NERC's online spare equipment database (SED) is now operational. The inventory of spare equipment will be a helpful industry resource should a high-impact, low-frequency event result in damaged equipment. Providing information to the database is voluntary and meant to complement existing transformer sharing and mutual assistance agreements. The database is populated and managed by participating organizations bound by a mutual confidentiality agreement. NERC’s initial focus is on high-voltage transmission and generator step-up transformers, which are vital for operation of the integrated bulk power system.