"A 5% margin on the business is the sort of margin we require" to make investments in new sources of energy, he added.

BBC: British Gas profits boosted by colder weather

Aubrey McClendon was forced to sell a gigantic stake in his company Chesapeake Energy because of margin calls.

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But inflation should then drop back, as the contribution from retail energy prices wanes and the margin of spare capacity in the economy increases.

BBC: Central banks' official statements

"A critical portion of our energy industry is operating with no margin for error, "U.S. Rep.John Shadegg, R-Ariz.

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The Waxman-Markey bill that passed the House on Friday by a 219-212 margin will punitively tax energy sources that contribute 90% of current U.S. electricity (or 71% if you want to leave out nuclear).

FORBES: Waxman-Markey Flunks Math

On June 26 the House passed the 1, 300-page American Clean Energy and Security Act of 2009 by a hair's margin (219 to 212).

FORBES: Magazine Article