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Producers Connection

Connection Process

The network connection process for facilities under the special regime comprises six stages ending in the billing process:

The stages in the process under the Special Regime differ depending on whether the facilities are governed by Royal Decree 1699/2011 of 18 November, which regulates the network connection of small-scale power stations, or by Royal Decree 661/2007, which regulates electricity generation under the special regime.

Production Facilities under Ordinary and Special Regimes

Ordinary regime electricity generation relies primarily on conventional technologies employed at power plants harnessing energy from coal, fuel oil, natural gas, combined cycles, nuclear, etc.

The procedural steps to take for connecting facilities under the Special Regime are contemplated in two Royal Decrees:  RD 1699/2011 and RD 661/2007.

Royal Decree 1699/2011 applies to the following facilities:

  • Facilities under the special regime with a rated power of under 100 kW and using the technologies contemplated in categories b), namely solar, wind power, geothermal, wave, hydropower or biogas) and c), namely facilities employing waste as a primary energy source with a power assessment not contemplated in category b), when connecting to:
    • a) Power lines no greater than 1 kV, fed either directly to the distribution network or through the consumer’s internal grid.
    • b) On the low-voltage side of a transformer for an internal grid, at a voltage of less than 1 kV, for a consumer connected to the distribution network and provided that the installed power generation connected to the network is no greater than 100 kW.
  • Facilities under the special regime with no greater than 1,000 kW of power from the technologies contemplated in article 2 of Royal Decree 661/2007 of 25 May, namely category a), producers employing cogeneration or other forms of electricity generation from waste, and subgroups b.6, waste biomass; b.7, biomass/biogas from manure and sewage; and b.8, biomass from industrial processing, and which connect to distribution utility power lines whose capacity does not exceed 36 kV, whether fed directly or through the consumer’s internal grid.

The process for connecting the remaining types of facilities under the Special Regime is contemplated in Royal Decree 661/2007.

The requirements and procedures that producers must follow to connect to the network are summarised below:

Promoter application

  • The promoter or developer, where pertinent, shall file a guarantee with the corresponding Regional Authorities (Autonomous Community).
  • The promoter shall then contact the distribution utility to request the connection point, doing so by sending an email to Acometidasproductores@iberdrola.eswith the corresponding application form and the documentation indicated in the form (listed in the section “Technical Documentation”).
  • The distribution utility will then forward the report and requirements for the connection point.
  • The promoter shall in turn notify the distributor of the acceptance of the report and requirements for the connection point.

Approval of the project by the Autonomous Community

  • The developer, when applicable, will request administrative authorization of the Autonomous Community and present the basic project and execution program.
  • The developer will present to the distributor a copy of the request for administrative authorization and proof of the presentation unto the Autonomous Community of the basic project and execution program.
  • Lastly, the developer will present to the distributor the administrative authorization and project approval granted by the Autonomous Community.

Project execution

The promoter implements the project.

Connection to the network

  • The distributor will issue a connection contract, certificate of meter reading if the installation's power is less than or equal to 450 kW, and a certificate of access and connection.
  • The developer remits to the distributor proof of start-up or the electrical installation certificate, and request connection to the network.
  • The distributor executes the installation's connection to the network.


Installation of Metering Equipment

  • Metering equipment may be owned by either the developer or the distributor. Iberdrola Distribución Eléctrica provides the option of renting this equipment (except equipment connected to L.V. installations with a power exceeding 15kW).
  • Installations having a power greater than 15kW are required to be equipped with remote control meter reading equipment (telemetering).
  • Iberdrola Distribución Eléctrica shall inspect and seal the metering equipment.

Application of Royal Decree 1565/2010

Royal Decree 1565/2010 dated 19th November, which regulates and modifies certain aspects related to the production of electrical energy under special regime states the following in article three, one, a):

Type I. Installations that are located on roofs or facades of consolidated buildings that are closed, made of resistant materials, dedicated to residential use, services, commercial or industrial use, including those for agricultural purposes and, in any case, when the interior is provided with a power supply point under contract for at least 25 per cent of the rated power of the installation to be installed during the first twenty-five years counting from the first day of the month following the commissioning of the production installation.

Invoicing: New Payment Procedures

In 2009 diverse legislation which modified payment procedures for energy entered into effect as of November 1, 2009, affecting relations and operations with distributors (Seventh additional provision of Royal Decree 485/2009 of 3 April. Exclusive additional provision of Royal Decree 1011/2009 of 19 June. Circular 4/2009, of 9 July, of the National Energy Commission).

  • Representation in the market:
    • Installations which prior to October 31, 2009 were represented in the market by Iberdrola Distribución Eléctrica and had not notified their desire to be represented by another party are represented by IBERDROLA Comercialización de Último Recurso, S.A.U. as of 2009 November 1. (IBERCUR).
  • Payment of energy transferred to the Network:
    • Iberdrola Distribución Eléctrica has paid pay for energy transferred to its network prior to October 31, and will continue to assume payments for energy transferred up to that date as regards concepts related with regularization and new invoices.
    • Payments for energy transferred as of 2009 November 1 are made by the National Energy Commission or by the new representative.
  • Representation in the market and Network feed-in payment:
    • As of 1 November 2009, distribution utilities no longer handle feed-in payments or market representation.
  • Metering equipment readings:
    • Iberdrola Distribución Eléctrica remit to the National Energy Commission monthly the meter readings of installations of type III and V (installations with a power capacity less than or equal to 450 kW), for which it assumes responsibility for the readings.
    • The System Operator (REE) is responsible for sending the meter readings for equipment of types I and II (installations with a power capacity greater than 450 kW).
  • Contact and clarifications:
    • For any additional clarification or information on the functioning of the payment system for the special system bonuses, contact the National Energy Commission through its website, or through your representative.
    • For matters concerning metering or claims on measurement readings, Iberdrola Distribución Eléctrica has a website available exclusively for representatives: Productores de Régimen Especial (Special Regime Producers). To request further clarification or explanation, please contact: or call 902 10 11 66, indicating “Special Regime”.
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