Constellation Energy plans to purchase a 65-acre industrial landfill in Curtis Bay to dispose of fly ash, a by product of its coal-fired power plants in Pasadena, a company spokesman said yesterday.

The site at off Fort Armistead Road just over the Baltimore City line is owned by Millennium Inorganic Chemicals, which has applied to modify its permit to allow fly ash to be dumped at the site.

The plans concern Anne Arundel County officials and area residents who said Constellation and state regulators have left them in the dark.

They want to ensure proper precautions are in place to ensure the fly ash does not have a...