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[quote user="Euclid"]Well wouldn't the upgrades be necessary to keep the cost as low as possible? Why would they spend money on upgrades that were not needed? What other need could there be except to lower hold down costs that rise as equipment becomes obsolete. Upgrades may cause higher rates, but not as high as they would rise without the upgrade. The incentive to save costs is either to avoid upgrading that is not necessary or to upgrade to a more cost-efficient production.[/quote] 1) You haven't answered my questions 2) The discussed upgrades would be necessary to comply with clean air regulations to comply emission standards. And the Sierra Club shows the approving authorities that there are more economic alternatives to upgrading a coal power plant. 3)Exchange of worn out equipment might fall in the second category if you have to rebuild the complete plant, otherwise exchange of single machinery we call maintenance not upgrade. But that might be different in the USA. Regards, Volker
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