PSE Mobile Home Efficiency Program

Treat 5,000 units in 2010 and 2011

Projected Composition:

• 4,700 electric forced air

• 400 with AC

• 300 with gas heat

Program MeasuresMEASURE AFFECTED FUELS SAVINGS RANGE NOTES

CFL Electric 150–300 kWh/yr

Showerhead / Aerators

Electric or gas DHW 0-200 kWh/yr or 0-20 therms/yr

Program Duct Repair

Electric or gas heat & electric AC

Highly variable 0-2,000 kWh/yr or 0-100 therms/yr

Combining PTCS and prescriptive repairs

Special Duct Repair

Gas and electric heat & electric AC

Highly variable Evaluating alternative duct test and sealing options

Education All energy uses Adjunct to all savings but no explicit savings assumed

Primary propane or wood heat customers ineligible

3 Increasing Levels of Duct Repair

• Duct Seal Level 1 - Prescriptive Visual Sealing including visual check of crossover, with pressurization QC check

• Duct Seal Level 2 – If level 1 pressurization check shows remaining high leakage, locate and seal air leaks while under pressurization

• Duct Seal Level 3 – Replace ducts that are beyond repair

Results of Similar ProgramModeled on Snohomish PUD Mobile Home Program w/1,600 participants

Normalized Savings Distribution - full analysis sample

0%

5%

10%

15%

20%

25%

-6500 -5500 -4500 -3500 -2500 -1500 -500 500 1500 2500 3500 4500 5500

Center of Savings Bin, kWh/yr

Fra

cti

on

of

Sa

mp

le

Based on billing analysis of 572 sites. Standard deviation about 2000 kWh/yr.

Proposed Evaluation Overview

Impact Evaluation

Billing analysis on all participant sites, one year pre/post data

Multi-fuel sites use EZ SIM, all-electric sites use regression model

Sites stratified by treatment classification:

1. No treatment

2. Prescriptive duct sealing

3. 3 levels of duct sealing and repair

Control group of 500-1,000 sites drawn from past participants with same pre/post program years

Control group considered important in current economic climate

Analysis Details (1)SITE DATA COLLECTION

• Site Address• Site utility reference number electric, gas• Site analyses internal reference number• Single, double or triple wide• Site contractor• Site auxiliary heat• Site conditioned square footage• Site treatment date• Site measures applied and removed• Site pressurization measurements• Site showerhead flow• Site special duct repair indicator and measurements

Analysis Details (2)Typical analysis results – results from the more complex dual fuel

analysis are illustrated

Predicted and Actual Billings

0.00.51.0

1.52.02.53.03.5

4.04.55.0

30 40 50 60 70 80 90 100Mean Monthly Temp, Deg F

No

rmal

ized

Po

wer

, W

atts

/ft2

PredictedElectricity

Predicted Fuel

Actual ElectricBills

Actual Fuel Bills

Monthly Fuel BillsNormal Weather Year

0

50

100

150

200

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

ther

m/m

onth

Current Bills

With Conservation