Residential Measures for the
th
7 Power Plan
RTF
November 17, 2014
Source of Key Parameters
Parameter
Source(s)
Unit Savings at busbar (kWh)
RTF, DOE TSD, secondary sources
Incremental Cost ($/MWh)
RTF, DOE TSD, secondary sources
Baseline EE Saturation
RBSA, ENERGY STAR, secondary
sources
Number of Units (20 years)
Load forecast, RBSA, ENERGY STAR,
secondary sources
Achievable Technical Potential
(aMW over 20 years)
Product of # Units * Unit Savings
2
BATHROOM AERATORS
How to Estimate Savings?
 Most TRMs and Energy Trust base savings
on an algorithm
 ETO savings algorithm:
ΔGPM*% Max Flow*
usage/day/person*#persons*#days*
%HotWater*Δtemp*DHWeff
4
Need for Data
 % Max Flow: at what percent of maximum
flow does one generally set the faucet?
 usage/day usage: how many minutes per day
is the faucet running per person?
 % Hot water: what is the relative fraction of
hot to cold water used?
 Or, what is the average water temperature at
faucet?
 Should we include a sink-fill factor?
 What is the saturation of low-flow (<2.2
GPM) aerators out there?
5
7P Source Summary
Measure:
Aerators
Item
Methods & Sources
Measures Described
Energy Savings Calculation Basis
Applicable Stock
Baseline Saturation
Note
Faucet aerator for bathroom use, reducing GPM from
2.5 to 1.0
Based on engineering calculation using Energy Trust
Includes wastewater savings
blessing memo, Cadmus MI study
RBSA on electric WH saturation, # of bathrooms/home
Source of baseline saturation from
Seattle PUC Study of Market
ETO CPA assumes 65% saturation of measure
Penetration of Water Efficient
Fixtures, 2004 - no more recent
data available
Baseline HVAC Loads
NA
Permutations
Costs
Measure Life
Savings Shape
One only
ETO Blessing Memo
ETO Blessing Memo
DHW - ERWH
Achievable Ramp Rate
LO Medium (new), Retro in 10 (existing)
6
Aerators are a commonly used
water saving measure. ETO and
others have program, not RTF UES
ADVANCED POWER STRIPS
7
7P Source Summary
Measure:
Item
Measures Described
Energy Savings
Calculation Basis
Advanced Power Strips
Methods & Sources
Note
Power strips to switch off peripherals on home
entertainment or workstations when main component is
off
RTF
ResAdvancedPowerStrips_v1_5
Saturation increases over load
# of computers and TVs per home from RBSA, adjusted
Applicable Stock
foreacst, "powerstrip ready" from
for those that are "powerstrip ready"
ETO analysis ~5 years ago
low product awareness, but
Baseline Saturation low - 1%
programs have begun in 2012
Baseline HVAC Loads NA
Load sensing – computer or TV
Permutations
Load sensing, infrared, or occupancy
Infrared – TV only
Occ sensor – computer only
Costs
Various online sources
Measure Life
5
RTF assumption
Savings Shape
Res Electronics from RBSA
Achievability Ramp
Market evolving quickly, easy to
Rate
implement
LO Fast, Retro in 10
8
Advanced Power Strips
Parameter
Seventh Plan (draft)
Unit Savings at busbar (kWh)
34 (load sensing)
45 (occupancy)
284 (infrared)
Levelized Cost ($/MWh)
-$7 (occupancy)
$45 (infrared)
$226 (load sensing)
Baseline EE Saturation
1%
Number of Units (20 years)
30M
Achievable Technical Potential
(aMW over 20 years)
185

Number of units includes all TVs and Computers in homes, 34% feasibility
for SF (based on Energy Trust study); 25% for MF/MH (assumption)
9
Questions for RTF
 Are 300 kWh savings for infrared power
strips reasonable?
 How should savings be decremented to
account for increasing TV/computer
efficiency?
 Are there more recent data on applicability
of power strips to home entertainment or
home offices?
10
SINGLE-FAMILY
WEATHERIZATION
11
SF Weatherization
 Includes:
 Attic, floor, and wall insulation
 Windows
 Infiltration Control (not in 6P)
 Levels of insulation and associated savings
& cost taken from recent RTF workbook
 Number of units based on RBSA for 7P
 For 6P, based on pre-1980 vintage cohort
12
SF Weatherization
 RTF measures are by climate zone, HVAC
system type
 E.g. Insulate Attic - R0 to R38 - Heating
Zone 1 (Electric FAF)
 For 7P, RBSA data are not robust at this level
of granularity for baseline saturations
 In 7P, measures are bundled by HVAC
system type at regional level
 E.g. Insulate Attic – R0 to R38_Electric FAF
13
SF Wx Measures
14
Single-Family Weatherization
Parameter
Seventh Plan (draft)
Unit Savings at busbar (kWh)
35 - 2176
Levelized Cost ($/MWh)
$0 – 280
~$94 weighted avg
Baseline EE Saturation
Varies by measure
Number of Units (20 years)
2.3M
Achievable Technical
Potential
(aMW over 20 years)
100
15
7P Source Summary
Measure:
Single Family Weatherization
Item
Methods & Sources
Attic, floor, wall Insulation, window, and infiltration
improvements
Note
Energy Savings
Calculation Basis
SEEM models, RTF
ResSFWx_v3
Applicable Stock
Existing single-family homes
Baseline Saturation
Baseline HVAC Loads
Permutations
Costs
RBSA based on existing levels of insulation (grouped)
SEEM models
Various pre/post R/U/CFM50 values
ETO database
Measures Described
insulation at 45 years,
windows 25 yrs, infiltration 15
yrs
Measure Life
RTF assumptions
Savings Shape
HVAC Elec Resistance space heat - ELCAP
Achievability Ramp Rate
Wx programs have had long
duration
Retro in 10
16