Operational Eco-Efficiency

IRPC is aware of the impact that may occur to surrounding communities from business operations and realizes its role in using the world’s resources with responsibility. Therefore, IRPC places great importance on the eco-efficiency management throughout the supply chain by using resources and raw materials in the most efficient manner, enhancing energy efficiency, managing air quality, and managing wastewater and waste.

Management Approach

IRPC has a policy for Quality, Security, Safety, Occupational, Health, Environment, and Energy Management (QSSHE), which focuses on:

  • Operational Excellence Management System (OEMS)
  • Systematic risk management planning
  • Compliance with laws and regulations
  • Risk control and mitigation according to 7Rs principle, coupled with guidance under the Green Turnaround concept and circular economy principle

IRPC has established integrated management for energy, air, water, and solid waste under the scope of the Eco Factory, which is implemented into the operation of every plant to generate continued development. The Green Turnaround concept has been adapted into the management approach to reduce impacts during annual shutdown and turnaround. For instance, the operation is conducted in a closed system to manage the volatile organic compounds (VOCs), waste and wastewater, and odor control. Furthermore, in 2020, IRPC has invested over THB 435 million to build systems to prevent or reduce pollutants, conduct environmental quality monitoring, improve environmental management and efficiency to reduce energy use, conserve biodiversity and ecosystems, and lead to a low carbon society.

1. Policy

Operational Efficiency & Management System Roadmap, 2017 – 2022, was initiated to improve IRPC’s operational performance. Furthermore, IRPC commits to reduce environmental impact from its operations by initiating environmental management programs covering energy efficiency, air quality control, and wastewater and waste management, as well as attending and being accredited by the Eco Factory program launched by the Industrial Environment Institute, the Federation of Thai.

2. Management System/ProcessGRI1033,GRI3061(2020),GRI3062(2020)

IRPC adopts the PTT Group’s Operational Excellence Management System (OEMS) to manage  the organization towards operational excellence in every aspect of the operational process, including energy consumption, air quality control, and wastewater and waste management,. To set reduction targets for energy consumption and utilize energy efficiently, IRPC established a long-term management plan setting the organization’s energy consumption target to not exceed 69 million GJ in 2020 and 66 million GJ in 2025. IRPC also has a goal to reduce the Energy Intensity Index (EII) by 89.7% in 2020. In addition, a long-term goal of efficient energy consumption was enhanced to 86.9% by 2025 to obtain top quartile performance in the industry. IRPC recognizes the importance of controlling air quality and odor to prevent impacts on surrounding communities and measures its air quality and odor performance through odor complaints every year. Through continuous development of new technologies to monitor air quality, IRPC places measures to control air pollutants, such as Sulfur Oxide (SOx), Nitrogen Oxide (NOx), and Total Suspended Particles (TSP). Control measures also focus on Volatile Organic Compounds (VOCs) through improving chemical tanks and establishing a VOC inventory record to monitor the emission source. While odor control projects have been implemented through an Elevated Flare and Enclosed Ground Flare (EGF) to lower odor levels and shield surrounding communities from noise and light.

IRPC generates a large portion of hazardous waste for example spent caustic generated from caustic that use to limit contaminate substances in production process at uhv plant and non-hazardous waste like fly ash from coal for generated power from Power plant which needs to be managed accordingly. The generation of waste and improper industrial waste disposal could cause serious impacts to the environment, such as soil and groundwater contamination and visual impact. IRPC is committed to reducing waste from its operation process by applying the 7Rs principles (Reduce, Reuse, Recycle, Repair, Refuse, Return, and Rethink) into the organization’s integrated waste management. IRPC also follows the Zero Waste to Landfill policy established by the PTT Group to lessen impacts on the environment and to create more beneficial use, such as initiating a waste to energy project. IRPC monitors the generated waste volume and disposal regularly. The collection of waste-related data are stored in a database. In addition, IRPC developed the plastic waste platform to collect plastic waste data from the market and integrate it into the IRPC production process to reduce the impact of plastic waste disposal. IRPC also ensures that management of waste by third-party (external/third-party) is in line with relevant regulations.

Furthermore, IRPC manages its wastewater by conforming to governmental regulations and local authorities for water discharge from wastewater treatment. The water management approach was implemented by using the 3Rs principle for effective water usage, such as reusing treated wastewater for watering plants and gardens in central areas within the operating zones.

Development of Environmental Management Accounting System

IRPC has developed a system to integrate expenses, income, and environmental investment under the international standard UN2001 to obtain accurate, adequate, and reliable data. Such data are used in planning, controlling, and making decisions on environmental management for the short- and long-term to enhance environmental management efficiency for routine operations and to reduce both the cost of production and impacts on the environment and society. Phase 1 began operation in March 2020.


3. Performance



GRI StandardDataUnit2017201820192020
N/AAnnual ProductionTon10,748,49912,442,05212,059,75611,886,924



Materials ConsumptionGRI3011 

GRI StandardDataUnit2017201820192020
301-1Crude oilTon8,592,3449,943,3529,383,9059,191,312


Energy Consumption (1) GRI3021 , GRI3023, GRI3024

GRI StandardDataUnit2017201820192020
GRI 302-1 (2016)Total direct energy consumptionGJ52,512,62259,221,32759,072,04757,760,248
Total indirect energy consumptionGJ4,016,1124,502,3444,549,1284,798,143
Total electricity & steam soldGJ4,448,6824,703,2204,901,4305,061,681
Total renewable (wind, solar, biomass, hydroelectric, geothermal, etc.) purchased or generatedGJ00022,406
Total energy consumption (2), (3)GJ52,080,05159,020,45258,719,74557,519,116
GRI 302-3 (2016)Energy intensity (4)GJ/Ton of


(1) Standards and methodologies used to calculate are based on relevant laws and regulations.

(2) Energy intensity not including energy used during major turnaround period in year 2017


Flared and Vented Hydrocarbon (1), (2), (3) G4OG6

GRI StandardDataUnit2017201820192020
G4-OG6Volume of flared hydrocarbon (1), (4)Million M370.0157.4462.6738.89
Volume of continuously flared hydrocarbonMillion M359.6755.3752.8033.24
Volume flared hydrocarbon for oil & gas production in relation to volume producedM3 /Ton of production6.514.615.203.27
Methane Emission of flared hydrocarbonTon90.8374.5281.3050.45


(1) The amount of flared hydrocarbon is calculated accordingly to IRPC’s hydrocarbon management manual, in reference to HM31: Guide to HC Management in Petroleum Refinery Operation and HM32: Guide to Product HC management at Petroleum Product Marketing and Distribution.

(2) Hydrocarbons released from production processes gathered from ACB Data (Calculated HC from the differences of feed to products as stored in SAP) and EPS data (Calculated from Feed going into the reactor in each batch 7.5% and products contain Pentane 6.6% each month)

(3) Hydrocarbons released from storage tanks and product and raw material handling, gathered from Ton VOCs of Tank calculations and Marketing& Terminal as Nm3. All reported in the VOCs Inventory.


 Greenhouse Gas Emission (1) GRI3051, GRI3052, GRI3053, GRI3054

GRI StandardDataUnit2017201820192020
 Operational control
GRI 305-1 (2016)Direct emissions of greenhouse gas (Scope 1) (2), (3)Million tCO2e3.6813.9533.9113.712
GRI 305-2 (2016)Indirect emissions of greenhouse gas (Scope 2) (3)Million tCO2e0.2960.3160.2540.255
GRI 305-1 (2016)Direct & Indirect emissions of greenhouse gas (Scope 1&2)Million tCO2e3.9774.2694.1653.967
Equity Basin (5)
GRI 305-1 (2016)Direct emissions of greenhouse gas (Scope 1)Million tCO2e3.9054.4034.3654.111
GRI 305-2 (2016)Indirect emissions of greenhouse gas (Scope 2) (3)Million tCO2e0.2960.3160.2540.255
GRI 305-4 (2016)GHG Emission Intensity (7)tCO2e/Ton of production0.3700.3430.3450.334


(1) GHG calculations refer to API 2009, IPCC 2006, ISO14064-1, The Greenhouse Gas Protocol: A Corporate Accounting and Reporting Standard (Revised Edition), and GWP refers to the IPCC Fourth Assessment Report (AR4-100 year) from the Group’s subsidiaries include those from IRPC PCL, IRPC Oil Co., Ltd., IRPC Polyol Co., Ltd.,UBE Chemicals Co., Ltd (Asia), and IRPC Clean Power Co., Ltd/

(2) This does not include GHG emissions released from process vents.

(3) GHG Emission from Electricity bought from EGAT is calculated in reference to PDP 2015 Conversion factors calculation.

(4) GHG Emission from Electricity and Steam bought from private Power Plant (Local) is calculated in reference to Allocation of GHG Emission from combined heat and power (CHP) plant Guide to calculation worksheet V.10 (A WRI/WBCSD GHG Protod. Initiative Calculation Tod)

(5) Scope 3 GHG emissions come from employee transportation and use of B5, E10, and E20 inclusion of sales and transport data, electricity loss data (PTT Tool).

(6) GHG emission intensity was calculated from Scope 1 and Scope 2 GHG emissions.


Air Emissions (1) GRI3057

GRI StandardDataUnit2017201820192020
GRI 305-7 (2016)Total NOxTon1,4181,7591,5921,495
NOx IntensityTon/Thousand Tons of production0.1320.1410.1320.126
Total SOx (2), (3)Ton2,1541,5661,8001,377
SOx Intensity (3)Ton/Thousand Tons of production0.1130.1260.1490.116
Total Suspended Particulate (TSP)Ton238270338259
Total VOCsTon2,0152,1071,8971,822
VOCs Intensity (4)Ton/Thousand Tons of production0.1870.1690.1570.153


(1) This comes from direct measurements and relevant standards and regulations.

(2) Sulphur oxide quantities in the form of sulphur dioxide.

(3) SOx Intensity was not included in the calculations of oxide in sulphur during major turnaround.

(4) The SOx and TPS Emission in 2019 increased due to the CFBC Boiler (Power Plant) Operate after the renovation.

(5) VOCs Calculation methodologies for gas flaring were adjusted in reference to US.EPA 2015, and there were also changes in calculations for the storage of raw materials and products.


Water Consumption and DischargeGRI3033,GRI3034 

Water Consumption and Discharge
GRI StandardDataUnit2017201820192020
[Not reported in WEB content]A. Withdrawal: Total municipal water supplies (or from other water utilities)Million cubic meters0.0146000.0151100.0308300.019859
B. Withdrawal: Fresh surface water (lakes, rivers, etc.)Million cubic meters25.28999028.67404027.50586026.629476
C. Withdrawal: Fresh groundwaterMillion cubic meters0.0075900.0083600.0001300.005922
D. Discharge: Water returned to the source of extraction at similar or higher quality as raw water extracted (only applies to B and C)Million cubic meters10.0026009.96013012.89941012.008245
E. Total net fresh water consumption (A+B+C-D)Million cubic meters15.30957018.73737014.63740014.647012


(1) The fresh surface water from natural sources is re-calculated from the receipts issued by Royal Irrigation Department (Khlong Yai River Basin) and rainwater in the reservoirs within IRPC Industrial Zone.


Solid WasteGRI3062(2016), GRI3064(2016),GRI3063(2020),GRI3064(2020),GRI3065(2020)

GRI StandardDataUnit2017201820192020
GRI 306-2 (2020)Total waste disposal (1), (2), (3)Ton54,69155,59851,27541,752
Waste from routine operationsTon54,22255,12951,00941,616
Waste from non-routine operationsTon469469266135
GRI 306-3 (2020)Total waste generatedTon54,69155,59851,27541,752
Hazardous waste generatedTon26,36817,01911,7477,842
Non-Hazardous waste generatedTon28,32338,57939,52933,909
GRI 306-4 (2020)Total waste diverted from disposalTon31,56032,12145,05136,694
Total Hazardous waste diverted from disposalTon8,4473,0567,9465,877
Total Non-hazardous waste diverted from disposalTon23,11329,06537,10530,818
GRI 306-5 (2020)Total waste directed to disposalTon21,59114,1656,2235,057
Total Hazardous waste directed from disposalTon17,92114,0033,8001,966
Total Non-hazardous waste directed from disposalTon3,6701622,4233,092


Waste management information was gathered from service providers certified from the Department of Industrial Works


Oil and Chemical SpillsGRI3063(2016)

GRI StandardDataUnit2017201820192020
306-3 (2016)Significant Oil & Chemical SpillsCase0000
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