It may be appropriate cost wise to do an estimate of the monthly or yearly energy consumption of a system or a tenant instead of installing a meter. This may be the case when the tenant is a very small energy consumer or for a system or tenant where the consumption does not vary much months after months. Our expert can survey your site and make a estimate of the monthly consumption which will 85%-95% accurate. This survey will be backed-up by temporarily measurement of the actual consumption. As the consumption of a tenant or system may evolve with time, we suggest to repeat the estimate every 3 years. Our specialists can establish with you if it is best to install a meter or if an estimate of the energy consumption will be sufficient.