List of Acronyms BAU Business as Usual CBI Cross-border import CGS City gate stations DA Day-ahead DC Direct current DOE Department of Energy Dth Dekatherm (equal to 1 mmBtu) EC Economic dispatch EIA Energy Information Administration FERC Federal Energy Regulatory Commission GCV Gross calorific value GFPP Natural gas-fired power plants GNS Gas not supplied ID Intra-day IEEE Institute of Electrical and Electronics工程师IID协调ISO独立系统运营商JISEA战略能源分析的总数电力流RT实时RTO区域传输组织SDGE圣地亚哥天然气和电动TSO传输系统运营商UC单元承诺UC单位承诺和经济调度UGS UGS地下气体存储VO&M可变操作和维护