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Table 3 Comparison of costs of carried out or planned reconstructions with the costs of a drilling a new well (according to costs updated for 2020)

From: Reconstruction of geothermal boreholes in Poland

Well (depth)

Reconstructed well

New well in that areab

Net cost (M€)

Effect obtained (m3/h)

Net cost factor (k€/m3)

Net cost (M€)

Effect expected (m3/h)

Net cost factor (k€/m3)

Mszczonów IG-1 (1793 m)

0.77

60.0

12.8

2.65

> 150 m3/h

17.7

Poręba Wielka IG-1 (2002 m)

0.42

16.1

26.1

2.84

10–20 m3/h

180.0

Biały Dunajec PAN-1 (2606,1 m MD 2592,8 m TVD)

1.42

375.0

3.8

3.40

ca. 400 m3/h

8.5

Czarny Potok GT-1a (2600 m)

0.86

250–300 kWt

3.0 (k€/kWt)

3.02

250–300 kWt

10.0 (k€/kWt)

  1. aNegative well (project for coaxial hole heat exchanger was designed) − drilling cost in the years 2010 ÷ 2011 − 3.0 M€ (reconstruction project not implemented)
  2. bEstimated values