Environmental Responsibility

To achieve the company’s mission in conducting business with social and enviornmental responsibilities, GPSC is committed to controlling, preventing, and mitigating environmental impacts from all sources to create sustainable eco-efficiency by setting policy and approach for environmental responsibilities as follows:

Quality, Security, Health and Environmental Policy for GPSC Group

GPSC recognizes that, without appropriate control, electricity and steam production processes may affect public health and wellbeing as well as the environment. Therefore, GPSC has issued the GPSC Group Quality, Security, Health and Environmental Policy to enhance the effectiveness of our control of these processes and ensure continuous progress toward excellence. The policy serves to gain acceptance by all stakeholders as a key step in creating an efficient and sustainable power and utility business.

Download Quality, Security, Health and Environmental Policy


Environmental Responsibility Management Approach

Air Pollution

Nitrogen oxide (NOx) gases are essential pollutants from the process of generating power using natural gas. Without appropriate control, these gases can affect the human respiratory system and cause environmental pollution, such as acid rain. Therefore, GPSC focuses on effective control and assessment of air pollution from sources by implementing the following approach:

  • Improve production efficiency and create an implementation plan to reduce air pollutant emissions continuously by adopting the Low NOx Burner technology which reduces the level of nitrogen oxide gases generated in the combustion chambers of gas turbines. Moreover, the company has also adopted the Selective Catalytic Reduction (SCR) technology which uses ammonium hydroxide solution to trap nitrogen oxide gases from combustion. With a catalyst, ammonium hydroxide solution forms an oxidation reaction with nitrogen oxide gases which are then converted into nitrogen gas (N2) and water (H2O).
  • Monitor and assess the level of air pollutant emissions by installing Continuous Emission Monitoring Systems (CEMS) in ventilation areas.
  • Measure air quality in the areas inside and outside operational sites according to the legal requirements.
  • Create buffer zones around operational sites to prevent air pollution from spreading outside.


GPSC is committed to minimizing waste from the production process which reflects the production efficiency in order to reduce environmental impacts and lower waste treatment expenses. Therefore, the company exercises strict adherence to the 3Rs principle (Reduce, Reuse, Recycle) by minimizing waste from all waste origination sources and reusing or recycling any waste, resulting in a continuous decline in waste landfill volume and move toward the ultimate goal of reaching the zero landfill target.

Water Management

  • External Water Management

GPSC joins forces with the PTT Group Water Management Team to manage water externally. The team conducts monthly meetings to analyze the latest reports on the water situation based on surveys and water scenario analysis as well as formulating water management and monitoring plans. Following the meetings, the responsible business units are informed of the water situation and directed to carry out the implementation according to the formulated plan.

Moreover, the PTT Group Water Management Team also collaborates with the Eastern Region Water Management Team in Rayong, comprised of government agencies, Eastern Water Resources Development and Management PLC. (East Water), and representatives from the private sector, to monitor, assess, and analyze the water situation and set timely risk mitigation measures.

  • Internal Water Management

GPSC is committed to managing water usage internally by optimizing the usage of water shared with local communities by following the 3Rs (Reduce, Reuse, Recycle) principle for efficient internal water management. Examples of GPSC’s 3Rs approach to enhanced internal water usage efficiency include reducing water usage in the power production process, reusing waste water from the cooling system to cool the waste water from boilers, and recycling condensate water in the steam production process.

Moreover, the company regularly assesses the quality of the water released back into the environment to ensure that the quality of all water after it has been used in the company’s operations is safe for local communities and meets the required legal standards.

Environmental Management and Environmental Impact Assessment Report

Environmental management at GPSC follows the company’s Quality, Security, Health and Environmental Policy to ensure not only that continuous improvements are made in environmental implementation but also that stakeholders’ expectations are met in a sustainable manner. The comprehensive coverage of the environmental management direction set by the company applies to all business units along the value chain and throughout the operational process, from planning and design, through to implementation and right up until project completion. The company adopts the following implementation approach:

1. Audits by International Accreditation Bodies

Currently, GPSC’s primary operational plants, which are Central Utility Plant 1, 2, 3 and Sriracha Power Plant, have all been granted certification in the following international standards: standards of quality management system (ISO 9001), standards of environmental management system (ISO 14001), standards of occupational health and safety management system (OHSAS 18001), and standards of integrated management system (IMS).

GPSC recognizes the importance of environmentally friendly operations for sustainable development and, therefore, strives to achieve the continuous and sustainable development and improvement of production processes as well as environmental management on the basis of social responsibility throughout the value chain, both inside and outside of the organization. This concrete commitment results in all the main operational sites of GPSC earning the Eco Factory certification from the Industrial Environmental Institute, the Federation of Thai Industries.

All GPSC’s operational sites and projects have undergone environmental impact assessments prior to the commencement of the projects in accordance with legal requirements. The environmental impact assessment employs rigorous forecasting methodologies that consider both the positive and negative potential impacts from a given project on the environment and community. The primary objective is to ensure that any potential impacts from the project have been thoroughly considered right from the planning and decision-making process for every relevant aspect of project implementation. Moreover, the company has also implemented additional prevention and impact mitigation measures specified in the environmental impact assessment report to enhance effectiveness. The content of the environmental impact assessment report includes the monitoring of environmental quality, such as air quality, noise levels, water quality, and the occupational health and safety of employees. More information on GPSC’s Environmental Impact Assessment reports

can be found at

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GPSC has systematically and effectively communicated environmental issues with stakeholders in accordance with the Quality, Security, Safety, Health and Environmental Communication Handbook.

GPSC undertakes systematic monitoring and investigation of sub-standard acts or situations, near miss incidents, accidents, or abnormal circumstances with an explicit management approach for the reporting of incidents, the identification of underlying causes or shortcomings, the planning of corrective action, and continuous monitoring.

GPSC integrates environmental management as part of its corporate culture with the goal of raising employee awareness and ensuring strict adherence to the company’s protocol in environmental management. The company regularly shares information or lessons learned on environmental management in supervisor meetings at each plant as well as communicating environmental management issues internally through intranet systems and on-site bulletin boards.