energies Article Power-to-Steel: Reducing CO2 through the Integration of Renewable Energy and Hydrogen into the German Steel Industry Alexander Otto 1,2, Martin Robinius 1,2,*, Thomas Grube 1,2, Sebastian Schiebahn 1,2, Aaron Praktiknjo 3,4 and Detlef Stolten 1,2,5 1 JARA-ENERGY, ...