Deep Borehole distribution on the Czech territory is very irregular. More than 2000 boreholes deeper as 1000m were drilled for various purposes to the end of year 1989. The deepest borehole exists nearby the town Jablůnka (6306 m). For geothermal interpretation it was able to use about 3300 boreholes with utilizable temperature data and only about 550 boreholes have a complete temperature logging.
Whole borehole database was detailed treated using new special formula for deep temperatures approximation: T(°C) = a . h2 + b . h + c. This equation was used on about 3300 boreholes for the estimation of temperature values for the depth 4 and 5 km as the correlation with measured temperature, witch was used for calculation of geothermal potential.
Theoretical Geothermal Potential of whole area of Czech Republic for the upper part of the Earth crust can be estimated on EGT = 118 000 000 PJ (One year total need of primary sources Czech Republic is only 1 800 P). More than sixty localities were identified to be able to produce 3400 MW electrical energy (about 24 TWh/year) at present drilling technologies. Whole area of Czech Republic can produce 1500MW energy for the heating using heat pumps at the same time.