Evaluate EEMs - Value, Cost, Complexity
No cost measures: Once metering was installed across the campuses, the energy team were able to clearly see the operational schedules of different buildings and systems. The first set of measures were the no-cost measures, which included standardizing of operational schedules for different locations, improvement in operational sequencing for equipment (particularly in air conditioning systems). These were the low hanging fruit and did not require any capital investment. The savings were clearly visible, they got all the stakeholders excited about energy savings and helped to get a lot of confidence with the senior management. No cost measures paved the way for investments in further efficiency measures.
Low cost measures: This was the second step, which included replacing small equipment like pumps, installing thermostats and timers for electrical panels (to schedule the major equipment on/off). This gave the second level of energy savings in the buildings.
Major retrofits: These required redesigning the air conditioning plant, replacing redundant Un-interruptible Power Supplies from buildings with high efficiency modular UPS systems. These measures required major investments, and the energy savings were very significant, often leading to a payback of less than 3 years. The deep green retrofits in air conditioning and UPS systems have helped reduce the electrical connected load by about 25 MW across campuses in four years.
Results: The cumulative savings over seven years have been impressive. As well as drastically reducing per capita energy consumption, and avoiding about 890 Million kWh, average energy consumption in new buildings has been to 80 kWh per square meter of floor space per year. Construction cost for energy efficient new buildings was no higher than before and the average return on investment for retrofit projects was less than three years.
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