Persistence of customized commercial and industrial non-lighting energy efficiency installations
This paper describes the methodology and results of a study of the persistence of savings from a large New England electric utilities' non-lighting customized energy efficiency installations. Measures, which were installed 2 to 3 years prior to the study, included commercial and industrial refrigeration, process, process cooling, HVAC, compressed air and comprehensive multi-end-use designs. Persistence was assessed through a review of billing records and program files, telephone interviews and on-site visits. Unlike most studies of persistence which assess persistence primarily through measure retention, this study paid particular attention to re-estimation of savings using the same algorithms as the original estimate of savings. Results of a simple billing analysis were used to develop a telephone survey sample of 100 projects. To strengthen the information developed from the telephone surveys, on-site studies were conducted for 26 of the 100 phone-surveyed sites. Results for these 26 sites were used to calibrate the results of the phone survey-based savings calculations using a double ration method. The analysis option which showed the lowest relative precision produced realization rates of 1.024, 0.997 and 0.953 for kWh, summer kW and winter kW respectively. The relative precisions for these results ranged between 6 and 13%. Lessons learned included the higher than expected persistence from larger, more complex efficiency measures, the cost savings and precision improvements associated with the use of less expensive phone surveys and a smaller number of more expensive on-site surveys and the importance of customer production output on savings persistence.
- Research Organization:
- NEES Companies (US)
- OSTI ID:
- 20002696
- Report Number(s):
- CONF-980815-; TRN: IM200002%%696
- Resource Relation:
- Conference: 1998 ACEEE Summer Study on Energy Efficiency in Buildings, Pacific Grove, CA (US), 08/23/1998--08/28/1998; Other Information: 10 volume set available for $200.00; PBD: 1998; Related Information: In: 1998 ACEEE summer study on energy efficiency in buildings: Proceedings, [3100] pages.
- Country of Publication:
- United States
- Language:
- English
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