Turkey’s quest for a reliable and affordable network of energy suppliers has informed key policy decisions in the fields of natural gas, oil, coal, nuclear power, and renewable energy. This goal has had an impact on the way Turkey interacts with its regional partners and rivals—and on the country’s security at large. To preserve its energy networks, over the years, Ankara has consolidated relations with its largest supplier of hydrocarbons—Russia— and scaled up energy diplomacy efforts with smaller, energy-rich neighbors including Azerbaijan, Iran, and Iraq.