The provided line graph illustrates data from a 2008 account about energy usage in the USA since 1980, with forecasts until 2030. Units are measured in quadrillion.
Overall, fossil fuels have been the prevalent type and will continue this trend into the future. Nuclear and renewable energy followed more stable patterns, though both experienced minor fluctuations; it is predicted that they will continue to do so.
Looking at the details, regarding petrol and oil, it began at 35 quadrillion units (35q) in 1980. After that, it witnessed a slight rise to approximately 40q in 2008, and this trend is expected to continue with a projected figure of nearly 50q in 2030. In 1980, natural gas ranked second at 20q, while coal followed closely in third place with about 16q. However, coal outpaced natural gas in 1990, and despite some minor downs, it is likely to be the second most used fuel in 2030 with just over 30q. It is expected that natural gas will level off and it is going to remain constant at about 25q.
Nuclear and renewable energies represented at the same level around 4q in 1980, after which they saw a slight fluctuation until 2008. It is anticipated that nuclear energy will reach 10q by 2030 and solae/wind around 5q, with hydropower dropping slightly and then remaining constant at about 2q.