Building Index is an essential tool for cost-effective operation of buildings and facilities and is a modernization and new investment planning for determining strategic goals for energy efficiency. The top product of Building Index is the building control. The energy management system of buildings is automated for collecting consumer data and summary and it may be suitable for the building's energy consumption per meter, per regulate consumer, but also for the entire building. For thoes customers who interested in integrated and compared data of buildings and facilities these systems can provide up to date consumption data with online customized format and visualization. The integration of renewable technologies gives more benefits and can bring multiple indicator improvement. With installing a simple or small investment like solar panels or indoor lighting upgrade can be achieved major energy savings. To increase the renewables allows energy efficiency and global sustainable development. They don't make pressure on the environment and decrease the primary energy demand. Beside the measured energy data we can get other information too. Other than ordinary consumption of the equipments may indicate the timeliness of maintenance or improper set point adjustment. Further optimization tweaks are increasingly being used in an environment where local power generator and low energy consumers are more and more common.