Environmental groups are raising the stakes for power companies facing allegations of coal-ash liability. Power plants that burn coal to produce electricity also create byproducts in the process, known as “coal combustion residuals,” or CCRs. CCRs go by several names, but are commonly known as “coal ash.” Historically, power companies have stored CCRs in settling ponds, also known as “coal-ash basins.” Coal-ash storage and disposal can lead to allegations of groundwater contamination and environmental contamination…