Mejillones power station

From Global Energy Monitor


Mejillones power station is a 935-megawatt (MW) dual-fuel power station owned by Engie Energía Chile S.A. (formerly E-CL) in Mejillones, Antofagasta, Chile. The plant consists of two original coal-fired units with a combined capacity of 334 MW, a 226 MW gas-fired combined cycle unit, and a 375 MW coal-fired expansion unit. The newer unit is alternatively known as Infraestructura Energética de Mejillones, IEM1, or Red Dragon.


The undated satellite photo below shows the old plant site to the southwest and the new "Red Dragon" unit to the northeast, near Mejillones, Antofagasta, Chile.

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Unit 1 (listed by various sources as 160 MW or 162 MW) and Unit 2 (listed as 172 MW or 174 MW)[1][2] were built in 1996 and 1998, respectively.[3] The gas-fired, combined cycle Unit 3 was brought online in 2000.[4]

Coal for the plant arrives via the Port of Mejillones.

Units 4 and 5, each 375 MW, also known respectively as IEM1 and IEM2 or collectively as the Red Dragon expansion project, received environmental approval in 2010.[5] In May 2012, E-CL sold 30% of the project to Chile-based Luksic Group and was reportedly looking for a second business partner to buy a 30% share, which would leave E-CL with a 40% stake.[6] To make construction of the plant viable, E-CL sought to sign an energy contract with one of northern Chile's large mining companies. However, as of July 2013, E-CL's General Manager Lodewijk Verdeyen acknowledged that no deal had been reached, effectively postponing construction of the plant indefinitely.[7][8]

E-CL continued to hold out hopes that a proposed new transmission line linking Chile's two major power grids (northern Chile's SING grid and central Chile's SIC grid) might help E-CL find customers for the plant's electricity further afield, in Chile's Atacama region. In December 2014, EC-L won a 15-year contract to supply 5,040 GWh of electricity annually to central Chile's SIC grid via the new transmission line, and the Mejillones power plant was mentioned as a potential energy supplier for the grid. However, the total size of the IEM expansion was reported as only 375 MW, implying the expansion's second unit (Unit 5) might be deferred.[9]

In January 2015, Chilean energy minister Máximo Pacheco announced that the connector line, to be constructed by EC-L, would be ready by 2017[10][11], and the Chilean business news site La Tercera Negocios cited 2018 as the anticipated completion date for Infraestructura Energética's Unit 1.[12]

Doosan Škoda Power was chosen to supply the 375-MW steam turbine for the power plant, with South Korea’s SK Engineering & Construction providing EPC support.[13] Along with the 375 MW IEM1 power station, Engie's plans called for construction of a port designed to receive more than 6 million tons of coal and limestone a year. The total investment for the plant and port was estimated at US$1.1 billion.[14]

In October 2015, Engie Energia Chile's CFO Alex Freitas announced that IEM unit 1 was on schedule to begin commercial operations in July 2018, but that IEM unit 2 had been shelved following Engie's recent decision to stop building new coal-fired plants.[15][16] In mid-2016, Chile's national energy journal Electricidad confirmed the projected July 2018 start-up date.[17]

In October 2016, the Chilean business news site Pulso reported that Engie had put IEM2 up for sale in early 2016 and was also looking to sell its interests in the port project. Axel Leveque, CEO of Engie Energia Chile, was quoted as saying that Engie would not pursue further development of IEM2 due to the company's shifting focus towards renewable energy, but that he expected a buyer for IEM2 to eventually step forward, as the site, permits and engineering plans for the second unit are already in place.[18] However, given the fact that IEM2 is not mentioned in the comprehensive June 2019 plan for Chilean coal-fired plants put forward by President Sebastián Piñera and the Chilean Ministry of Energy, it appears that IEM2 has been definitively cancelled.[1]

As of December 2016, IEM1 was 57% complete and still on track to begin commercial operations in mid-2018, while the port was 58% complete.[19]

In November 2017 E-CL announced successful completion of the 600km-long transmission line between Mejillones (Antofagasta region) and Cardones (Atacama region), allowing Chile's two major power grids (northern Chile's SING grid and central Chile's SIC grid) to interconnect.[20]

In October 2018 Unit 4 (IEM1) began test operations.[21] In November 2018 it was reported the the plant would be commissioned in Q1 2019.[22]

Unit 4 began commercial operations in May 2019.[23][24]

Environmental & Social Impact

Results of Universidad Católica's 2019 study on the negative health effects of coal plants in northern Chile's sacrifice zones (Source: La Tercera)[25]

Mejillones Unit 4 (IEM1) is the largest coal-fired plant in Chile, consuming 228 tons of coal per hour and immense quantities of water. Environmental groups note that despite Engie's much-touted June 2019 retirement of two units at the nearby Tocopilla power station, the commissioning of Mejillones Unit 4 actually represents a significant increase in Engie's coal-fired electricity production in the Antofagasta region, which according to a 2019 study by Universidad Católica and Chile Sustentable suffers some of the nation’s highest rates of lung cancer, asthma, and other respiratory illnesses.[25][26]

In July 2020, a coalition including the environmental NGO FIMA and the Mejillones Association of Tourist Service Providers petitioned Chile's Comptroller General's office to rule on the legality of continued operations by Engie's Mejillones Units 1 and 2. The complainants maintain that the older Mejillones units, which pre-date the enactment of Chile's Environmental Impact Assessment System, are operating without necessary safeguards and thereby causing damage to the environment and the health of local residents.[27]

Planned Retirement

In June 2019, Chilean president Sebastián Piñera announced a plan drafted by the Chilean Ministry of Energy calling for the decommissioning of all Chilean coal-fired plants by 2040.[28]

In December 2019 Engie announced that it would retire Unit 1 and Unit 2 by the end of 2024 instead of the previously planned date of 2040.[2] The exact retirement date for Unit 4 (IEM1) remains uncertain, but plant owner Engie has agreed to consult with the government every five years to renew details of the plan, taking into account management and shareholder input, Engie's legal obligations to meet environmental targets and supply contracted levels of power, and other criteria.[1]

As of December 2020, Units 1 and 2 were still scheduled for retirement in December 2024.[29]

In April 2021, Engie announced plans to retrofit the IEM1 plant to run on natural gas by 2025.[30][31][32]

Project Details

  • Sponsor: Engie Energía Chile S.A.[2] (formerly E-CL)[4]
  • Parent company: Engie
  • Location: Mejillones, Antofagasta, Chile
  • Coordinates: -23.0860251, -70.4049643 (exact)
  • Gross generating capacity (operating): 935 MW
    • Mejillones power station Unit 1: Coal-fired subcritical, 162 MW[2] (start-up in 1995[4])
    • Mejillones power station Unit 2: Coal-fired subcritical, 172 MW[2] (start-up in 1998[4])
    • Mejillones power station Unit 3: Gas-fired, combined cycle[4], 226 MW[33][34] (start-up in 2000[4])
    • IEM1 (Red Dragon) power station Unit 4: Coal-fired subcritical, 375 MW[1] (start-up in 2019[24])
  • Gross generating capacity (cancelled): 375 MW
    • IEM2 (Red Dragon) power station Unit 5: Coal-fired subcritical, 375 MW[15]
  • Coal Type: Subbituminous, Bituminous[16]
  • Coal Source: Imported through Port of Mejillones

Articles and resources


  1. 1.0 1.1 1.2 1.3 "Plan de Descarbonización y Retiro de Centrales Termoeléctricas a Carbón en Chile, Anuncio del gobierno de Sebastián Piñera" (PDF). Chile Sustentable. June 4, 2019.
  2. 2.0 2.1 2.2 2.3 2.4 Engie, AES to retire 674 MW of coal capacity in Chile earlier than agreed, Renewables Now, Dec. 10, 2019
  3. "Mejillones Coal Plant," Global Energy Observatory, accessed June 2018
  4. 4.0 4.1 4.2 4.3 4.4 4.5 "Anuario y Estadísticas de Operación (p 34)" (PDF). CDEC/SING. 2014.
  5. "Ficha del Proyecto: Infraestructura Energética Mejillones," Servicio de Evaluación Ambiental, 2010
  6. "Luksic negocia comprar 30% de nuevo proyecto de E-CL en Mejillones". Minería Chilena. May 8, 2012.
  7. "E-CL posterga proyecto por US$ 1.500 millones en el norte," Economía y Negocios, July 5, 2013
  8. "E.CL Falls After Postponing Northern Chile Power Project," Bloomberg, July 5, 2013
  9. "French energy firms win contracts in Chilean electricity tender". S&P Global Platts. December 12, 2014.
  10. "Máximo Pacheco anunció que interconexión eléctrica entre el SIC y SING estará lista el 2017". Radio Duna. January 29, 2015.
  11. "Chile to Connect Its 2 Major Power Grids by 2017," Latin American Herald Tribune, January 30, 2015.
  12. "La revancha de GDF Suez en Chile". La Tercera / Electricidad. February 2, 2015.
  13. "Doosan Škoda Power to supply steam turbine for Chile's power plant". Prague Monitor. 2016-02-16.
  14. "Obras en nueva central termoeléctrica y puerto en Mejillones registran avance de hasta casi 34%," Electricidad, May 24, 2016
  15. 15.0 15.1 "Chile's E-CL to shelve 375MW coal project," BN Americas, October 30, 2015
  16. 16.0 16.1 "Infraestructura Energética Mejillones: Potencia en Construcción". Revista Construcción Minera (Issuu). August 1, 2016.
  17. "Infraestructura Energética Mejillones: El proyecto de E-CL que usará la línea de interconexión SIC-SING," Electricidad, June 8, 2016
  18. "Engie está "en conversaciones" para enajenar puerto de Mejillones". Pulso / Electricidad. October 4, 2016.
  19. "Engie: Hay que avanzar en integración energética en la región," El Mercurio, April 7, 2017
  20. "Con Éxito TEN Finaliza Proyecto y Da Inicio a Histórica Interconexión Eléctrica en Chile". Arica al Día. November 28, 2017.
  22. End to the coal age: Engie enlists the opening of the last plant of this type in Chile LT Pulso, Nov. 26, 2018
  23. Más carbón al aire en Mejillones: La firma francesa Engie inaugura nueva central termoeléctrica en la región de Antofagasta, El Diario, May 30, 2019
  24. 24.0 24.1 "Entró en operación la última central a carbón del país en manos de Engie". Electricidad. May 22, 2019.
  25. 25.0 25.1 González, Karen (August 25, 2019). "Estudio UC: habitantes de zonas con termoeléctricas se enferman 4 veces más - La Tercera". La Tercera. Retrieved 2020-06-02.
  26. Fajardo, Marco (August 29, 2019). "La ironía de Mejillones y Tocopilla: zona alberga a nueva termoeléctrica en región con la mayor tasa de cáncer al pulmón del país". El Mostrador. Retrieved 2020-06-02.
  27. "Drama ambiental en Mejillones: Piden a Contraloría pronunciarse por el funcionamiento de Central Termoeléctrica". El Diario de Antofagasta. 2020-07-31.
  28. "Presidente Piñera presenta plan para cerrar todas las centrales energéticas a carbón y que Chile sea carbono neutral". Gobierno de Chile. June 4, 2019.
  29. "Retiro del carbón se reactivará en enero de 2022 con salida de dos unidades de Central Tocopilla". Electricidad. December 31, 2020.
  30. "Gobierno anuncia el retiro del 50% de las centrales a carbón al 2025". Ministerio del Medio Ambiente. April 28, 2021.
  31. "Chile speeds up plans to close coal plants, to retire half its fleet by 2025 | S&P Global Platts". April 28, 2021.
  32. "Tras anuncio de Engie de salida total del carbón para 2025, ambientalistas apuntan a Aes Gener y Colbún". El Mostrador. April 28, 2021.
  33. "Reporte Integrado (p 28)" (PDF). ENGIE Energía Chile SA. 2016.
  34. "Engie". Generadoras de Chile. Retrieved 2021-05-06.

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