Prokon filed for bankrupcy protection in court in Itzehoe, Germany and 40 000 investors lost 1.4 billion Euro$. That was in 2014 and what made matters worse was when several complaints were filed again in 2016 by new investors who also lost their shirt in that scam. The German government then banned Prokon from selling more shares.
Prokon then restructured to form a "Genossenschaft" which unlike a corporation that sells shares lures in investors with a promise to get a share of the profits.
But there were no profits and Prokon blames it now on "the worst few years due to a lack of wind" while continuing to run up more debt and sucking in more investors.
In the USA that would qualify for a Ponzi scheme, but in Germany "renewable energy" is a sacred cow.
"Wir wollen in den nächsten drei bis fünf Jahren die Zahl unserer Mitglieder mehr als verdoppeln und 100.000 Genossen erreichen", sagte der Aufsichtsratsvorsitzende Udo Wittler.
Translation:
We aim to double our membership to 100 000 "Genossen", says Udo Wittler
Ex-Pleitefirma: Prokon umwirbt neue Investoren - SPIEGEL ONLINE - Wirtschaft
Ex-Pleitefirma Prokon umwirbt neue Investoren
Translation: ex bankrupt Prokon courts new investors
Windkraftbetreiber: Prokon macht riesigen Verlust - SPIEGEL ONLINE - Wirtschaft
Translation: Prokon occurs huge losses (again)
By the way "Genosse" is what communists in ex east Germany used to call each other