https://phys.org/news/2018-05-lava-hawaii-power.html

The wells run as deep as 8,000 feet (2,438 meters) underground at the plant, which covers around 40 acres (16 hectares) of the 815-acre (329.8 hectare) property. The plant has capacity to produce 38 megawatts of electricity, providing roughly one-quarter of the Big Island's daily energy demand.

Lava destroyed a building near the plant, bringing the total number of structures overtaken in the past several weeks to nearly 50, including dozens of homes. The latest was a warehouse adjacent to the Puna plant, covered by lava on Monday night, Hawaii County spokeswoman Janet Snyder told the Honolulu Star-Advertiser. The building was owned by the state of Hawaii, and was used in geothermal research projects in the early days of the site.