Page 212 - Sustainable Cities and Communities Design Handbook

186 Sustainable Cities and Communities Design Handbook

The first summation in the B p equation should be used for C&LM pro-
grams. For fuel substitution programs, both the first and second summations
should be used for B p .
Note that in most cases, the customer bill impact terms (BR t ,BI t , and AB at )
are further determined by costing period to reflect load impacts and/or rate
schedules, which vary substantially by the time of day and season. The for-
mulas for these variables are as follows:
I I
X X
BR t ¼ ðDEG it AC: E it K it Þþ ðDDG it AC: D it K it Þþ OBR t
i¼1 i¼1
AB at ¼ BR t formula, but with rates and costing periods appropriate for the
alternate fuel utility
I I
X X
BI t ¼ ðDEG it AC: E it ðK it 1ÞÞ þ ðDDG it AC: D it ðK it 1ÞÞ þ OBI t
i¼1 i¼1
where

DEG it ¼ Reduction in gross energy use in costing period i in year t
DDG it ¼ Reduction in gross billing demand in costing period i in year t
AC:E it ¼ Rate charged for energy in costing period i in year t
AC:D it ¼ Rate charged for demand in costing period i in year t
K it ¼ 1 when DEG it or DDG it is positive (a reduction) in costing period i in
year t, and 0 otherwise
OBR t ¼ Other bill reductions or avoided bill payments (e.g., customer
charges, standby rates)
OBI t ¼ Other bill increases (i.e., customer charges, standby rates)
I ¼ Number of periods of participant’s participation.
In load management programs such as TOU rates and air-conditioning
cycling, there are often no direct customer hardware costs. However,
attempts should be made to quantify indirect costs that customers may incur
that enable them to take advantage of TOU rates and similar programs.
If no customer hardware costs are expected or estimates of indirect costs
and value of service are unavailable, it may not be possible to calculate the
BCR and discounted payback period.

THE RATEPAYER IMPACT MEASURE TEST (REFER TO POINT
5 OF NOTES)

Definition
The RIM Test measures the effect on customer bills or rates of changes in
utility revenues and operating costs caused by the program. Rates will go down
if the change in revenues from the program is greater than the change in utility