Extremely Large Telescope Threatened by Energy Project in Chile

February 6, 2025

The Atacama Desert in northern Chile is renowned for its exceptional conditions for astronomical observation. Its clear, dark skies have attracted multiple world-class observatories. However, a proposed green energy megaproject threatens to disrupt these conditions. This project, backed by AES Andes, aims to construct an extensive energy infrastructure for hydrogen and green ammonia production. Its proximity to the Paranal Observatory, home to the European Southern Observatory’s Extremely Large Telescope, poses risks to astronomical research.

Importance of the Atacama Desert for Astronomy

The Atacama Desert is considered one of the best locations on Earth for astronomical studies.
Its high altitude and minimal light pollution provide ideal conditions.
The Paranal Observatory is a key facility in this region, which has become a hub for nearly 40% of the world’s ground-based astronomy.
The area is expected to increase this capacity to 60% within the next decade.

The Extremely Large Telescope (ELT)

The Extremely Large Telescope is a $1.5 billion project under construction.
It features a primary mirror nearly 40 meters in diameter.
The ELT aims to revolutionise our understanding of the universe, including dark energy and exoplanet imaging.
Its location on Cerro Armazones is crucial for maintaining optimal observational conditions.

The INNA Project

The Integrated Energy Infrastructure Project for the Generation of Hydrogen and Green Ammonia, or INNA, is a $10 billion initiative.
It plans to utilise over 3,000 hectares of land.
Concerns arise as parts of the project may be as close as five kilometres to the Paranal Observatory.
This proximity could result in detrimental effects on astronomical observations.

Risks to Astronomical Observations

ESO officials warn that the INNA project could lead to increased dust emissions and light pollution. These factors may severely compromise the telescope’s capabilities. A study brought into light that Paranal is the darkest site among 28 major observatories globally. The potential light pollution from the INNA project could irreparably impact the pristine night skies essential for astronomical research.

Future of Ground-Based Astronomy

The ongoing developments in the Atacama Desert are critical for future astronomical discoveries. The ELT and other advanced telescopes are expected to contribute to our understanding of the universe. Any disruption caused by the INNA project could limit access to key areas of exploration. This would hinder the scientific advancements that the ELT is poised to deliver.

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