Total, OPEX and CAPEX costs in the Dutch Distribution System.

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Total, OPEX and CAPEX costs in the

- Operating expenditure plus tangible depreciation

where operating expenditure includes the following cost items: materials, services, wage costs and other costs.

Most of the uncontrollable cost items (e.g., charges to other network operators, or purchases of energy) were eliminated from the cost base and the level of remaining uncontrollable costs was minimal. The costs associated with the performance of transmission activities were removed from the analysis.

Outputs

Since model selection could not be based upon econometric tests, Frontier Economics employed combinations of the following output variables:

- Electricity distributed (kWh)

- Number of consumers (total, small and large)

- Network length

- Transformer numbers

- Network density.

Frontier Economics requested input from the businesses to identify environmental factors that may affect the efficiency scores and to provide relevant data on these so that the impact of environmental factors on the efficiency scores could be tested.

Frontier Economics noted that insufficient data were available to incorporate variables such as peak demand and service quality.

3.2. Models specification

This section describes the various DEA models estimated by Frontier Economics. All the models were estimated under both Constant Returns-to-Scales (CRS) and Variable Returns-to-Scale (VRS) specifications.

Model 1 is a simple model with only two potential cost drivers (units distributed and customer numbers). It was noted that these are key outputs for any distribution and supply business.

Model 2 is similar to Model 1, but attempts to capture differences in the composition of customer base by splitting the number of consumers into two groups...

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...nt very low DEA scores (which may have reflected positive cost shocks) from leading to very high X factors.
- The use of international comparators: Most regulators have tended to limit themselves to domestic comparators, particularly for distribution companies where the number of companies is generally greater, e.g. Norway where there are around 180 regional companies and Netherlands where there are 19, as this eases problems associated with data comparability. As is shown in the figure below the decisions of the Regulator authorities can vary a lot depending on all the context to measure the right remuneration.

Other real life problems with the use of DEA by the BTe can be shown somehow in the next figure.

http://www.accc.gov.au/system/files/Regulatory%20practices%20in%20other%20countries%20-%20Benchmarking%20opex%20and%20capex%20in%20energy%20networks.pdf

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