N.Y.C. Admin. Code § 28-311.4: § 28-311.4 Monthly statements.

Each tenant or subtenant within a covered tenant space that has a sub-meter or sub-meters to measure electrical consumption shall be provided with a monthly statement showing the amount of electricity measured by the sub-meter for such tenant or subtenant during the month, and any amount charged to the tenant or subtenant for electricity. If the covered tenant space is a floor with multiple tenancies and the tenant's sub-meter covers other tenant spaces, the statement for such tenant shall show the electrical consumption for the area covered by the sub-meter and the percentage of that area that is leased by the tenant.