Between 2009 and 2012, she was Saarland's State Minister for the Environment, Energy and Transport in the cabinet of former Minister-President Peter Müller (CDU).

[1] Peter served as a Green Party delegate to the Federal Convention for the purpose of electing the President of Germany in 2017.

Since February 2018, Peter has been serving as chairwoman of the German Renewable Energy Federation (BEE).

Raised in Dillingen, Peter studied microbiology at Universität des Saarlandes in Saarbrücken and received a PhD.

After being editor-in-chief of Eurosolar, she was founding director of a state-supported communications agency promoting Renewable energies.