natural gas & oil. Duke Energy operates a system of generating plants fueled by oil or natural gas, including combustion turbines, combined-cycle units and oil-fired units. Combustion turbines. Many of our combustion turbine units are used to supplement power supply during peak demand periods when electricity use is highest.
Carbohydrates are a type of macronutrient found in many foods and beverages. Most carbohydrates are naturally occurring in plant-based foods, such as grains. Food manufacturers also add carbohydrates to processed foods in the form of starch or added sugar.Common sources of naturally occurring carbohydrates include: 1  Fruits. 2  Vegetables.3  Milk. 4  Nuts. 5  Grains. 6  Seeds. 7  Legumes.ood manufacturers also add carbohydrates to processed foods in the form of starch or added sugar. Common sources of naturally occurring carbohydrates include: 1  Fruits. 2  Vegetables. 3  Milk. 4  Nuts. 5  Grains. 6  Seeds. 7  Legumes.
Simple Sugars. Simple sugars are another characteristic of carbohydrates. Also called monosaccharides, simple sugars include fructose, glucose and galactose. Fructose is often found in fruit, whereas galactose is found in milk. Both are converted to glucose by the liver. Glucose is the body's energy source.omplex Carbohydrates. Carbohydrates also are characterized by the presence of complex carbohydrates. Complex carbohydrates are composed of chains of sugar linked together. Amylose is a common sugar found in complex carbohydrates.