kW must be used with Power profile values. kWh must be used with energy profile values (ImportEnergy,ExportEnergy,ImportMeterReading,ExportMeterReading). The average active power during ISP, considering both import and export energy. Power=(ImportEnergy-ExportEnergy)*(60/ISP-Length-Minutes). For example with a 15 minute ISP length we have a multiplier of 4, with a 30 minute ISP length we have a multiplier of 2. Including the power profile is recommended. It is expected that in the following major version the power will become a mandatory value. Imported active energy, consumed during the ISP Exported active energy, generated during the ISP Cumulative metered imported active energy reading, at the end of the ISP Cumulative metered exported active energy reading, at the end of the ISP The message must contain one or more profiles with metering, energy or price values. Revision of this message. A sequence number that must be incremented each time a new revision of a metering message is sent. ISO 8601 time interval (minutes only, for example PT15M) indicating the duration of the ISPs referenced in this message. Although the ISP length is a market-wide fixed value, making this assumption explicit in each message is important for validation purposes, allowing implementations to reject messages with an errant ISP duration. Time zone ID (as per the IANA time zone database, http://www.iana.org/time-zones, for example: Europe/Amsterdam) indicating the UTC offset that applies to the Period referenced in this message. Although the time zone is a market-wide fixed value, making this assumption explicit in each message is important for validation purposes, allowing implementations to reject messages with an errant UTC offset. ISO 4217 code indicating the currency that applies to the price of the Tariff Rates. Only required if ImportTariff or ExportTariff profiles are included. Day (in yyyy-mm-dd format) the ISPs referenced in this Metering message belong to. EAN of the meter the message applies to. A profile carries a sequence of ISPs with a defined type of metering data Number of the ISP this element refers to. The first ISP of a day has number 1. Metering, energy or price value at the end of this ISP, in the designated profile units.