July 12, 2012. Royal Dutch Shell Plc, Europe's biggest oil company, received conditional approval from Alberta's energy regulator for a carbon capture and storage project planned north of Edmonton. A panel concluded it's in the public interest for Shell's Quest project to move ahead. The site is suited to long-term carbon-dioxide storage, and the proposal mitigates potential risks. Quest is designed to capture and permanently store underground more than 1 million tons of the greenhouse gas a year from the Scotford upgrader near Fort Saskatchewan, Alberta, Shell said. Quest is moving ahead on behalf of the Athabasca Oil Sands Project, of which Shell has a 60 percent stake and Chevron Corp. and Marathon Oil Corp. each control 20 percent.