Abstract: The environmental remediation required to permanently decommissionmost industrial projects is an expensive and irreversible investment. Real options literature shows that temporarily closing a project and postponing decommissioning has value when economic conditions are uncertain and future reactivation is possible. However, high decommissioning costs create an incentive to “temporarily” close a project, even when there is no intention to reactivate. This paper estimates a dynamic discrete choice model of closure to evaluate the likelihood of reactivation. The model reveals that the option to temporarily close is being widely used to avoid environmental remediation of oil and gas wells in Canada.