More than three-quarters of U.S. oil wells, collectively, make just 6% of the country's oil. They're called marginal wells because of how small their output is. But they're a big deal.

This story was produced in partnership with the Pulitzer Center. It is part three in a four-part series. Read part one here ...

When a small company leased an oil field in California ... But the team discovered that it could use old oil wells for a different purpose: storing solar power. Renewable energy can be stored ...

Aging and abandoned oil wells in West Texas are causing significant environmental damage, public health risks, and financial ...

Nine million Americans live near an orphan oil and gas well. These wells have no owner and were never sealed, so they're leaking out tons of methane and deadly gases unchecked. Some are 150 years ...

An curved arrow pointing right. Oil wells from the Dutch colonial era lie scattered across Indonesia, polluting the earth and destroying locals' chances at making a living off anything but oil.

Oil companies need to stop delaying and avoiding their ... The largest operators will be required to plug 20% of their idle wells per year, while medium and small operators must plug 15% and 10% per ...

(North Dakota Monitor) – Nearly half of North Dakota oil wells now qualify for a tax exemption as low-producing wells, contributing to a reduction in tax revenue projections for the upcoming budget ...

Small and medium operators would have to meet lower requirements ... Previously, annual fees were as low as $150 per idle well. Oil production in California has declined more than 70% since 1985 and ...