20.50.02.06

.06 Life-Cycle Cost Analysis to Guide the Purchase of Liquid-Immersed Distribution Transformers.

A. Scope. This regulation does not apply to an electric cooperative that supplies electricity to fewer than 60,000 electric meters in the State.

B. Purchase of Liquid-Immersed Distribution Transformers.

(1) Beginning January 1, 2009, a utility shall use the life-cycle cost methodology contained in NEMA Standards Publication TP 1-2002, which is incorporated by reference under COMAR 20.50.02.02, when selecting any liquid-immersed distribution transformer for purchase.

(2) Evaluation of Distribution Transformer Models.

(a) Within each capacity class or type of liquid-immersed distribution transformer, a reasonable number of commercially available models shall be evaluated, and, except as provided §B(2)(b) of this regulation, a utility shall select for purchase the model in each capacity class or type with the lowest total owning costs as determined by the life-cycle cost methodology.

(b) If a utility is soliciting bids to supply multiple capacity classes or types of liquid-immersed distribution transformers under a single contract, models offered by a supplier in more than one capacity class or type may be combined for purposes of life-cycle cost evaluation.

(c) A utility shall select for purchase the aggregation of models offered by a supplier in the combined classes or types with the lowest total owning cost as determined by the life-cycle cost methodology in §B(2)(b) of this regulation.

(d) Under this section, a utility shall use:

(i) The values for load losses and no-load losses as determined by the "Uniform Test Method for Measuring the Energy Consumption of Distribution Transformers", Appendix A to Subpart K of 10 CFR Part 431, as amended, which is incorporated by reference; and

(ii) The estimated value of energy and capacity from the most current year available at the time of any bid solicitation.

C. This regulation does not require a utility to purchase any liquid-immersed distribution transformer that fails to meet federal energy efficiency standards specified in 10 CFR Part 431, as amended, which is incorporated by reference.