With three essays, this dissertation provides new insights into the economics and future development of vehicle-to-grid (V2G) business models. The term V2G captures the concept that electric vehicles (EVs) provide energy services while connected to the grid. The first essay discusses how contract parameters between aggregators and EV owners influence the profitability of the concept. The second essay develops a spot market balancing strategy to make V2G economically feasible. The third essay focuses on consumer preferences for V2G products.