1. Portable Classroom Controls Project Chuck Collins RCM Meeting April 27, 2007

2. The portable classroom Time clock User control Electric heating No scheduling capability Electric heat pumps No A/C Exhaust fans Limited windows No demand charges

3. Part of PSE rebate program for schools List of eligible equipment Variable rebate amounts depending on which pieces of equipment installed Application for rebate Rebate amount is close to cost of controller

4. Portable classroom control project process Project research (cost/benefits, other data) Make pitch to organization Rebate application, work with PSE early Find a contractor to do the work Commence with project Set up temperature set-points, times, etc Verify avoided costs, consumption Receive rebate

5. The Project 127 portable classrooms Upgraded thermostat controller Connected to District DDC through network Control setpoints via DDC system Can verify temps, setpoints, trends, etc Ability to remotely shut down all portables Scheduling, snow day, etc

6. After-project analysis using PSE’s EIS March 2005 through February 2007

7. Weekly analysis shows weekend shutdown Feb 24, 2007 through April 24, 2007

8. Daily profile 2005: High peak, runs during night hours First week of March, 2005

9. Daily profile 2006: Systems running 24/7 First week of March, 2007

10. Daily profile shows lower demand, lower night consumption First week of March, 2007

11. Avoided electricity calculations Mar 2005 –Cost - $75.22 –kWh – 942.26 Mar 2006 –Cost - $182.72 –kWh – 2,391.50 Mar 2007 –Cost - $62.97 –kWh – 766.45 942.26 + 2391.50 2 = 1,666.9 – 766.45 = 900 kWh per year or 54%

12. Avoided cost calculations Mar 2005 –Cost - $75.22 –kWh – 942.26 Mar 2006 –Cost - $182.72 –kWh – 2,391.50 Mar 2007 –Cost - $62.97 –kWh – 766.45 $75.22 + $182.72 2 = $128.97 - $62.97 = $66.00 per year or 51%!

13. Avoided cost survey 18 portables at various sites (14% of total) Used PSE’s Energy Interval Service for data Total electricity cost March 2006: $2,468.39 Total electricity cost March 2007: $1,854.49 Avoided monthly cost for sample: $613.90 x 10 months: $6,139.00 annual avoided cost / 18 portables = $341.05 per portable, per year x 127 portables = $43,314.05 (estimated annual avoided cost, based on survey)

14. Total cost/benefit Estimated annual savings: $43,314 Total project cost: $110,642 Simple payback (no rebate): 2.6 years PSE rebate: $29,750 Actual project cost: $110,642 - $29,750 = $80,892 Simple payback (with rebate): 1.9 years

15. Thank you!! Questions??