Understanding how sub-metering benefits multifamily residential owners by providing information at a local level, enabling building occupants and tenant agencies to identify smarter decision about their energy use.

1. Benefit Assessment Plan:
Sub-Metering Buildings
Understanding how sub-metering benefits multifamily residential
owners by providing information at a local level, enabling building
occupants and tenant agencies to identify smarter decision about
their energy use.

2. Goals of the Analysis
Uncover energy hogs; accurate knowledge of where energy is being consumed
is the first step in creating energy savings.
To provide economic incentive recommendations to homeowners (if possible).
Understand the benefit of installing sub-metering devices to justify its cost.

3. Process Framework

4. Data Overview
Individual power consumption data gathered between December 2006 and November 2010
Measurement of electric power consumption in one household with a one-minute sampling
rate in three connected sub-meters.
Over 2 million instances with about 26K (1.25%) missing data with only date and timestamp.
Submeter 1 Submeter 2 Submeter 3
Main Meter

5. Data Processing
Import Data
Cleanse Data
(handle missing and
not so useful values)
Prepared Data after iterative
transformation until helpful evaluation
Pattern helps
gaining InsightTransform Data
(Data Wrangling and Munging)

7. Initial Insights from the Household Electricity Consumption
0 5 10 15 20 25
Global Active Power
Submeter 1
Submeter 2
Submeter 3
Night Morning Afternoon
Morning power consumption is
highest due to the use of water
heater (AC likely to be not so
much in use during this period of
the day)
Submeter 1
(Kitchen)
12% Submeter 2
(Laundry)
15%
Submeter 3 (AC and
Water Heater)
73%
Electricity consumed by air conditioner
and water heater is three times
more than total consumption
of kitchen and laundry together.
Total power
consumption as well
as for individual
submeters it is
observed that
average electricity
consumption is
lowest in summer
highest in winter.

8. Benefit of Installing Submeters
Looking at data looks like morning consumption of submeter3 is due to the use of water heater.
Ideally AC usage in summer should ideally be higher during afternoon but data shows other ways.
Separate submeter or at least data related water heater would help to see clearer picture. Using
timer may help in energy saving. Introducing dynamic setpoint for HVAC that will help to adjust
depending on outdoor temperature.
Recommendation for Home Owners
 Electricity expenses make up a large part of budget, and it’s rising. Control costs by empowering
residents to manage their own usage. It’s a win-win situation.
 Curtail load by determining which equipment may be turned down for lower energy
consumption.