If you need to change the power of light that have contracted know that:
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According to the RD 1955/2000, the consumer may request power down only 1 time per year.
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Installation must comply with current regulations. This is,you should have ICP (Interruptor de Control de Potencia), and meet the technical standards and safety regulations.
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If the installation has more than 20 years, the distribution company may request a review and the relevant certificates.
The change in power has a cost that will feed into the customer's bill. Since February 2014, the cost of modification is € 9.044. If one were to review a facility for having a history of more than 20 years, the cost is € 8.01.