In the Australian desert, a hybrid solar power plant powers telescopes so sensitive that their ‘brain’ requires two layers of metal to remain silent

In a remote western Australian location, rows of solar panels feed electricity towards machines that listen beyond Earth.

Solar power typically is the answer to an energy issue. Electricity generation at this observatory can also generate the noise that scientists sought to avoid.

The telescopes are able to detect radio signals that are much weaker than the radio signals used for communication in cities and at home. Without special protection, their own computers would swamp those signals.

When the demand for electricity at the observatory exceeds the supply from the sun and stored energy, diesel generators provide the electricity.

With the expansion of construction on the site, how do engineers power astronomy without making the observatory electronically louder?

How solar energy reached a radio-quiet observatory

The facility is located at Inyarrimanha Ilgari Bundara, CSIRO’s Murchison Radio-astronomy Observatory, on Wajarri Yamaji Country.

This location is very quiet for radio, but also very far from normal power infrastructure.

CSIRO thus constructed a dedicated off-grid station in collaboration with Australian energy partners. The system is solar, battery, and diesel.

It has a solar array that generates 1.85 megawatts and a large lithium-ion battery that stores energy for later use.

When the demand for electricity at the observatory exceeds the supply from the sun and stored energy, diesel generators provide the electricity.

According to CSIRO, it is the first hybrid-renewable facility to power a large remote astronomical observatory.

The station provides ASKAP, other modern instruments and key observatory infrastructure.

ASKAP is an array of 36 dish antennas that can map large areas of the southern sky. Instruments nearby are used to investigate lower frequency signals from cosmic history.

It’s not a typical desert power project. All electrical equipment is situated next to receivers that are able to receive very weak radio signals.

The power supply could drown out the science

Radio telescopes are not like the backyard telescopes that gather visible light. They detect radio energy coming from the universe from natural sources.

Many human technologies operate at the same frequencies. Interference can be caused by digital television, mobile networks, electrical equipment and poorly shielded electronics.

To reduce that contamination, the Australia Telescope National Facility has created a large radio quiet area around the observatory.

While remoteness does do a lot to eliminate outside noise, it does not eliminate equipment noise within the site.

The observatory needs to maintain servers, cooling systems, communication devices, batteries, generators and power converters. All devices can emit unwanted electromagnetic radiation.

That forms a paradox at the heart of the project. The more computing power there is, the more interference engineers can control.

The competition is increasing as SKA-Low is rising in the same landscape. By March 2026, about 18,000 antennas were in place.

The completed telescope will feature 131,072 tiny antennas. Their combined data will need new processing facilities and another large power station that will use a lot of renewable energy.

For that expansion to hear more deeply, its machinery must first learn to be quiet.

The metal casing that encases the observatory’s electronic brain

The present control building remains quiet by blocking electromagnetic emissions from escaping.

It has two thick layers of metal shielding that protect its computers and necessary electronics. Airlock-type doors maintain that barrier when people enter.

Optical fiber is used to bring the signals from the telescope into the building since it does not radiate as do traditional copper connections.

This setup creates a secure electronic enclosure in the control center. Observations can be made on the computer without sending them out over the radio quiet site.

The power station needed the same treatment. Interference can be emitted from a converter, battery and generator during normal operation.

Engineers created shielding solutions for these systems. CSIRO says related techniques can reduce emissions by factors of billions.

The hybrid system cannot solve independently.

The entire future SKA-Low telescope is not yet powered by the current station.

According to CSIRO, SKA-Low will need another station that will be powered primarily by renewable energy.

There is also diesel backup in the existing plant. Hybrid-renewable is not synonymous with solar providing all watts all the time.

It has a 2.5 megawatt-hour battery that provides solar energy beyond daylight hours. Continuous operations are still protected at this isolated site with backup generation.

It is not all of the antennas spread out across the desert but the current precursor control building is surrounded by the double metal shell.

The protection required for future SKA-Low facilities is similar, with a central processing building and smaller remote structures.

This restriction makes the achievement more achievable, not less impressive

Electrical silence is as much an engineering requirement as reliability and energy supply.

That requirement makes all power decisions directly tied to the scientific sensitivity of the observatory.

The solar array appears to be the most recognizable of the observatory’s technologies when viewed from the air.

Its true meaning seems further off, as antennas await signals that have travelled across space before landing in the Australian desert.

The power station needs to maintain those instruments without participating in the conversation.

There is no empty silence. It establishes the environment for distant messages to survive.

The electronic brain operates at its peak speed behind two layers of metal. The universe can come as a whisper outside.