The two bar graphs illustrate the billion kilowatt-hours of electricity generated from the five categories of energy sources and sub-categories of renewable energy sources respectively within United States from 2009 to 2019.
From the first bar graph we can see that Coal and Petroleum had decreased in popularity, while Natural Gas, Nuclear, and Renewables increased. Additionally, Natural Gas became the most popular source of electricity by 2019. The second bar graph, which is on Renewable energy sources, shows a general upward trend in most of its sub categories.
In 2009, Coal was the most used source of electricity, with 1756 units of energy being generated, followed by Natural Gas, Nuclear, Renewables, and Petroleum which produced 921, 799, 437, and 57 units of energy respectively. In contrast, by 2019, Natural Gas became the most popular source of electricity, with 1582 units of generated energy, while Coal, Nuclear, Renewable, and Petroleum followed behind with 966, 809, 720, and 40 units of energy respectively.
All the Renewable energy sources except Hydroelectric shows a general upward trend. From 2009 to 2019, Solar and Wind energy sources soared from 1 to 73 units and 94 to 300 units respectively. While, Geothermal and Plant/Animal matter energy sources showed a meagre increase of 1 and 4 units from 15 and 54 units respectively. Hydroelectric energy source on the other hand showed no growth at 273 units.