U.S. Department of Energy - Energy Efficiency and Renewable Energy

Building Technologies Program – Appliances and Commercial Equipment Standards

Distribution Transformers Determination Analysis

In October 1997, the Department of Energy determined, based on the best information currently available, that energy conservation standards for distribution transformers are technologically feasible and economically justified, and are likely to result in significant energy savings. This determination initiated the process of establishing test procedures and energy conservation standards for this product.

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Notice of Determination

• Notice of Determination, Federal Register, October 22, 1997 (PDF 69 KB)

Supporting Documentation

• Determination Analysis of Energy Conservation Standards for Distribution Transformers, ORNL-6847 - The Oak Ridge National Laboratory (ORNL) report dated July 1996, which supported the Determination (PDF 9.1 MB)
• Supplement to the 'Determination Analysis' (ORNL-6847) and Analysis of the NEMA Efficiency Standard for Distribution Transformers, ORNL-6925 - A revised ORNL report dated September 1997, which assessed the suggested efficiency levels contained in the then newly published NEMA Standards Publication No. TP1-1996, "Guide for Determining Energy Efficiency for Distribution Transformers." (PDF 1.1 MB)