Low-voltage supplies 

All the information needed for managing low-voltage supplies 
Useful Iberdrola information for Companies and Institutions: low-voltage supplies

Service connection, Contracting ...

  1. Service connection: What is a service connection?

    It is the part of the installation between the distribution grid and the main fuse box or boxes for low-voltage supplies.

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  2. Service connection: What is testing?

    This is an inspection and check of the regulatory conditions and technical features of a customer's installation before connecting to the mains.

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  3. Service connection: What does connecting to the mains mean?

    It is the process of connecting to the distribution company's installations and providing an electricity service.

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  4. Service connection: What are service connection charges?

    These are a cash consideration payable to distribution companies for extending and making the grid accessible for new supplies or upgrading existing ones under current regulations.

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  5. Service connection: What are testing charges?

    These are a cash consideration payable to distribution companies for testing installations, which must meet the regulatory technical and safety conditions (RD 1955/2000, section 50).

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  6. Service connection: What are mains connection charges?

    These are a cash consideration payable to distribution companies, where applicable, for connecting to the mains (RD 1955/2000, section 50).

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  7. Service connection: What are extension installations?

    Extension installations are those that are needed to provide a new supply or to extend an existing one from the existing installations.

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  8. Service connection: What is an extension investment?

    It is for extension installations.

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  9. Service connection: When do service connection charges have to be paid?

    Extension charges are paid by the applicants when they already know how much this item costs, before the connection is made.

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  10. Service connection: Are these charges attached to the installation?

    Only in the case of extension charges already paid, are they attached to the installations, homes, premises, plots, etc. for which they were paid, until the first user disconnects the power, irrespective of how much time has elapsed.

    From a customer’s cancellation date or in the event of a decrease in power, only the extension charges will remain attached to the installation for a further three years for low-voltage power supplies.

    Access charges are not considered to be attached.

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  11. Service connection: How much does a user have to pay for connection charges?

    On signing up for electricity supply for a house, premises, etc., the customer or end user will have to pay the necessary access charges for the contracted power to the distribution company, as long as it does not exceed the power acknowledged for the installation. If the customer or end user were to sign up for more power or extend the already contracted power, he or she would also pay the required extra for the access and extension charges for the increase in power.

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  12. Service connection: Should the local council cover part of the connection application costs?

    No, unless the local council is the developer.

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  13. Service connection: Who should fit the extension installations?

    The distribution company that has to provide a new supply or extend an existing one will be required to provide the electrical infrastructure needed whenever the supply is located on urban land that is deemed to be a buildable site up to a requested power of 50 kW for low-voltage supplies and 250 kW for medium-voltage supplies.

    When the extension installation exceeds the aforementioned power limits, the applicant will pay for the required extension installation, without the distribution company charging the extension fee.

    When the supply requested is for urban land that is not buildable, the owner must pay for the completion of the required electrical infrastructure for it to become buildable.

    On buildable land, the owner must pay for the required electrical infrastructure, including the off-site supply feed network and the necessary reinforcements.

    In the case of non-buildable land, the applicant will pay for the electrical infrastructure for the supply, thus acquiring the status of owner of the installations.

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  14. Service connection: How long does the power company have to advise on the technical and commercial terms for a service connection?

    The deadlines for a written response, counted in working days, for low-voltage supplies are as follows: 

    • When a transformer station is not required, 20 days.
    • Final service with a medium-voltage transformer station, 60 days.
    • Final service with a medium to high-voltage transformer station, 90 days.
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  15. Service connection: For how long are the service connection technical and commercial quotes valid?

    Three months from the date of communication of the quote.

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  16. Service connection: Were the applicant to carry out the civil work for the connection by his own means, what permits would be needed?

    Depending on the type of works to be carried out they can be: 

    • Municipal permit for prospecting pits and conduits.
    • Municipal permit for transformer station works.
    • Third-party permits for building the designed installation.
    • Approval from the supply company of the extension installation project to be carried out, as it must meet its officially approved regulations.
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  17. Service connection: Once the connection charges have been paid to the electricity company, what are the deadlines?

    The deadlines, counted in terms of 10 workdays from the time of connection of the installation, once the service connection charges have been paid for low-voltage power supply, are as follows: 

    • If a low-voltage extension is not carried out: 10 days.
    • If only a low-voltage extension is required: 50 days.
    • Third-party permits for building the designed installation.
    • If a transformer station needs to be built: 90 days.
    • If several transformer stations need to be built: 130 days.   

    It must be taken into account that these deadlines are automatically interrupted if difficulties arise, such as lack of permits, installation anomalies, work licences, etc., until these become available.

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Contracting: We help you sign up for your low-voltage supply

  1. Contracting: What documents are needed to sign up for a low-voltage electricity supply?

    According to current legislation, the following documents are required in order to sign up for an electricity supply for a home:

    • First occupancy permit or opening licence for the first contract.
    • Certificate of occupancy issued by the provincial body of the Ministry of Public Works or Regional Government, or final rating certificate.
    • Low-voltage Electrical Installation Certificate, depending on the type of supply, in triplicate, issued by the electrical contractor who carried out the installation and stamped by the competent authority.
    • National ID card, tax ID, company tax ID, passport or work certificate.
    • Title deed or rental agreement, or award document for public property developments.
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  2. Contracting: How much power needs to be contracted?

    The contract power rating is  the consumer’s choice, but it must fulfil standard current ratings for the controllers.

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  3. Contracting: What standardised electric power ratings are available?

    Customers can choose the contract power rating, but it must fulfil standard current ratings for the controllers. The following are the possible contracted power ratings in single-phase and three-phase installations, depending on the mains isolator (MI) current.

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  4.  

    STANDARDISED ELECTRIC POWER RATINGS (KW)
    CURRENT (A)SINGLE-PHASETHREE-PHASE
     220 V
    230 V
    3*220/380V
    3*230/400V
    1,50,330
    0,345
    0,987
    1,030
    30,660
    0,690
    1,975
    2,078
    3,50,770
    0,805
    2,304
    2,425
    51,100
    1,150
    3,291
    3,464
    7,51,650
    1,725
    4,936
    5,196
    102,200
    2,300
    6,582
    6,928
    153,300
    3,450
    9,873
    10,392
    204,400
    4,600
    13,164
    13,856
    255,500
    5,750
    16,454
    17,321
    306,600
    6,900
    19,745
    20,785
    357,700
    8,050
    23,036
    24,249
    408,800
    9,200
    26,327
    27,713
    459,900
    10,350
    29,618
    31,177
    5011,000
    11,500
    32,909
    34,641
    6313,860
    14,490
    41,465
    43,648

     

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Rates: Low-voltage electricity ratesHow are the rates broken down?

  1. Rates: How are the rates broken down?

    Electricity rates in Spain are binomial and include a Power Charge, which will depend on the power that the customer has signed up for and requested, and an Energy Charge, proportional to the energy used and calculated by the meter.

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  2. Rates: What are the most common low-voltage rates?

    You can find out about all our electricity offers.

    There is also a Small Consumer Voluntary Pricing (Spanish acronym "PVPC" for Precio Voluntario para el Pequeño Consumidor) as the resulting rate from the calculation method set by the government applicable to low-voltage electricity consumers whose subscribed power does not exceed 10 kW and who opt not to sign up for a commercial offer, since consumers may freely choose their retailers. 

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  3. Rates: What are the low-voltage access rates?

    2.0A for contracted power up to 10 kW

    2.1A for contracted power greater than 10 kW and less than 15 kW

    3.0A for contracted power greater than 15 kW

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  4. Rates: Time-of-day (TOD) rates

    Rates that apply an supplement that makes a distinction between two rate periods a day.

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  5. Rates: What is the time-of-day rate?

    It is a type of low-voltage rate that combined with the right metering equipment enables the consumer to obtain a discount on the price per kWh consumed exclusively during valley hours at night. There are two prices, one for daytime consumption and the other for night-time electricity usage.There is a further super-valley time-of-day mode that establishes three rates according to the moment of the day in which electricity is used and thus differentiating among peak, valley and super-valley periods.

    In any case, the power to be contracted for these supplies will be the maximum power expected to be demanded, taking into account both peak and valley hours.

    The duration of each period is detailed below:

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  6. DURATION OF PERIODS
    PERIODS
    DURATION OF TIME-OF-DAY RATE PERIODS
     WinterSummer
    PEAK 10 HOURS/DAYfrom 12 to  22 hoursfrom 13 to  23 hours
    VALLEY 14 HOURS/DAYfrom 0 to 12 and from 22 to 24 hoursfrom 0 to 13 and from 23 to 24 hours
     
    DURATION OF SUPERVALLEY RATE PERIODS
    PEAK 10 HOURS/DAYfrom 13 to 23 hours
    VALLEY 8 HOURS/DAYfrom 07 to 13 and from 23 to 01 hours
    SUPERVALLEY 6 HOURS/DAYfrom 01 to 07 hours

    Changes from winter to summer time and vice versa will be the daylight saving time and standard time.

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Metering equipment: Low-voltage electricity supply metering equipment

Metering equipment: Who pays for the meter testing cost?

The customers and supplier companies are entitled to request at any time that the corresponding body test the installed metering and control equipment, irrespective of their ownership.

Verification costs and any amount owed are determined by the competent body.

If verification is requested by the customer and the metering and control equipment is found to operate properly, testing costs are borne by the customer. In all other cases they are borne by the company.

Metering equipment: Is the Mains Isolator (MI) a metering or a protective device?

The Mains Isolator is a metering and control device, not a protective device.

Billing: How are low-voltage electricity supplies billed?

Billing: If a meter reading could not be taken, can the reading be given to the electricity company?

Yes, by giving the contract reference information and the meter reading. This self-reading can be submitted on our My Customer Area. If you have not registered yet, we invite you to find out about all the advantages.

Billing: What is a power charge?

It is the fixed amount paid in each billing period (every two months or every month), depending on the contracted power, in exchange for being able to use this power whenever you want. For supplies with a demand meter, the power charge will depend on the contracted power and the maximum power demanded in the billing period (monthly) and recorded by the demand meter.

Billing: What is an energy charge?

It is the amount paid depending on the energy usage. If there is no reading for the billing period, this amount will be billed as an "ESTIMATE", based on the usage records for the supply.

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