The object of Power Grid is to supply the most cities with power when someone's network gains a predetermined size. Players mark routes between cities for connection, and then vie against other players to purchase the power plants that you use to supply the power. However, as plants are purchased, newer more efficient plants become available so you're potentially allowing others to access to superior equipment merely by purchasing at all. Additionally, players must acquire the raw materials, like coal, oil, garbage, or uranium, to power said plants (except for the highly valuable 'renewable energy' wind/solar plants), making it a constant struggle to upgrade your plants for maximum efficiency while still retaining enough wealth to quickly expand your network to get the cheapest routes. Power Grid includes two maps: USA and Germany.