In 2020, the TG1 unit at HC Nechranice underwent general overhaul, which included the replacement of the DN 2600 butterfly valve at the entrance to the spiral case.

From 19th to 22nd April 2021, guarantee measurement was performed on the TG1 unit according to the ČSN EN 62 006 standard, class B, i.e. flow measurement was performed using the Winter-Kennedy index method. The measurement also served to optimize existing on-cam relation.