Sub-metering in master-metered buildings simplifies billing and brings brighter prospects for energy efficiency. Most co-op and condo owners in New York City are either directly metered by ConEd, or already sub-metered. However, there is still a small percentage of buildings that are master-metered. Those buildings need to install sub-meters before January 1, 2025 to comply with Local Law 88.    Read the article………………………..