A building installed a modern BMS five years ago and measured large energy savings during the first year of operation. Five years later, consumption has crept back almost to the pre-BMS level even though the system is still operational and no sensors have failed. The most likely explanation for this drift is:

Question

Accepted Answer

Manual overrides have accumulated, so much of the building now runs against operator adjustments rather than the original rules.

Answer

The BMS software has become infected with malware that silently disables the energy-saving rules during normal operating hours.

Answer

The BMS has reached the end of its designed service life and the entire system must now be replaced with a newer generation of equipment.

Answer

The regional electricity grid has shifted toward cleaner sources, and this generation-mix change has automatically raised total consumption.

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A building installed a modern BMS five years ago and measured large energy savin...

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