You won't need a converter or adapter, as the electrical current in Guatemala is 110 volts, the same as in the United States. Outlets in both countries take U.S.-style plugs. Power surges are fairly common, so consider carrying a surge stabilizer if you travel with expensive electrical items, such as a laptop. In a few remote areas lodges and hotels may generate their own electricity. After the generators are turned off at night, light comes only from kerosene lanterns or your flashlight.