A large volume, two-phase reservoir, with a capacity of about 19 mi³ (80 km³), underlies the Donau (lake) Bratan Caldera on the island of Bali. Recent resistivity modeling indicates that the reservoir is at a depth of about 3,300 ft (1,000 m). If the reservoir rock porosity is assumed to be 8%, the saturation to be 32.5% and the temperature to be 245°C, the total energy stored in the reservoir is about 2 × 10¹² MJ. This means that a promising geothermal field awaits development on Bali.

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