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A large portion of astronomy's carbon footprint stems from fossil fuelssupplying the power demand of astronomical observatories. Here, we explorevarious isolated low-carbon power system setups for the newly planned AtacamaLarge Aperture Submillimeter Telescope, and compare them to a business-as-usualdiesel power generated system. Technologies included in the designed systemsare photovoltaics, concentrated solar power, diesel generators, batteries, andhydrogen storage. We adapt the electricity system optimization model highRES tothis case study and feed it with the telescope's projected energy demand, costassumptions for the year 2030 and site-specific capacity factors. Our resultsshow that the lowest-cost system with LCOEs of $116/MWh majorly usesphotovoltaics paired with batteries and fuel cells running on imported andon-site produced green hydrogen. Some diesel generators run for backup. Thissolution would reduce the telescope's power-side carbon footprint by 95%compared to the business-as-usual case.

A renewable power system for an off-grid sustainable telescope fueled by solar power, batteries and green hydrogen