A geothermal engineering project in Iceland drilled 1.3 miles into the Earth and unexpectedly hit a pocket of magma. Instead of capping the hole, as was done in a similar instance previously, they decided to see if they could harness the energy of the magma.
“Drilling into magma is a very rare occurrence, and this is only the second known instance anywhere in the world,” Elders said. The IDDP and Iceland’s National Power Company, which operates the Krafla geothermal power plant nearby, decided to make a substantial investment to investigate the hole further.
This meant cementing a steel casing into the well, leaving a perforated section at the bottom closest to the magma. Heat was allowed to slowly build in the borehole, and eventually superheated steam flowed up through the well for the next two years.
Elders said that the success of the drilling was “amazing, to say the least”, adding: “This could lead to a revolution in the energy efficiency of high-temperature geothermal projects in the future.”
The well funnelled superheated, high-pressure steam for months at temperatures of over 450°C — a world record. In comparison, geothermal resources in the UK rarely reach higher than around 60-80°C.