How can golden visa investors put their money in renewable energy projects in Greece?

Under the Greek golden visa program, non-EU/EEA foreign investors are entitled to obtain a permanent residence permit for their business activities in Greece, if they have investment projects worth at least 250,000 euros. Investment can be in construction of new facilities or business acquisitions, restructuring as well as expansion of existing activities, provided that the positive impact on the national economy is documented.

It needs to be considered as a property to issue a golden visa. Or you can invest 400k through some programs, especially the bank system.