When they were invented in the ’90s, renewable energy certificates were meant to stimulate the green energy market. Back then, building wind and solar farms was way more expensive than it is today. The idea was that renewable energy producers could sell certificates that represented the “greenness” of the energy they made. Anyone buying those certificates, or RECs, could claim that green power and also claim they were helping the environment.

For years, corporations have bought RECs as a low-commitment way to claim they’re “going green” – all while using the same old fossil fuel-powered electricity.

Reveal’s Will Evans starts with Auden Schendler, the man in charge of sustainability at Aspen Skiing Co. Schendler initially convinced his company to buy RECs to go green, then realized he made a mistake. But even after he spoke out and evidence piled up showing that RECs were ineffective, other companies kept buying them – and the federal government did, too. Evans and Reveal’s Melissa Lewis determined that since 2010, more than half of what the government has claimed as renewable energy was just cheap RECs.

Next, Reveal’s Najib Aminy takes us to Palm Beach County, Florida, to find out where some RECs are made: in a trash incinerator. Amid all the sounds and smells of burning garbage, Aminy looks into whether buying RECs actually helps the environment and where the money goes. He meets Andrew Byrd, who lives nearby and worries about the fumes. It turns out that federal agencies bought RECs from this incinerator in order to meet renewable energy mandates.

Finally, we explore another place where the government buys  RECs: two biomass plants in Georgia, where residents complained of toxic pollution. Evans looks into where the government’s modest environmental goals come from and why federal agencies buy RECs in the first place. He also talks to a REC industry veteran and examines how a plan from the Biden administration could change things.