With increased scrutiny of greenhouse gas (GHG) emissions from the
consumption of fossil fuels, there is a growing realization that the
consumption of natural gas, including its use as a fuel for electricity
generation, is set to rise. Growing global need for liquefied natural
gas (LNG) to supplement regional natural gas supplies will lead to
increased levels of activities to liquefy, ship, store and regasify LNG
for its ultimate use. LNG – as a clean energy alternative – will play an
increasingly important role in helping nations improve their air
quality and ensure a secure and diverse energy supply in the coming
This document is designed to provide guidance for the quantification of
GHG emissions associated with operations along the LNG value chain, i.e.
liquefaction; shipping; loading/unloading; regasification; and storage.
The guidance provided includes:
Mapping out of the GHG emission sources associated with the LNG operations chain;Compilation and description of relevant methods for estimating
GHG emissions including generic emission factors that may be useful when
site specific information is lacking. The main GHGs considered in this document are CO2 that is primarily
associated with process heat and combustion emissions, and CH4 that is
primarily associated with venting, leakage and fugitive emissions.