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Electricity Pricing to U.S. Manufacturing Plants, 1963-2000

October 2007

Working Paper Number:

CES-07-28

Abstract

We construct a large customer-level database and use it to study electricity pricing patterns from 1963 to 2000. The data show tremendous cross-sectional dispersion in the electricity prices paid by manufacturing plants, reflecting spatial price differences and quantity discounts. Price dispersion declined sharply between 1967 and 1977 because of erosion in quantity discounts. To estimate the role of cost factors and markups in quantity discounts, we exploit differences among utilities in the purchases distribution of their customers. The estimation results reveal that supply costs per watt-hour decline by more than half over the range of customer-level purchases in the data, regardless of time period. Prior to the mid 1970s, marginal price and marginal cost schedules with respect to annual purchase quantity are remarkably similar, in line with efficient pricing. In later years, marginal supply costs exceed marginal prices for smaller manufacturing customers by 10% or more. The evidence provides no support for a standard Ramsey-pricing interpretation of quantity discounts on the margin we study. Spatial dispersion in retail electricity prices among states, counties and utility service territories is large, rises over time for smaller purchasers, and does not diminish as wholesale power markets expand in the 1990s.

Document Tags and Keywords

Keywords Keywords are automatically generated using KeyBERT, a powerful and innovative keyword extraction tool that utilizes BERT embeddings to ensure high-quality and contextually relevant keywords.

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:
demand, econometric, market, sale, cost, monopolistic, price, tariff, expenditure, pricing, consumption, electricity, wholesale, rate, retail, disparity, utility, electricity prices

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:
Department of Commerce, National Science Foundation, Annual Survey of Manufactures, Service Annual Survey, Center for Economic Studies, Bureau of Economic Analysis, Energy Information Administration, University of Chicago, Manufacturing Energy Consumption Survey, Journal of Economic Literature, Geographic Information Systems, Business Register, State Energy Data System

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