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Source: RPV Electrical September 2007
Figure: 4 – A magnetic card strip is inserted on the prepaid meter to
energize the office appliances
The load operates intermittently and it depends on how
much power is drawn by office appliances from the
sub-feeder line. To determine the equivalent prepaid
denominations to be purchased by each tenant from the
landlord, the energy usages and average operating costs
relative to the rate cost of energy2 of each tenant were
evaluated based on Table 1. The average energy usage per
day of Travel Agency Company is calculated at 20.32Kwhrs
while the Law firm and Engineering firm’s office are
38.52Kw-hrs and 7.62Kw-hrs per day. The Law Firm’s
office has an EEC per day of around and Php7,507.50 for
24-day office work while the Travel Agency Firm has an
average EEC per day of around Php152.40 and equivalent
monthly energy cost of Php3, 962.24 in 24 days while
the average energy equivalent cost (AEEC) per day of
Engineering Firm’s office is Php57.1 or Php1,485.90 in
Table:1 – Typical Electrical Load Appliances of
Tenant Offices
Table: 2 – Energy Cost Data Summary of Tenant’s Office
24-working days. These energy costs were correlated
with the average energy usage (AEU) to exhibit the
prepaid denominations. Based on historical energy usage
data, each tenant can estimate prepaid denominations.
(i.e. 5Kw-hr has an estimated denomination of PhP37.50
or 100Kw-hr for Php630.50) 2 Based on Local Power
Distributors Commercial Rate Basis @ P7.50 per KW-HR
(Ave. Rate)
Conclusion
TECHNICAL PAPER
Prepayment system of electricity through prepaid submeters
with energy user card provides advantages and
economic benefits to the building owners, tenants, and
even to the local power distributors where effective
control and management of energy consumption is
THE ELECTRICAL ENGINEER MAGAZINE 3RD QUARTER 2010 31