You should by now have had a Carbon Trust sponsored energy survey performed on your site; if not, then get one done immediately. Carbon trust surveys

The survey will most likely recommend that additional sub-metering should be installed.

The C3 metering survey will produce a written metering strategy and action plan. Our standard metering survey includes:

• Division of site into EAC's (Energy Accounting Centres)
• Survey of all existing meters (Main and Sub-meters)
• Identification of metering method for non-metered loads (direct, hours run, indirect, difference)
• Assessment of potential locations for the new meters.
• Assessment of requirements for automatic meter reading and data analysis systems.

Surveying your existing metering and developing a future sub-metering strategy is an essential first step towards improved energy management.