The run-of-river power plant is equipped with a fish bypass which has ensured the unhindered migration of fish since 2013. At the weir, the fish bypass was constructed in the form of an enature FISHPASS. It has a total length of 435 metres and overcomes a height difference of 15.5 metres. A very low flow speed allows above all juvenile fish and weak-swimming fish (e.g. European bullhead) to pass with ease.
The implementation of a large number of environmental measures in the Mölltal in 2014 included the near-natural design of the headrace channel of the Malta Lower Stage power plant. The removal of the canal bank now offers space for bank vegetation and areas of retreat for aquatic and shoreline lifeforms.