The Bocamina Thermoelectric Plant is located in the sector of Lo Rojas, District of Coronel, Region of Biobío, Chile.

The Plant is comprised of two units: Unit 1 and Unit 2; their purpose is to generate electrical energy. Their primary fuel is coal and the installed capacity of both units is 478 MW (128 MW in Unit 1 and 350 MW in Unit 2).

Environmental performance

The improvement in the Plant's environmental performance has been the constant focus over past years, adding up to an investment of over USD $200 million. This investment has made it possible to decrease emissions by more than what is required by applicable regulations. An example of this is that it has been indicated that particulate matter emissions are 80% lower than the limits of S.D. No. 13/11 from the Ministry of the Environment, and the limits stipulated by the Environmental Qualification Resolution.


  • The Plant performs ongoing follow-up of different environmental variables, such as atmospheric emissions, air quality, noise, liquid effluents, and the marine environment, at 90 different monitoring points.
  • Bocamina is the first Thermoelectric Plant in Chile to communicate its emissions in real time to the Superintendency of the Environment (SMA).
  • Both units have desulfurization systems for the reduction of SO2, sleeve filters to mitigate the particulate matter emissions, and combustion system with low emissions of NOx.
  • The Bocamina Thermoelectric Plant has the highest carbon management standard in Chile and South America. Both fields (north and south) are covered by geodesic domes that prevent fugitive emissions from being released into the environment, due to the movement of the material and the wind activity.


Both units have 3-millimeter sieve filters in the siphon of the seawater intake system in order to impede the entry of large hydrobiological organisms and prevent smaller organisms from being sucked in.