The monetary impact for this once off occurrence is high, however it is easy to reduce this impact if you take control of your peak demand. This can be done with a system that has combined its energy management and building management systems. The ability to control your peak demand requires these two systems working simultaneously. Your energy management system will be monitoring you main incoming meter, which will advise your instantaneous demand. While your building management system will be running your building plant to whatever the current conditions require. Without these 2 systems talking to one another there is no way to control your peak demand. Having the capability for both these systems to communicate is extremely powerful, and allows you to control your peak demand. Once a system starts to see you reach a percentage of your desired peak, it can start adapting the operations of your building to immediately reduce your demand. This need only last for a short time, and once the demand reduces it can then return your building to normal operation.
If your building has demand limiting, instead of one moment in a month or year affecting your bills, you can control this moment and greatly reduce the effect it will have on your operating expenses. Demand limiting has the ability to reduce loads via your building management system, whether it be a binary point (on/off) such as a fan, motor or lighting or an analogue point (modulating point) such as VFD fan speed or compressor loading. Because peak demand can occur over a short time, whatever is turned off or ramped down, is only in this reduce state for a short period of time. For example, you may have multiple AC units turning on one floor, which is increasing your demand, so you can turn off your toilet exhaust fans for a few minutes while these units start up. Once they have started up, and your demand has returned to a normal state, your exhaust fans turn back on automatically. This will have zero impact on your tenants, but will have a large impact on your monthly bills. Another example would be to reset your chilled water supply temperature up half or full degree which in turn unloads the chillers compressor for a short period, then return to automatic modulation once the building load has steadied. Again this will have minimal impact on your occupants but a significant impact on your monthly bills.
Optergy is a system that can be used as a combined building automation and energy management system. It can be used from project inception, or added to a legacy building automation or energy management system. With built in applications Optergy can be used to manage the demand of your building automatically without your tenants noticing any change in building conditions. The only change you will notice is the reduction in electricity costs.