Previously battered energy company stocks continued to participate in the general stock market upturn, with some of those that have seen the largest losses — Calpine, AES, Mirant and Williams — now recording the greatest percentage gains. Energy companies were almost uniformly in the black, from large producers and independents through marketers, pipelines and power producers. Pure electric and gas utilities showed a few stock price losses, but those were scattered.

Calpine’s share price was up 18.80% to $10.87. AES was up 7.56% to $6.40. Mirant rose 9.99% to $12.00, and Williams was up 6.18% to $20.28.

EOG Resources (up 5.68% to $37.95), Devon Energy (up 4.71% to $46.70), and Anadarko Petroleum (up 4.22% to $54.88) led large independent producers, which generally showed gains of 1-3%. Major integrated producers tended to move in a pack, with share prices up between 1.5 and 2.5%.

Besides the Williams gain, pipelines also traded evenly up 1-3%, except for midstream and liquids operator Western Gas Resources, which jumped 7.20% to $35.27.

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