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Smart metering in Santiago de Chile

2016-03-16

In the 1980s, Chile became a world pioneer when it introduced a series of reforms in the regulation of electricity. The objective of these reforms was to introduce market principles in the sector, so that society could benefit from greater efficiency. 

The regulation – which was visionary for its time – maintained a reactive role, changing only when there were supply crises. This is why, in recent years, a series of regulatory modifications tending to reactivate the sector were introduced. However, this same sector was strongly affected due to a lack of investment and a high dependence on a fuel no longer available, Argentine natural gas.

These crises motivated a thorough search for energy resources that could ease the system in the short term and avoid the problems of tightness of supply. It is here that a resource used in other countries becomes more valuable, energy efficiency. Yet this efficiency is not obtained overnight. The current metering technology for end consumers does not allow promoting a more efficient level of consumption. The introduction of new metering technology, widely used and proven in other countries, would allow users to adapt their energy requirements on the basis of flexible pricing signals, which in turn would lead to important benefits for society. This article reviews some of the analysis being carried out with respect to the introduction of smart meters in Santiago de Chile.

THE CHILEAN ENERGY MARKET
The Chilean energy market is made up of the classic activities of generation, transmission and distribution of electricity – all provided by private companies. The state acts as both a regulator, dealing with the legislative concepts, norms and regulations of the different activities, and as a supervisory agent, supervising the various agents, guaranteeing both participating companies and consumers their rights and responsibilities.

The generation of electricity has been established as a free competition activity, while transmission and distribution are subject to fixed prices, due to the monopolistic condition originated by the existence of economies of scale in transmission and economies of scope in distribution.

In addition, Chilean regulation incorporates another tariff element which is subject to regulation by the authorities: the price of electricity for distribution companies’ regulated clients, i.e. the denominated node price. This price is calculated every six months by the Chilean National Energy Commission (CNE) and represents the expected value of the marginal costs of electricity over a period of 48 months. However, the character of this price, as it was calculated by the authorities, was modified in 2005 with the Ley Corta II. This Act introduced a mechanism of bidding for the adjudication for the electricity supply between generators and distribution companies for loads subject to price regulation. As a result, the node price will be defined by the outcome of the tenders, and is now named the “long term node price.”

The structure of the regulated tariffs for final clients that use less that 2 MW is made up, in general terms, by the following elements: 

  • The node price, with its components of energy and power
  • Distribution added value (VAD), which corresponds to the payment for distribution
  • Unique tariff for the use of the trunk system, which basically corresponds to a charge per kWh, unique and fixed for every client, and allows access to the transmission system.

Ninety-nine percent of consumers in Santiago are residential clients and small businesses, who are charged tariff BT1. BT1 has a mono-term structure, where only energy is measured, and on the basis of which the consumed peak power is determined.

SMART METERING 
The majority of electricity consumers in Chile either have or rent electromechanical meters so that their electricity bill can be calculated over a determined period of time. The reading of this type of meter is carried out manually, usually monthly.

The incorporation of smart meters has come about with the need to give price signals to users so as to allow them to modify their consumption, thus allowing to optimal the use of the resources, both at the generation level in terms of costs and emissions, as well as in the networks, minimising the investment required to supply peak demand by flattening the load curve.

There are different architectures and technologies available to communicate between meters and companies, the most adequate of which, in technical-economic terms, is the power line carrier. A review of the international literature, in particular of cost-benefit analyses of large scale smart meter deployments from different countries, results in a range of costs shown in Table 1. These costs depend on the scale of the installation and also on the technology used, among other factors. As can be seen, typical costs are around US$100 per point with communication capability.

INSTALLATION OF SMART METERS IN SANTIAGO 
A non-trivial problem at the time of carrying out the deployment of a new metering system is related to the size of the area that is to be covered. The trend in developed countries is to perform full-scale smart metering deployments, covering all consumers of distribution companies. Even though the installation of millions of meters is monetarily very costly, it is socially profitable due to a massive consumer response to direct and indirect efficiency incentives. However, one should note that the energy requirements of customers in developing countries is dramatically lower compared with developed countries that have opted for a massive deployment of new metering technologies. This could anticipate a lower demand response, whereas developing countries’ consumers present a smaller slack in their energy consumption requirements.

Figure 1 shows that the energy requirements of Chilean consumers, mainly residential consumers, are radically lower in comparison with countries that have opted for massive deployment, suggesting a lower response from national consumers. It is clear that the countries that have studied or implemented new metering technologies have, at least, more than twice the per capita consumption of Chile.

San1
Figure 1: Consumer energy consumption in selected countries

Customers’ georeferenced monthly energy consumption data during 2007 was provided by Chilean distribution utility Chilectra. Due to lack of more detailed information, certain assumptions were made in order to identify potentially more demand responsive customers and areas for optimal smart meter deployment. It was assumed that a certain area is more convenient if:

  • Customers’ consumption levels inside it are at least one standard deviation above total average. These customers have a consumption level that would provide a greater slack, compared with a low consumption client, probably only supplying its basic energy needs.
  • Monthly consumption variability within the year is above total urban population average in at least one standard deviation. High monthly variability would provide greater room for demand reductions.

The use of spatial statistical analysis techniques allows a better understanding of the information contained on known coordinate points, especially the spatial relationship between these points’ features; for example, if groups of items or customers with similar attributes are concentrated. In this case, one wants to determine if clients with the described characteristics are bundled together, in what is commonly called a cluster. This would constitute an attractive zone for the deployment of smart meters.

To identify the existence of these clusters, autocorrelation functions were applied to the geo-referenced data. Positive autocorrelation indicates that similar data is found clustered. Figure 2 shows the results of low voltage urban clients using a 500 x 500 metre grid. The existence of a direct relation between the average monthly consumption (left) and the monthly variability (right) of these consumers in the year is shown.

With the previous analysis, a tentative zone of installation was defined based on the road network. For this, the borders of the polygon of installation were drawn through relevant avenues of the eastern sector of Santiago, as shown in Figure 3.

COST OF INSTALLATION AND BENEFITS 
The main variables in the costs that have been identified in international experiences are the costs related to the investment and installation.

San2
Figure 2: Monthly average consumption (left) and monthly variability (right)

Investment costs 
The main component corresponds to the cost of the meters themselves. Average values observed in studies and international experiences have been taken. Similarly, maintenance costs of the equipment, failure rates and, in general, all those costs that are not known in the country due to little experience in these matters, are considered.

San3
Figure 3: Borders of the polygon of installation

Costs of installation 
Labour data:

  • The labour time required to change a meter is 40 and 80 minutes for single and three phase meters, respectively.
  • Installation crews are conformed by an officer and two assistants with a work vehicle brand Hyundai, model H100 Porter (gasoline) and work equipment with an annual cost of approximately US$16,000. In addition, supervisor participation is recognised, who is in charge of supervising five installation crews.
  • A monthly target of 5,000 installations was assumed, considering 7 working hours a day and 20 working days per month, aiming to complete the deployment in 3 years.

Transport data:

  • Crews’ working vehicle average speed is assumed to be 30 km/hr.
  • A warehouse located at the distribution company’s main office is considered, which constitutes the departure point of installation crews. The distance between warehouse and installation cells is assumed as the largest direct distance, i.e. the sum of distances along X and Y axis. The installation zone was divided by a 500 x 500 m grid.
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