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.
Grain products are the leading source of carbohydrates in the American diet. Grains naturally contain high concentrations of starch, which your gastrointestinal system breaks down into sugars. Common grains in the U.S. diet include wheat, oats, rice, barley and cornmeal.Amaranth, buckwheat, triticale, spelt, sorghum, quinoa, millet, farro, bulgur and grano are also sources of dietary carbohydrates.arbohydrates account for more than 50 percent of the calories in the average American diet, according to the U.S. Department of Agriculture. Most dietary carbohydrates come from plants.