Yeah it's crazy. It's gradually going down over the next few years. The most perverse part of this tax is that it's regressive: industrial users pay almost nothing.

A number of energy companies offer "dynamic" contracts. They announce the price for each hour the day before, which is based on some European auction system. Most people however still prefer a fixed price contract. Right now those go for €0.23 - €0.34 per kWh including tax, depending on how long you want the price fixed (e.g. one month, one year, three years).

Those contracts used to be the norm so the government tax wasn't as obviously weird. Now suddenly you have to PAY taxes to consume negatively priced electricity.