Zimmer, Michael J. “Another Energy Problem: Growing Demand for ‘Reactive Power’ Challenges U.S. Transmission Systems”. Distributed Generation & Alternative Energy Journal 16, no. 4 (October 24, 2001): 57–60. Accessed May 14, 2026. https://journals.riverpublishers.com/index.php/DGAEJ/article/view/14557.