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A new study by the National Academy of Sciences urges federal regulators to conduct an “interim evaluation” of the federal medium- and heavy-duty truck Phase 2 greenhouse gas and economy rule with an eye toward more stringent standards.

U.S. pipeline giant Energy Transfer agreed to acquire rival operator SemGroup Corp. for about $1.35 billion in a stock and cash deal, building out billionaire Kelcy Warren’s empire even as investors demand financial discipline.

The days when energy stocks and the price of oil moved in lockstep are now few and far between. In Canada, it’s the worst divergence on record.

SACRAMENTO, Calif. — A coalition of 22 Democratic-led states sued the Trump administration Aug. 13 over its decision to ease restrictions on coal-fired power plants, with California’s governor saying the president is trying to rescue an outdated industry.

Within 20 years, oil use will have long since peaked, renewables and natural gas will account for about half of energy supply and the cost of keeping the lights on will plummet. But that still won’t be enough to meet climate goals, according to a forecast from energy and maritime services company DNV GL Group AS.

One of Oklahoma’s fastest-growing companies, Mammoth Energy Services, continued to expand in the second quarter, buying up two more companies and securing new contracts throughout the country.

U.S. crude producers are still set to pump record amounts of the commodity next year, but less so than previously projected, according to the latest government estimates.

Royal Dutch Shell, the oil company that spent more than $50 billion to buy natural-gas producer BG Group, is looking to expand demand for the fuel in transport to ensure its output is consumed.

Mark W. Clemons Trucking, a U.S. Postal Service carrier, has named Clean Energy Fuels Corp. its preferred provider for compressed natural gas fueling services in Arizona and California.