GPSC group’s environmental management system follows PTT group (parental company) SSHE management standard to operate responsibly through the implementation of SSHE management system in line with international standards.

PTT Group SSHE Management Standards

GPSC Group Quality, Security, Safety, Health

GPSC recognizes that electricity and steam generation processes can have a negative impact on human health in the community and the environment without the use of proper control measures. For this reason, GPSC has announced quality, security, occupational health and environmental policies, in order for the company to strive to develop its operations more efficiently and towards continual improvement, as well as to strive for excellence to be well accepted by all stakeholders, while also creating sustainability in its operations of the power and utility business.

GPSC Group Quality, Security, Safety, Health and Environment Policy

Environmental Management Strategy

GPSC is committed to conducting business with social and environmental responsibility under the strategy “Innovative & Sustainable Power for all”, which applies sustainability principles (Sustainability Management Framework) and 3D Principles of Energy Transition, including decentralization, decarbonization and digitization, which is a framework for delivering environmentally friendly energy through a circular economy in an efficient manner

Organizational Waste Management chart

Waste Management

Input Activity Waste generated Management approach Audit approach
Combustion processes to produce electricity and steam. NOx
  • Low NOX burner
  • Selective Catalytic Reduction (SCR)
  • Selective Non-Catalytic Reduction (SNCR)
  • Use of Continuous Emission Monitoring Systems: CEMS.
  • Conducting stack sampling measurements every 6 months.
  • Inspection of the air quality in the area inside and outside of the workplace according to legal criteria and the environmental impact prevention and correction measures every 6 months.
  • Limestone Injection, Seawater Flue Gas Desulfurization (SW-FGD)
Dust and mercury
  • Use Bituminous Coal (Low Impurities), Bag Filter, ESP
  • Fly ash
  • Heavy ash
  • Bag Filter, ESP
  • Imported as an alternative raw material for the manufacture of cement or.
  • Installation of heavy ash reuse systems, which can reduce heavy ash generated in the amount of 120 tons per year and reduce the accumulated sand sludge in the furnace of the CFB1 unit by up to 15 tons per month.
  • Preparation of a record regarding the amount of waste generated and sent for disposal, by an external organization on a monthly basis.
  • Report preparation summarizing the waste caused by the production process and hazardous waste requested for removal to the Department of Industrial Works every year.
Natural gas
Combustion processes to produce electricity and steam. NOx
  • Steam Injection System
  • Low NOx Burner System
  • Use of Continuous Emission Monitoring Systems: CEMS.
  • Monitoring of air quality from stack
  • Conducting stack sampling measurements every 6 months.
  • Steam Injection System
  • Low NOx Burner System
Water from outside suppliers
  • Cooling process
  • Steam production process
  • Mineral water production system
  • Condensate water quality improvement unit
  • Sea water through a “Once through cooling system”
  • Wastewater from production processes
Sea water
  • Regular inspection of the seawater pumping point to ensure the seawater pumping equipment and the aquaculture net to be in good working order.
  • Install a device to measure the temperature and residual chlorine of sea water after cooling to be careful not to exceed the standard of wastewater from the production process.
  • Reuse the effluent from the sludge dewatering system directly.
  • Reuse wastewater (RO Reject) in the industrial water production system.
  • Water from the coal yard and other wastewater are treated and collected in the pond before being recycled to spray onto coal piles to remove coal dust.
  • Send treatment at the center of the settlement.
  • Treat to achieve standard values and pass the criteria to then release back into natural water sources.
  • Seawater temperature checking in the cooling system prior to releasing this back into the sea. The GPSC group has installed a seawater temperature measurement device, which will work continuously to constantly display this value in the control room of the power plant. An aquatic breeding project in collaboration with fishery groups and local scholars was also conducted.
  • Water quality check on a monthly basis in accordance with the measures listed in the EIA and EHIA reports.
Water from natural sources, such as sea water
(for cooling and desalination processes in case of a drought)
Machine maintenance process Used lubricants, such as engine and transmission oils
  • Establish an agreement with the distribution company to reuse and recycle.
  • Send an agency that has been authorized by the government for further proper disposal.
  • Preparation of a record regarding the amount of waste generated and sent for disposal, by an external organization on a monthly basis.
  • Prepaparation of a report summarizing the waste caused by the production process and hazardous waste with requested permission to be removed to the Department of Industrial Works annually.
Chemicals, such as resins, hypochlorites and others
Machinery maintenance and pollution treatment processes Used chemicals and waste water contaminated containers
  • Establish an agreement with the distribution company to reuse and recycle.
  • Deliver the wastewater treatment at the center of the settlement.
  • Treat wastewater to standards, then pass the criteria to release back into natural water sources.
  • Send an agency that has been authorized by the government for further proper disposal.

Environmental Management Guidelines

GRI 103-2

GPSC places great importance on investing in technology that improves the efficiency of production processes, while also developing action plans to continuously reduce the amount of air pollution emission, such as nitrogen oxide gases (NOx), sulfur oxide (SOx) and total particulate matter (TSP). Emphasis will also be placed on controlling and monitoring the amount of air pollution from their sources in accordance with the measures set in the Environmental Impact Assessment Report (EIA). An environmental impact assessment report for projects (Environmental Impact and Health Assessment: EHIA) will also further be strictly used for assessing activities or any set of actions that may pose a serious impact on natural resources, environmental quality, health, sanitation and quality of life of individuals in communities through the following management guidelines:

  • Adopting low-level nitrogen oxide-emitting furnace technology (Low NOx Burner) to reduce nitrogen oxide generation from the entire combustion chamber of the Gas Turbine.
  • For the coal-fired power plants of GPSC, high quality bituminous coal with less than 1% sulfur will be supplied and limestone spraying technology will be used to remove sulfur oxide gas in the combustion of coal in a Circulating Fluidized Bed (CFB) boiler. There will also be an installation of a sulfur oxide gas removal system using sea water (Sea Water Flue Gas Desulfurization System: FGD) with pulverized coal fired boiler.
  • Installation of a dust collection system (TSP) and other impurities (such as mercury) by the Bag Filter.
  • Monitoring the amount of air pollution by the installation of a continuous emission monitoring system (CEMS) at the ventilation chimney and display air quality result as real-time on a sign placed in front of the power plant, such as Glow power plants and in the surrounding community areas with designated EIA and EHIA power plants.
  • Air quality measurements inside and outside of the workplace in accordance with the law.
  • Conducting air quality measurements through environmental impact prevention and mitigation measures every 6 months.
  • Construction of a tree buffer zone around the establishment to block the spread of air pollution to the surrounding outside area.

In addition to complying with various laws and regulations as defined in the EIA and EHIA reports, the GPSC group also adopted international standards for environmental management.

GRI 306-1, 306-2

GPSC is committed to minimizing the amount of waste generated from the manufacturing process as it demonstrates the efficiency in the production process, reduces the environmental impact and reduces the cost of waste treatment. For this reason, GPSC therefore adheres to the 3Rs (Reduce, Reuse and Recycle) principle by minimizing waste from various sources and when waste occurs, GPSC can then manage, reuse or repurpose all waste products, thereby continually reducing the amount of landfill waste, which has been set to zero since 2019. At present waste that may cause environmental impacts arising from production and maintenance processes, as well as other activities have an efficient management process that comply with international standards to prevent potential impacts on the environment and surrounding communities.

In addition, GPSC regularly controls and monitors the waste management of all power plants, in regards to the collection, storage and transportation of generated waste by the activities of the group, in accordance with the industrial waste management code, in order for these to be disposed of while also being in line with the regulations stipulated by law to prevent environmental impact. Furthermore, the company has raised awareness about the environmental impact of contractors, partners and customers by establishing an “industrial waste management process” and applying it to all power plants of the group, by having obtained licenses from relevant authorities prior to all types of waste and waste materials being transported out of the premises of the company. A process for assessing and approving the disposal of both toxic and non-toxic waste to the waste disposal company before leaving the factory each time has also been established.

The company also complies with the regulations of the Ministry of Industry under the Factory Act and the Hazardous Substance Act in the management of waste, waste materials, including hazardous waste and waste generated from the production process. It also monitors the waste sent for disposal by an external disposal contractor authorized by the Department of Industrial Works through the hazardous waste transportation supervision documents, including preparing an annual summary report according to the” Sorgor 3 Form” (แบบ สก. 3), which is a report regarding the amount of waste that the GPSC group dispatches annually to ensure that waste is handled as required by the GPSC and is in strict compliance with laws.

GRI 303-1, 303-2
Water management outside of GPSC

The management of outside water will be undertaken by becoming a member of the PTT Group Water Management. Meeting of the PTT Group Water Management occurs on a monthly basis, which covers reports regarding the water situation obtained from surveys and analysis of water situation models, as well as guidelines for monitoring risk reduction targets and water impacts for all operating areas. Therefore, this acts as a communication method to the responsible departments to thoroughly acknowledge and execute plans that have been set efficiently.

In addition, the PTT Group Water Management also participated in the Water Management of the Eastern Region of Rayong, comprising government agencies, Eastern Water Resources management and Development Company (East Water) and representatives from the private sector to monitor, assess, analyze the water situation and determine various measures, in order to reduce the risk of impact immediately.

GPSC also uses the Aqueduct Water Risk Atlas tool or WRI from the World Resources Institute to identify areas at risk from water stress areas and to define guidelines for external water management in all operational areas.

Water management within GPSC

The GPSC group has expressed a clear intention to manage water within the group to create the most cost-effective use of water together with communities, by following the 3Rs principle (Reduce, Reuse, Recycle) in the implementation of effective internal water management. The group follows the 3Rs principles to increase internal water efficiency, namely reducing water consumption in the power generation process, the recovery of the effluent from the cooling cooling system used to cool the boiler waste water and to recover condensate water in the steam production process.

GPSC also conducts regular audits of the quality of water released into the environment to ensure that the quality leaving GPSC operations is safe for the community and complies with legal standards.

GPSC does not directly obtain water from public sources, therefore no water sources are directly affected by the operations of the company. However, GPSC has closely monitored and followed the water situation around its operational areas.

In addition, GPSC conducts a water quality inspection prior to discharging such into the central wastewater treatment system of the Industrial Estate / natural water source to ensure that the quality of the effluent from the production process mettes the legal standards, as well as in accordance to local authorities, where in previous times and in the past, it was found that the quality of effluent was better than the standard set for each project.

GPSC manages the environment in accordance with the policy of quality, security, occupational health and environment in order to achieve continuous development in environmental operations, while also meeting expectations of stakeholders in a sustainable manner. GPSC also sets the direction for environmental management operations that cover all departments throughout the value chain and all business process from the planning and design phase, until the completion of projects, with the group establishing the following guidelines:


1. Performance audit by international accreditation bodies

2. Excellence in ecological efficiency guaranteed by the Ecological Factory Program (Eco Factory)

GPSC group realizes environmental friendly operations for sustainable development with a focus on the development and improvement of the production processes and environmental management on the basis of social responsibility, both inside and outside of the organization continuously throughout the value chain. As a result of this concrete commitment, all key establishments of the GPSC group have received the Eco Factory project certification from the Industrial Environment Institute and the Federation of Thai Industries.

3. Measures for prevention and reduction of environmental impacts consistent with the Environmental Impact Assessment EIA report

Organizations and business projects of the GPSC group conduct an environmental impact assessment report prior to the commencement of a legal project. Environmental impact assessment is based on academic principles to forecast both positive and negative impacts from potential projects to the environment and communities, with the primary objective of ensuring that all impacts that may arise from projects have been carefully considered, from the planning and decision-making stages related to the implementation of each project. Additionally, the GPSC group has added further environmental impact prevention and mitigation measures, as stated in the EIA report, alongside ensuring efficient operations, monitoring of environmental quality, such as air quality, noise levels, water quality and occupational health and safety for employees, etc to be in accordance with the contents of the Environmental Impact Assessment Report of the GPSC group.

Can be further viewed here

4. Systematic and effective communication of environmental issues

GPSC conducts an effective and systematic communication of environmental issues to stakeholders in accordance with the GPSC group’s Quality, Security, Occupational Health and Environmental Communication Manual.

5. Building a culture of environmental management

Monitoring and investigating substandard actions or conditions, near accidents, accidents or unusual events. GPSC has implemented a systematic approach that includes management approaches from the receiving of a situation or incident, to identifying the cause or defect, as well as creating a remediation plan and ongoing monitoring.

6. Building a culture of environmental management

GPSC has undertaken activities in building an environmental management culture, to raise awareness of workers and manage the environment according to the guidelines strictly set by GPSC, by regularly sharing information or offering lessons on environmental management at the supervisor level of each plant and communicating the issues of environmental management within the organization through the Intranet system and various sign boards within the workplace.

Revised as of February 2021

The above content has adapted by international sustainability reporting Standards (Global Reporting Initiative: GRI), the GRI Standards edition). This edition has been verified for the accuracy of limited reporting data (Limited Assurance) by third party.