The following link is also very useful: https://www.transportenvironment.org/discover/german-taxpayers-face-e7-6bn-bill-for-fuel-tax-cuts-skewed-towards-the-rich-study-finds/
Don't know bout energy taxes, but if you meant the CO2related taxes and penalties within the EU, they were purposefully designed to support German firms specializing in green energy at the expense of less developed new member economies such as Poland; more reliant on eg coal.