Energy Audit (Assignment-3)

 Energy Consumption Analysis of SRKI

Introduction

Electricity consumption analysis helps in understanding usage patterns and identifying wastage in institutions. This blog analyses the electricity consumption of SRKI College using selected monthly light bill data.

1.  Energy Consumption Pattern

Observation

The graph shows fluctuations in energy consumption, indicating that usage is not constant.

Additionally, there is a significant gap between the unit consumption in December 2023 and January 2024

Dec 2023 = 4122

Jan 2024 = 6070

Percentage increase (Dec → Jan):
Increase = 6070 − 4122 = 1948
Percentage = (1948 / 4122) × 100 = 47.25% increase

Ratio (Dec : Jan):
4122 : 6070 ≈ 2061 : 3035 ( ≈ 1 : 1.47)

Energy consumption in January 2025 is approximately 47.25% higher than in December 2024.

Dec 2024 = 5370 units
Jan 2025 = 6357 units

Percentage increase (Dec → Jan):
Increase = 6357 − 5370 = 987 units
Percentage increase = (987 / 5370) × 100 = 18.38% increased

Ratio (Dec : Jan)

5370 : 6357 ≈ 1790 : 2119 (≈ 1 : 1.18 )      

Energy consumption in January 2025 is approximately 18% higher than in December 2024.             

Reasons

Diwali vacations (only cause identified by me)

Since the institute is closed for Diwali vacations, the consumption dropped.

2. Monthly Average Energy Consumption

📅 2024 (Jul–Dec)

Units:
Jul 8777, Aug 10499, Sep 9142, Oct 5820, Nov 3467, Dec 5370

Total (2024) = 43,075 units
Average (2024) = 7,179 units/month

📅 2025 (Jul–Dec)

Units:
Jul 8673, Aug 9073, Sep 9517, Oct 4213, Nov 3963, Dec 5041

Total (2025) = 40,480 units
Average (2025) = 6,747 units/month

Conclusion

The average monthly electricity consumption in 2024 is higher than in 2025, indicating increased electrical load and academic activity during 2024.

3. Equipment Load vs Electricity Bill

Typically, it is not practical to calculate the total electricity consumption by counting and summing the power rating of every electrical appliance in a college, as the number of installed and operating equipment is very large and continuously changing.

However, an indirect and more realistic approach can be used. Based on the electricity bill analysis, the college operates for approximately 8 hours per day and consumes around 300 units (kWh) per day (6747 units / 23 days). This indicates an average energy consumption of 37.5 units per hour, which is equivalent to an average running load of 37.5 kW (37,500 watts) during operational hours.

If the total power rating of all major electrical equipment running at a given time (such as lighting, fans, computers, laboratory equipment, and air conditioners) is summed, the estimated load should be close to 37,500 watts. A close match would indicate that the electricity bill readings are reasonable and accurate.

Now let's compare it with the actual no of loads present in SRKI

No of eqipments

No of Fan and exhaust = 180-200

No of tube lights led = 230-250

Computers = 100-120 (not counted, just predicting)

Projects = 15-20 

Power ratting of equipments

Fans 65 watts

Tube lights led 20 watts

Computers 250W

Projector 250W 

Lift, incubators, and other equipment 7000W

Calculating energy consumption when it's at its peak

No of equipment * watt consumption

Fan 200*65 = 13000W

LED 250*20 = 5000W

Computers 120*250 = 30000W

Projector 20*250 = 5000W

Other 7000W

At peak load, it can consume up to 60 kWh (the sum of all equipment's watt consumption), which is 22.5 kWh higher than our average of 37.5 kWh.

Hence, a collage on average utilises 62.5% of its peak energy.

conclusion

Due to seasonal changes, the average energy utilisation becomes low compared to the maximum it can reach. For example, we can see in August 2024 and 2025, it is an all-time high because of the summer season. In other seasons, energy usage goes very low. One more reason could be the Diwali vacation, during which time the college operates at its lowest energy need.