Article: United States : TEXT-Moodys upgrades Occidental Petroleum.

Byline: manish03

Billionaire Warren Buffett's Berkshire Hathaway Inc. took a stake in NRG Energy Inc., the second-biggest power producer in Texas. Buffett also made an undisclosed transaction involving ConocoPhillips, the second- largest U.S. refiner.

Berkshire had 3.24 million NRG shares as of June 30, the Omaha, Nebraska-based company said today in a regulatory filing disclosing equity investments at the end of the second quarter.

``It would be logical for him to increase his utility and energy holdings and NRG would fit in nicely,'' said Frank Betz, a partner at Warren, New Jersey-based Carret Zane Capital Management, which oversees $800 ...

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