A game of strategy and foresight, Power Grid from Rio Grande Games requires patience and skill. The object of Power Grid is to supply the most cities with power once ones network gains a predetermined size. In this new edition, players mark pre-existing routes between cities for connection, and then bid against one another to purchase the power plants used to power their cities. However, as plants are purchased, newer more efficient plants become available. By purchasing at all, each player potentially allows others access to superior equipment. Additionally, players must acquire the raw materials, like coal, oil, garbage, or uranium, to power said plants (except for the highly valuable â€renewable energy†wind/solar plants). The game is a constant struggle to upgrade your plants for maximum efficiency, while retaining enough wealth to quickly expand your network along the cheapest routes.