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New guidance on estimating emissions uncertainty

Addressing Uncertainty

IPIECA and the American Petroleum Institute (API) jointly published a new guidance document on greenhouse (GHG) gas technical considerations and calculation methods entitled Addressing uncertainty in oil and natural gas industry greenhouse gas inventories. The document has been issued in two parts – the main summary guidance and detailed technical appendices.

The guidance offers a summary of technical considerations that are important for understanding and calculating GHG emission inventory uncertainty. Technical considerations and statistical calculation examples are included to provide technically sound approaches for assessing uncertainty in different situations.

This document aims to assist oil and gas companies by providing a practical and easy to implement approach for a range of applications, starting with establishing a corporate carbon footprint, publicly reporting on GHG emissions and assessing lifecycle emissions.

Building on a 2007 IPIECA/API workshop where the need to develop an understanding of the importance of the key factors that contribute to uncertainty was established, a pilot version was subsequently published in 2009 to allow for a broad review and implementation of guidance from various stakeholders. The comments received, lessons learned and new developments that have occurred in the area since then are incorporated in this document.

This document is a companion to the API Compendium of Greenhouse Gas Emissions Methodologies for the Oil and Natural Gas Industry (API, 2009).

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