Documentation of Custom Measure Costeffectiveness Parameters
Commercial/Industrial/Agricultural (C/I/A) Calculated Incentives Programs
Energy Savings Values
The C/I/A Calculated program savings are based on one aggregated forecast of savings and then split to
the three components as follows: 85% Commercial (3220), 10% Industrial (3231) and 5% Agricultural
(3237). The savings at the measure category level were based on goals for the entire program spread
to the individual categories or measure types based on historical data and program manager judgment.
The forecast was not done at the project level as the incentive rates are offered at the kWh/therm
level.
In the DR at page 2, ED asks SDG&E to provide “…..installation counts that represent the number of
project/measure installations expected each year not the number of kWh or therms expected to be
claimed each year.”
Since the forecast was not developed at a project level SDG&E’s response can only be hypothetical
based on average values of savings per project. To prepare this response, SDG&E calculated the
simple average savings per measure category from its 2011 Annual Report data that included the “Bid
Program” that is not being implemented in 2013-13. Then the savings from the C/I/A we programs
were aggregated to one set of values by measure category for the two year period. The aggregated
savings were divided by the historical average savings per project in each measure category to yield a
value. This value is SDG&E’s best answer to the DR inquiry into the estimated number of
project/measure installations. Since the values are for a two year period, SDG&E spread the
aggregated values to 2013 and 2014 using a 51/49% split based on the respective year’s goal.
Given the diversity of projects and the wide variance in the savings per project, SDG&E does not
consider these values part of its forecast. They are provided sole for the purpose of responding to this
DR. These values are listed below in Table 1.
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Table 1
Historical kWh
Historical
Savings per Therm Savings Simple Average
Project
per Project
Projects 2013-14
10,217
61.00
17,598
152.49
8,198
15.74
317,609
31.29
253,529
43.64
46,773
16.19
103,740
46.46
150,364
40.12
10,880
13.37
66,951
84.47
11,282
16.89
30,370
3.52
64,864
2.82
19,058
137.41
16,050
13.37
45,893
2.11
32,374
1.41
1,652
159.09
38,125
5.63
38,125
5.63
79,526
15.49
31,446
249.31
31,446
747.92
868,295
1.41
15,171
102.25
15,171
306.74
168,815
82.36
24,832
27.59
24,832
137.97
13,960
4.22
6,780
2.82
50,467
192.68
Measure Category
411021-Gas - Boiler Upgrades
411022-Gas - Process Other
411020-Gas - W/H Lg Storage
411002-HVAC - Chiller
411005-HVAC - Controls/Controlling Equipment
411006-HVAC - Energy Mgmt. System
411004-HVAC - Non Conditioned Space Ventilation
411007-HVAC - Other HVAC
411001-HVAC - Split & Packaged A/C units
411003-HVAC - VFD
409027-Lighting - Exterior Induction
409028-Lighting - Exterior LED
411019-Lighting - Exterior Lighting Controls
411018-Lighting - Exterior Lighting Fixtures
409024-Lighting - Exterior Linear Fl. Lighting
409025-Lighting - Exterior Pulse Start MH
411013-Lighting - Interior CF Fixtures
411015-Lighting - Interior CFLs
447260-Lighting - Interior LED
409031-Lighting - Interior LED - Dual Baseline
411016-Lighting - Interior Lighting Controls
447262-Lighting - Interior Linear Fixtures
411012-Lighting - Interior Linear Fixtures - Dual Baseline
409029-Lighting - Interior Pulse Start MH
447261-Lighting - Other Interior lighting
411017-Lighting - Other Interior lighting - Dual Baseline
411023-Misc. Custom Electric
447263-Motors - Non HVAC Motors (ER)
411011-Motors - Non HVAC Motors (ROB)
411008-Refrigeration - Compressor and Condenser Upgrades
411009-Refrigeration - Insulation
411010-Refrigeration - Other Refrigeration
2013
Value
29.89
74.72
7.71
15.33
21.39
7.93
22.77
19.66
6.55
41.39
8.28
1.72
1.38
67.33
6.55
1.03
0.69
77.95
2.76
2.76
7.59
122.16
366.48
0.69
50.10
150.30
40.36
13.52
67.61
2.07
1.38
94.41
2014
Value
31.11
77.77
8.03
15.96
22.26
8.26
23.69
20.46
6.82
43.08
8.62
1.80
1.44
70.08
6.82
1.08
0.72
81.14
2.87
2.87
7.90
127.15
381.44
0.72
52.15
156.44
42.00
14.07
70.37
2.15
1.44
98.27
For measures that have dual baseline, the percentage of second period savings relative to the first year
savings is documented in a spreadsheet entitled “DualBaselineFactors.xls”. In general, DEER values
and/or approved work paper ratios were followed.
For the purposes of forecasting KW and Therm values associated with electric measures, SDG&E used
historical KW/kWh and therm/kWh values. These values are provided in Table 2 below.
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Table 2
Measure Category
411002-HVAC - Chiller
411005-HVAC - Controls/Controlling Equipment
411006-HVAC - Energy Mgmt. System
411004-HVAC - Non Conditioned Space Ventilation
411007-HVAC - Other HVAC
411001-HVAC - Split & Packaged A/C units
411003-HVAC - VFD
409027-Lighting - Exterior Induction
409028-Lighting - Exterior LED
411019-Lighting - Exterior Lighting Controls
411018-Lighting - Exterior Lighting Fixtures
409024-Lighting - Exterior Linear Fl. Lighting
409025-Lighting - Exterior Pulse Start MH
411013-Lighting - Interior CF Fixtures
411015-Lighting - Interior CFLs
409031-Lighting - Interior LED
411016-Lighting - Interior Lighting Controls
411012-Lighting - Interior Linear Fixtures
409029-Lighting - Interior Pulse Start MH
411017-Lighting - Other Interior lighting
411023-Misc. Custom Electric
411011-Motors - Non HVAC Motors
411008-Refrigeration - Compressor and Condenser Upgrades
411009-Refrigeration - Insulation
411010-Refrigeration - Other Refrigeration
GrosskWhSavings
14,115,496
15,718,824
1,075,768
6,846,865
8,570,755
206,726
8,034,178
270,772
151,848
259,457
3,720,286
304,955
137,678
64,748
373,258
610,002
1,749,563
44,546,741
1,736,590
8,814,129
19,751,391
4,867,012
83,757
27,119
13,813,729
155,851,646
GrosskWSavings
1,596
1,339
8
667
700
115
451
3
2
529
26
14
54
75
21
7,515
334
1,088
2,071
480
9
3
1,527
18,626
KW/KWH
0.000113
0.000085
0.000007
0.000097
0.000082
0.000557
0.000056
0.000018
0.000008
0.000142
0.000084
0.000216
0.000145
0.000123
0.000012
0.000169
0.000192
0.000123
0.000105
0.000099
0.000106
0.000114
0.000111
0.000120
GrossThermSavings
5,942
177,057
14,533
63,553
14,093
575
38,136
2,184
17
316,090
Therms/KWH
0.000421
0.011264
0.013509
0.007415
0.001754
0.000013
0.001931
0.000449
0.000001
0.002028
Measure Costs (full & incremental)
SDG&E used historical customer reported cost as the basis for measure cost when possible/available.
SDG&E worked with the other IOUs to develop a common methodology to use historical project costs
to estimate a full and incremental measure costs. To be consistent, SDG&E tried to use either SCE’s or
PG&E’s values when SDG&E’s estimates seemed significantly different from the other IOUs. For gas
measures, SDG&E coordinated with SoCalGas. The values can be found in the Excel workbook entitled
“SDG&E Measure Cost IMC Data Summary.xls”
Measure Life (EUL & RUL Values)
SDG&E used the DEER EUL values and methodology posted on the DEEResorces.com website. For
measures with dual baseline, the RUL value was computed at 1/3rd of the EUL. The exception is linear
fluorescent lighting measures where the RUL was computed (20,000 hours/ 3180 hours)/3 = 2.096
years. The 3180 hours value is from the “Com” building type, for the “IOU” climate zone, which are
weighted averages.
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Net to Gross (NTG)
SDG&E used the NTG values posted DEEResorces.com website with the exception of the NTG values for
custom gas measures that where provided in D.12-05-015.
Savings by Design (Nonresidential New Construction)
Energy Savings Values
The Savings by Design program’s (SBD) energy savings are developed in a considerably different way
than the C/I/A calculated program. The “measures” or “measure category” are more modeling output
groupings from the building simulation models than deemed measures. In general, each project is
unique as the goal is to work with the design teams to change the design from a code design to a
design that exceeds code by varying percentages. Projects are at both the whole building level or at
the systems levels. The forecast was based on scaled values of historical savings by measure
In the DR at page 2, ED asks SDG&E to provide “…..installation counts that represent the number of
project/measure installations expected each year not the number of kWh or therms expected to be
claimed each year.”
Since the forecast was not developed at a project level SDG&E’s response can only be hypothetical
based on average values of savings per project. To prepare this response, SDG&E calculated the
simple average savings per electric or gas measure category from its 2011 Annual Report data. These
values are provided in Table 3 below.
4
Table 3
Measure Category
408031-Refrigeration Systems kWh Supermarket
408021-Interior Lighting Systems kWh
408006-Whole Bldg-Space Cooling kWh
408012-Whole Bldg-Heating Rejection kWh
408035-Other Systems kWh
408007-Whole Bldg-Lighting kWh
408009-Whole Bldg-Indoor Fans kWh
408028-Low SHGC Glass kWh
408044-Whole Bldg-Domestic Hot Water kWh
408024-HVAC Systems kWh
408018-Daylighting Systems kWh
408026-HVAC Systems Therms
408037-Other Systems Therms
408033-Refrigeration Systems Therm Supermarket
408034-Service Hot Water
408045-Whole Bldg-Domestic Hot Water Therms
408004-Whole Bldg-Peak Demand KW
408008-Whole Bldg-Space Cooling Therms
408005-Whole Bldg-Space Heating Therms
Historical kWh
Historical
Savings per Therm Savings Simple Average
Project
per Project Projects 2013-14
585,642
9
184,731
21
76,157
82
54,329
20
45,443
1
38,058
68
24,061
71
16,457
5
8,816
7
8,751
14
8,336
1
75
3.13
708,450
0.80
3,636
3.54
554
33.03
427
0.39
161
3,176
0.79
47.98
2013
Value
4.24
10.40
40.02
9.63
0.39
33.12
34.66
2.31
3.47
6.93
0.39
1.53
0.39
1.73
16.19
0.19
0.39
23.51
2014
Value
4.41
10.82
41.65
10.02
0.40
34.47
36.08
2.40
3.61
7.22
0.40
1.60
0.41
1.81
16.85
0.20
0.40
24.47
Measure Costs (incremental)
The measure cost for the SBD program is a rather difficult parameter to quantify for a number of
reasons. 1) Since there a number of ways to exceed the building standard the cost of doing that can
vary considerably based on the original design; 2) The cost of exceeding the building standard is not
expected to be linear - for example increasing the SEER of an air conditioner has a cost that increases
exponentially; 3) With re-design, there are often cost savings as well as additional costs; and 4) Since
the increases with the percentage over the building standard, SDG&E needed to use a value of
measure cost that is a not to exceed amount rather than a fixed value. SDG&E started with costs based
on work by Equipoise Consulting in October 2000. The values were altered to accommodate variable
incentives and changing costs. SDG&E believes that this is an area that needs additional study and
analysis. In February of 2008, The Heschong Mahone Group issued a white paper entitled
“Incremental Measure Cost in New Construction Programs”. While this is a few years old, SDG&E
believes that this is a good starting place for a study to develop incremental cost parameters. Moving
forward, SDG&E plans to work with the Energy Division and other IOUs to develop a methodology to
determine estimated incremental costs for the SBD program.
Measure Life (EUL & RUL Values)
SDG&E used the DEER EUL values posted on the DEEResorces.com website. Since SBD has broad
categories, SDG&E used conservative or most common/applicable values from the list for the particular
category. For example, the “Whole Building” categories, SDG&E used 15 years, while most of the
bigger saving measures have EULs of 20 years.
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Net to Gross (NTG)
SDG&E used the NTG values posted DEEResorces.com website.
California Advanced Homes
Energy Savings Values
The California Advanced Homes (CAH) program’s energy savings were developed in a similar manner as
the SBD program. The forecast was done by scaling the 2010-2011 results to meet the goal for the
program. The “measures” or “measure category” are more modeling output groupings from the
building simulation models than measures in a deemed program. In general, each project is unique as
the goal is to work with the design teams to change the design from a code design to a design that
exceeds code by varying percentages.
In the DR at page 2, ED asks SDG&E to provide “…..installation counts that represent the number of
project/measure installations expected each year not the number of kWh or therms expected to be
claimed each year.”
Since the forecast was not developed at a project level SDG&E’s response can only be hypothetical
based on average values of savings per project. To prepare this response, SDG&E calculated the
simple average savings per electric or gas measure category from its 2011 Annual Report data. These
values are provided in Table 4 below.
Table 4
Measure Category
406023-Thermostatic Valve and 1.6 GPM SH SF *
406024-Thermostatic Valve and 1.6 GPM SH MF*
406028-Space Heating Therms
406029-Space Cooling kWh
406030-Space Cooling KW
406032-Indoor Fans kWh
406037-Domestic Hot Water Therms
406041- Energy Star Bonus
* - note these are deemed values
Historical kWh
Historical
Savings per
Therm Savings
Project
per Project
21
29
53
898
183
80
Simple Average
Projects 2013-14
100
40
577.36
621
197
720.00
2013
Value
282.91
304.48
96.39
352.80
Measure Costs (incremental)
The measure cost for the CAH program is a rather difficult parameter to quantify for a number of
reasons. 1) Since there a number of ways to exceed the building standard the cost of doing that can
vary considerably based on the original design; 2) The cost of exceeding the building standard is not
6
2014
Value
100.00
40.00
294.45
316.90
100.33
367.20
expected to be linear - for example increasing the SEER of an air conditioner has a cost that increases
exponentially; 3) With re-design, there are often cost savings as well as additional costs; and 4) Since
the increases with the percentage over the building standard, SDG&E needed to use a value of
measure cost that is a not to exceed amount rather than a fixed value. Moving forward, SDG&E plans
to work with the Energy Division and other IOUs to develop a methodology to determine estimated
incremental costs for the CAH program.
Measure Life (EUL & RUL Values)
SDG&E used the DEER EUL values posted on the DEEResorces.com website. Since CAH program has
broad categories, SDG&E used conservative or most common/applicable values from the list for the
particular category. For example, the “Space Heating” categories, SDG&E used 18 years, while most of
the bigger saving measures have EULs of 20 years.
Net to Gross (NTG)
SDG&E used the NTG values posted DEEResorces.com website. Since the CAH program measure
categories encompass a large number of DEER measure categories, it is difficult to determine the
appropriate NTG value. SDG&E believes that the correct value should be a weighted average a set of
DEER NTG values somewhere in the middle of the value for EUC and the default. When populating the
E3 dataset, the link in the forecasting system grabbed the wrong value and selected a value of 0.36 for
room A/c units. SDG&E intended to select a value of 0.55 as a conservative value for the forecast filing.
SDG&E will work with Energy Division to determine the appropriate value to use.
Energy Upgrade California
Energy Savings Values
Energy Upgrade California (EUC) program’s energy savings were developed based on median values for
the completed homes in the 2010-11 program. The individual site level savings are based on model
simulations. From the 200 homes that in the program database, the median kWh, KW and therm
savings are 625 kWh, 0.50 KW and 143 therms.
Measure Costs
The program data list self-reported project cost with a mean and median of $12,234 and $10,120, respectively.
The project cost data has a significant amount of variance. The standard deviation of the data equals $7,729. In
addition the median incentive from the EUC program was $2,000. Given the above, SDG&E believed that the
mean and median project cost values are not a reasonable representation of the cost of the measures
associated with the savings. SDG&E used a value of $4,000 as the measures cost. This value was selected
because it seemed more reasonable that a residential customer would pay about ½ of the cost of the energy
saving measures.
7
Measure Life (EUL & RUL Values)
SDG&E used a measure life of 20 years as the measures in the EUC program are long-lived measures
such as insulation, furnaces, etc.
Net to Gross (NTG)
SDG&E used the NTG value posted DEEResorces.com website for EUC.
8