The European Service Module supplied air and potable water for the astronauts, generated electrical power through its four solar arrays, provided thermal control in the harsh environment of space, and propelled Orion over 1 million km through deep space. Mostly built by European industry under ESA leadership, the European Service Module was assembled by Airbus Defence and Space in Bremen, Germany, with contributions from companies across 13 European countries, involving 20 main contractors and over 100 European suppliers.