A decade of sectoral initiative to promote consistent and reliable quantification of greenhouse gas emissions
With the increased focus on greenhouse gas emissions (GHG) and their role in the implementation of policy measures for their mitigation, there continues to be a need for accurate, reliable and transparent characterisation of these emissions. A myriad of mandatory reporting regulations and voluntary initiatives with diverse protocols and methodologies are emerging globally. This poses a particular challenge to multinational companies, such as in the oil and natural gas industry sector, which operate globally and in joint ventures. The American Petroleum Institute (API) and its member companies recognised these challenges over a decade ago and launched a multi-year initiative to map out and provide tools for the quantification of GHG emissions from oil and natural gas industry operations and similar industrial sources. During this time span, the industry developed several key guidance documents to promote the consistent and accurate quantification and reporting of GHG emissions. This paper will focus on two recent publications: the 2009 Edition of API’s Compendium of GHG Emissions Estimation Methodologies for the Oil and Gas Industry (3rd revision); and, a new document addressing technical considerations and statistical calculation methods for assessing the uncertainty of GHG emission estimates. The paper will discuss case studies pertinent to oil and natural gas exploration and production activities and will put these in context with emerging US mandatory GHG emissions reporting. It will also discuss the broad applicability of these estimation methods, and uncertainty considerations, to most industry sectors that rely on fossil fuels for their energy sources.