The Company thus gives importance to system designing, machinery and equipment that reduces noise at source, in tandem with the implementation of 3 key noise management approaches which are:

  1. Noise control at source through the installation of silencers at noise-generating machinery and equipment and the requirement that activities with loud noise must be undertaken only during the day with advance notification to community
  2. Control at transmission paths through the placement of machinery and equipment as far as possible from community to reduce the impacts, tree planting around the premises, sound barriers or sound insulation along the fence close to community or noise-sensitive areas, and
  3. Protection of exposed individuals through warning signs in areas with loud noise, provision of personal earplugs and earmuffs to job operators and limit of working hours in loud noise areas to keep cumulative noise within the standard limit.

Noise management measures

Noise

At Hin Kong Power Plant, an IPP which started contributing revenue in this reporting year, a permanent noise barrier was installed at the south fence area as stated in EIA report, to prevent impacts on households located near the power plant. A noise contour map was prepared in the first year, which is to be repeated every 3 years.

Results of noise level measurement

All 5 power plants in Thailand (contributing 59.53% of total revenue) were able to control noise impacts as specified in EIA reports. The average noise level and maximum noise level in 2025 at the power plants and in community areas were within standard limits and did not cause impacts on community.

Power Plant 24-hour average
noise level
Standards Maximum noise
level
Standards
Ratchaburi (3 sampling points) 48.4-61.0 70 (decibel (A)) 74.3-105.5 115 (decibel (A))
Hin Kong (4 sampling points) 47.5-63.3 62.3-106.6
RATCH Cogeneration (3 sampling points) 53.1-56.1 80.6-112.5
RATCH Energy Rayong (2 sampling points) 49.8-58.1 73.2-100.3
RATCH Pathana Energy (5 sampling points) 56.0- 68.9 74.8-94.6

Note: The standards of 24-hour average noise level and maximum level are specified in the No.15 Notification of the National Environmental Board B.E.2540 (1997).