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Connecticut Small Business Energy Advantage Impact Evaluation Report

This report provides an evaluation of the Connecticut Small Business Energy Advantage program in 2007, including an overview, methodology, and results. It examines energy and demand savings, seasonal peak lighting analysis, and an air compressor project. Recommendations for improvement are also included.

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Connecticut Small Business Energy Advantage Impact Evaluation Report

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  1. Connecticut Small Business Energy Advantage Impact Evaluation ReportProgram Year 2007 Lauren Mattison October 21, 2009

  2. Agenda SBEA program overview Evaluation overview & methodology Evaluation results Energy & demand savings Seasonal peak lighting analysis Air compressor project Summary & recommendations

  3. SBEA Overview Direct install program, selected contractors act as single point of contact for customers Reported Savings in 2007

  4. SBEA Overview - Measure Types Lighting Upgrades Overhead Outdoor Exit signs Refrigeration case lighting Lighting Controls

  5. SBEA Overview - Measure Types Evaporator Fan Controls Turn off fans in walk-in cooler/freezer when thermostat doesn’t call for cooling Door Heater Controls Turn off door heaters in coolers and freezers when humidity is too low for condensation to occur Vending Machine Controls

  6. SBEA Overview - Measure Types Evaporator Fan Motor Upgrades High-efficiency electrically commutated motors in coolers/freezers Cooler Night Covers Retractable coverson open cases Custom Air compressor upgrade High efficiency motors

  7. Evaluation Objectives Evaluate attainment of program objectives for 2007 projects Determine adjusted energy and demand realization rates based on several adjustment factors Provide feedback to improve the programs

  8. Definitions Tracking estimate – reported savings Lighting: Gross tracking estimate – total reported savings for lighting projects Controls adjustment – reported savings for lighting controls measures Revised tracking estimate – reported savings for lighting equipment upgrades, excludes lighting controls

  9. Definitions – Savings Adjustments Documentation adjustment – difference between reported and calculated savings, determined by comparing reported savings to savings calculated from raw measure data Technology adjustment – difference between reported and installed equipment type Quantity adjustment – difference between reported and installed equipment quantity

  10. Definitions – Savings Adjustments Operation adjustment – difference between reported and metered operating hours Heating and cooling adjustment – impact of lighting measures on heating and cooling demand, this evaluation considers only electric impact which takes the form of a cooling credit Total adjustment

  11. Sample Selection Evaluation based on site visits and analysis of a sample of SBEA 2007 projects 121 sites 126 projects 94 CL&P projects + 32 UI projects Included 20 of the 40 projects with the highest annual energy savings Sample designed with goal of 80% confidence with 10% precision

  12. Sample Selection Sample Compared to Total Population Based on Total Energy Savings by Measure Type

  13. Site Visits Verified the type and quantity of installed equipment Installed meters Measured operating hours with lighting loggers Record light level in 10‑minute intervals Downloaded runtime data from refrigeration controllers Installed power meter on air compressor Used three meters per facility on average

  14. HOBO U12 Light Meters

  15. Analysis Calculated kWh and kW savings and compared to the reported values to independently determine each adjustment factor Extrapolate results to all projects to determine the total savings realized by SBEA projects in 2007

  16. CL&P Results – Energy Savings Total adjustment to lighting estimate excluding cooling: -2.27%.

  17. CL&P Results – Demand Savings Total adjustment to summer lighting estimate excluding cooling: -19.0%.

  18. CL&P Results – Demand Savings

  19. UI Results – Energy Savings Total adjustment to lighting estimate excluding cooling: +3.97%.

  20. UI Results – Demand Savings Total adjustment to summer lighting estimate excluding cooling: -34.0%

  21. Statewide Results – Energy Savings Total adjustment to lighting estimate excluding cooling: -0.882%.

  22. Statewide Results – Demand Savings Total adjustment to summer lighting estimate excluding cooling: -22.7%.

  23. Statewide Results – Demand Savings

  24. Statewide Results – Largest Adjustments to Savings Cooling - reduced cooling load with more efficient lighting 21% increase in lighting energy savings 30% increase in lighting demand savings Documentation - calculations that do not follow the formula in PSD 31-53% decrease in lighting demand savings 90% decrease in refrigeration demand savings

  25. Seasonal Peak Analysis Based on ISO New England 50/50 seasonal peak forecast Actual system load Lighting meter data Determined coincidence of upgraded lighting operation with times when actual system load exceeds 90% of the seasonal peak forecast level Winter 36% Summer 65%

  26. Air Compressor Upgrade One compressed air project in 2007 (CL&P) Options considered for replacing a 30 hp compressor: Baseline model: 91% motor efficiency High efficiency model: 91.7% motor efficiency, variable speed drive Cadmus metered new compressor for 3 weeks Found compressed air demand and energy consumption significantly lower than contractor estimates Compressed air demand is difficult to determine without metering, overestimates often cause inaccuracy in analysis Recommend metering and reevaluating compressor size in future air compressor project analysis

  27. Results – Single Air Compressor Project

  28. Summary Total realized savings for all 2007 projects: Annual energy savings 49,600 MWh Demand savings Winter: 6.2 MW Summer: 11.3 MW Most equipment found as reported, operating correctly, customers satisfied

  29. Recommendations – Program Savings Document (PSD) Continue efforts to keep PSD updated as new measures are added to program Enhance PSD savings formula for door heater controls Different default values for coolers and freezers

  30. Recommendations - Implementation Improve data collection with additional fields and more uniformity between two utilities Increase efforts to ensure that savings calculations are made according to the PSD formulas

  31. Recommendations - Implementation Meter selected measures, particularly air compressors, before project implementation to improve savings analysis Additional education and follow-up for refrigeration measures to help ensure that equipment is operating properly in the longer term

  32. Thank You Lauren Mattison The Cadmus Group, Inc. 617-673-7107 lauren.mattison@cadmusgroup.com

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