EXHIBIT 21 SUBSIDIARIES OF REGISTRANTS IDACORP, Inc: 1. Idaho Power Company, an Idaho Corporation 2. Ida-West Energy Company, an Idaho Corporation 3. IDACORP Energy Solutions Company, a Nevada Corporation, doing business as Idaho Power Services 4. IDACORP Energy Solutions L.P., A Delaware Limited Partnership 5. IDACORP Energy Services Company, a Nevada Corporation 6. IDACORP Retail Enterprises Co., an Idaho Corporation 7. IDACORP Technologies, Inc., an Idaho Corporation 8. Northwest Power Systems LLC, an Oregon Limited Liability Company 9. Applied Power Corporation, a Washington Corporation (see note) 10. IDACORP Financial Services, Inc., an Idaho Corporation (see note) Idaho Power Company 1. Idaho Energy Resources Company, a Wyoming Corporation 2. Idaho Power Resources Corporation, an Idaho Corporation 3. Idaho Power Diversified Enterprises Company, an Idaho Corporation 4. Pathnet/Idaho Equipment, LLC., an Idaho Limited Liability Company Note: on January 1, 2000 ownership of this subsidiary was transferred to IDACORP, Inc.