OSHA is enforcing NFPA 70E in spirit, not to the letter. That is, several sections of the OSHA general industry and construction standards address protection against hazards such as arc flash, shock, burns and fire. See
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=25540 or
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=25557
That second one says, "The General Duty Clause is not used to enforce the provisions of consensus standards, although such standards are sometimes used as evidence of hazard recognition and the availability of feasible means of abatement." But that doesn't mean they won't use it if someone gets hurt.
It's interesting that when OSHA updated the the general industry standards on electrical in 2007, they updated only installation standards, and didn't touch training, work practices, use of equipment or PPE (1910.331 through .335), and said they chose to base the update on the 2000 edition of 70E, not the 2004, which had the big arc flash protection changes. And, they haven't touched the construction industry standards, which are based on the 1979 70E.
My point is, from an OSHA standpoint, don't worry about keeping the Energized Electrical Work Permits, because they're not required by OSHA. It's more important that you USE a permit than that you keep it.