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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr for the latest information on EPA's New Source Review program.

December 29, 1989 Use of Netting Credits 4.44

Emissions decreases that are not fully utilized in allowing a source to net out of review do not result in "leftover" emissions credits that could be used in any future netting transactions. All contemporaneous and creditable emissions changes used to net out of review remain fully available and must be included in subsequent netting transactions at the source unless they occur before the contemporaneous time period of the subsequent modification under consideration or they are "relied upon" in issuing a major source permit. The memo provides an example of a netting calculus.

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