones Newswires.

The 189.7 million shares priced at 34 pesos ($2.74) each, at the high end of the proposed MXN30-MXN34 range, the source said, amid exceptionally strong demand both in and outside Mexico. Including an overallotment option that is expected to be exercised, Sempra Mexico would have raised around $600 million.

Investors were eager to buy shares in "the first public company with pure energy exposure to Mexico," the source said. Excitement was also fueled by expectations for Mexico to open up to greater private sector energy investment, as well as recent contract wins by Sempra Mexico, the source added. Investors can currently buy bonds issued by Mexico's state-owned energy firms, but no shares are on offer.

Sempra announced plans in October to build a $1 billion natural-gas pipeline for Mexico's state-owned utility that will connect pipelines in Arizona with power plants in western Mexico.

Some of Mexico's largest pension funds bought into the Sempra Mexico deal, as did Mexican retail investors and large institutional funds. Dedicated emerging markets and Latin America funds participated, while global funds that specialize in infrastructure and energy also took part.

The Mexican units of Citigroup, BBVA, Credit Suisse and Deutsche Bank led the deal.

In Mexico, San Diego, Ca.-based Sempra owns a natural-gas import terminal in Baja California, a network of gas pipelines and a gas utility, among other assets.

Sempra said it plans to use most of the proceeds from Thursday's offering for general corporate purposes in Mexico.

The company's Mexican unit has been renamed Infraestructura Energetica Nova, or IEnova. Sempra sold about 19% of the Mexican unit via the IPO.

Mexican Stock Exchange Chief Executive Luis Tellez said earlier Thursday that IEnova would be the last IPO during a busy quarter of offerings on the local exchange.

In addition to pent up investment demand in Mexico's huge energy sector, which is dominated by state-controlled firms such as Petroleos Mexicanos, Mr. Tellez noted that investors in general are optimistic about Mexico's economic prospects.

--Cassandra Sweet and Saabira Chaudhuri contributed to this story

Write to Amy Guthrie at amy.guthrie@dowjones.com

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