Energy cooperatives are currently experiencing rapid growth, as they are strong purchasing communities that offer their members favorable rates. Based on the Renewable Energy Sources Act (EEG), these cooperatives are increasingly becoming energy producers themselves. However, they impose numerous requirements on management as well as legal and tax consulting. This book guides you through the establishment, management, and consulting of such registered cooperatives (eG). It clarifies suitable fields of activity, financing, and project management, and additionally provides practical checklists and case studies for successful actors at the local level. The 4th edition has been updated and expanded. It includes a foreword by Hans-Josef Fell.