The volcanoes of Costa Rica’s lauded national park system have helped make it a tourism favorite for generations. But three bills before the national legislature offer a reminder that volcanoes also make the parks attractive for another use: drilling for geothermal power.

Demand for electricity has been rising in Costa Rica for decades, and proponents say geothermal—tapping the heat trapped underground and using it to drive turbines—is a carbon-free solution, for a country that has pledged to reach carbon neutrality by 2021. However, the volcanic areas with the highest geothermic activity have long been set aside as national parks, causing conflict between conservationists and the country’s state electrical company.

The new legislation would allow the exploitation of geothermal energy within protected areas: