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Vatican officials have estimated it will cost under 100 million euros ($114 million) to develop the solar farm, and that once it is approved by the Italian parliament, the contracts to do the work could be put up for bids. Photo: Vatican Media According to the Vatican's press office, the installation will apply the most advanced solutions currently. . ROME (AP) — Italy agreed Thursday to a Vatican plan to turn a 430-hectare (1,000-acre) field north of Rome, once the source of controversy between the two, into a vast solar farm that the Holy See hopes will generate enough electricity to meet its needs and turn Vatican City into the world's first. . Capacity Requirements: The Vatican"s 300 kW solar array requires storage to balance supply and demand. Technology Choice: Lithium-ion batteries dominate due to efficiency and declining prices. Infrastructure Integration: Retrofitting historic buildings adds complexity and cost. Capacity. . Major projects now deploy clusters of 20+ containers creating storage farms with 100+MWh capacity at costs below $280/kWh. Next-generation thermal management systems maintain optimal. . By Tarek Salame • Published: 31 May 2025 • 12:56 • 2 minutes read Vatican City now runs fully on solar power. Credit: Petr Polak Most people would not expect the world's smallest country, with fewer than 1,000 residents, to lead the global energy conversation. This is what you're really. .