OSHA regulation 29CFR1910.147 specifies control of hazardous energy requirements for the servicing and maintenance of machines and equipment in which the unexpected energization or start up of the machines or equipment, or release of stored energy could cause injury to employees. Class 3B and Class 4 laser beams must be considered hazardous energy sources because of the potential for serious eye injury; careful consideration is therefore needed to safely de-energize these lasers. This paper discusses and evaluates control of hazardous energy principles in this OSHA regulation, in ANSI Z136.1 Safe Use of Lasers, and in ANSI Z244.1 Control of Hazardous Energy, Lockout/Tagout and Alternative Methods. Recommendations are made for updating and improving CoHE (control of hazardous energy) requirements in these standards for their applicability to safe laser operations. Show Partial Abstract