Kirby, Brendan, and Eric Hirst. “How Energy Customers Can Help Electric Utilities N Ow User ‘Load’ Can Be a Resource for Utilities’ Ancillary Services”. Distributed Generation & Alternative Energy Journal 14, no. 3 (June 15, 1999): 24–38. Accessed May 14, 2026. https://journals.riverpublishers.com/index.php/DGAEJ/article/view/14681.