Yielding 6.9 percent, PSXP is a midstream oil and gas company, meaning it helps transport, store and process fossil fuels before they’re sold to the consumer. Although recently hit by the oil sell-off, PSXP’s pipelines – which it collects tolls from regardless of oil prices – make it one of the best energy stocks to buy for 2019. ExxonMobil is currently topping the list of the biggest oil companies in the USA and one of the world’s largest oil companies by production. It is the largest publicly traded international energy company and uses technology and innovation to help meet the world’s growing energy needs. Total Energy: EIA, State Energy Data System, Total Energy Production. Crude Oil: EIA, Petroleum Supply Annual, Crude Oil Production. Natural Gas: EIA, Natural Gas Annual, Natural Gas Gross Withdrawals and Production. Coal: EIA, Annual Coal Report, Coal Production and Number of Mines by State.