More monitoring options can expand operational choice without making every result equivalent. EPA's November 30, 2016 oil-and-gas equipment-leak rule permitted Method 21 with a 500 ppmv leak definition as an alternative to the specified optical gas imaging method. Crucially, the agency also finalized separate leaker factors for that alternative. The calculation followed the method, not simply the operator's preferred number. [2016-27981]

That design had roots in the January 29 proposal, which connected additional reporting methods to leak-detection approaches in then-proposed new-source performance standards. It proposed corresponding emission factors and reporting changes. By November, EPA was aligning with finalized standards. The two documents show coordinated regulatory design; they do not provide independent estimates of what different operators would spend on implementation. [2016-01669][2016-27981]

The mechanism is narrower than a general deregulation claim. An alternative detection route can change a facility's options, but the 500 ppmv definition is method-specific and is not a universal safety limit. Appropriate factors remain necessary to calculate reported emissions. The final rule also addressed nine new or substantially revised data elements, so a choice of monitoring technique did not eliminate the information obligation. [2016-27981]

Subpart W did not itself require repairs, although other rules could impose them. Its final amendments specified January 1, 2017 effectiveness. For market analysis, the unresolved issue is whether the added choice reduces compliance effort while retaining useful emissions accounting. The retained documents establish the option and its constraints, not realized savings, competitive gains or a measured reduction in environmental costs. [2016-27981]

Source documents

  1. Greenhouse Gas Reporting Rule: Leak Detection Methodology Revisions and Confidentiality Determinations for Petroleum and Natural Gas Systemshttps://www.govinfo.gov/content/pkg/FR-2016-11-30/html/2016-27981.htm
  2. Greenhouse Gas Reporting Rule: Leak Detection Methodology Revisions and Confidentiality Determinations for Petroleum and Natural Gas Systemshttps://www.govinfo.gov/content/pkg/FR-2016-01-29/html/2016-01669.htm