Geothermal drilling in Koluszki, Poland reaches target depth
Geothermal drilling operations at Koluszki, Poland (source: Lodzkie.pl)
Carlo Cariaga
4 Feb 2026
An exploration geothermal well in Koluszki, Poland has been drilled to its target 1595 meters depth, with casing and well testing to commence shortly.
A geothermal exploration well being drilled in the city of Koluszki in Poland has reached its target depth, as announced by the Office of the Lodz Voivodeship. There is still plenty of work to be done as the well is still being prepared for casing, after which geophysical surveys will be done.
Geothermal drilling in Koluszki started in July 2025. It had an initial target depth of 1450 meters but a decision was made to deepen the well to 1595 meters. According to the announcement, drilling had reached a depth where parameters indicative of an aquifer with potential thermal water were found. The team will soon have to measure the water temperature, degree of mineralization, and hydraulic parameters to determine the well’s suitability for geothermal water utilization.
“We’re waiting for the best news regarding water temperature. Hopefully, the results will be good, as further work in this area has a good chance of success. The test results, including water temperature, mineralization level, and well yield, will be available soon,” said Tomasz Krawczyk, deputy mayor of Koluszki.
The cost of the drilling is PLN 12 million. Koluszki was one of the communes selected for funding by the National Fund for Environmental Protection and Water Management (NFOSiGW) in late 2024, thus providing them a grant of PLN 10.6 million for geothermal exploration.
If the exploration well yields positive results, the city is considering its use for recreational or medicinal purposes. Depending on the parameters of the thermal water, it can also be used to heat residential buildings, schools, and public facilities.
Source: National Geological Institute
