Greenhouse gases (GHG) have been identified as the most significant contributor to climate change over the past decades. Key GHG include carbon dioxide (CO2), methane and nitrous oxides. Among these gases, CO2 is by far the most prevalent and the major contributor to current world GHG emissions . CO2 is released as a result of various chemical reactions, in particular the burning of fossil fuels for energy generation and transport.
HRC acknowledges the urgency for global efforts in mitigating climate change issues as well as environmental protection. Hence, we are committed to managing our GHG emissions by improving energy efficiency and integrating GHG emissions management into our business activities. Furthermore, we maintain and report emission inventories, undertake projects to manage operating emissions, and apply innovative technologies to improve the energy efficiency of our operations.
As a start, HRC applies the methodology outlined in API Compendium of Greenhouse Gas Emission Methodologies for the Oil and Natural Gas Industry 2009, ISO 14064-1 to calculate our GHG emissions. Direct GHG emissions from stationary combustions, flaring, process and fugitive emissions together with indirect emissions arising from use of imported electricity are monitored. Indirect emissions (SOX & VOC) from use of imported electricity are also measured as CO2 equivalent emissions.
Energy use and energy efficiency are actively monitored. The industry standard, Solomon Associates Energy Intensity Index (EII), has been, and is used to measure and rank our refinery energy efficiency. It is a matrix that is referred to when seeking to maximize operational process energy efficiency for existing and potential new projects. An EII target is set annually and it is monitored regularly to ensure high overall energy utilizations, minimum use of fuel oil for power generation and drive EII reducing energy tactics. The overall aim is to reduce our CO2 emissions and improve energy efficiency over time.
GHG emission performance
Our GHG emissions in 2017 were the highest since 2012, being a 7% increase compared to the baseline year 2007 (1,196,250 tonnes CO2-eq), and 2.8% increase compared to 2016 (1,243,670 tonnes CO2-eq). This increase in GHG emissions was due to a 6% increase in refinery throughput in 2017 as compared with 2007 and 7% increase as compared with 2016. Nevertheless, our GHG emissions per million barrels produced showed a 2.9% improvement in carbon efficiency from 2016, at 32,206.2 tonnes CO2-eq./mln bbl in 2017.
In 2017, our energy efficiency performance was the best in the past 5 years, with an EII of 111.5, representing a 2.2% improvement compared to 2016 and a 12.4% improvement compared to 2012. We were well within the targeted energy consumption value. This was achieved by operating the refinery more efficiently and executing several energy improvement tactics, such as improving the refinery’s power generation efficiency.