I-DE
GRID CONNECTION
ENERGY PRODUCERS
CAPACITY MAP

Map of Electricity Generation Capacity

This map shows the maximum available generation connection capacity at nodes with a voltage higher than 1 kV in the i-DE distribution network.

MAPA INFORMATIVO DE CAPACIDAD

If you need it, click here to access the instructions for use, interpretation, and other relevant considerations.

IMPORTANT NOTICE GENERATION MAP

This map shows indicative values of the generation connection capacity available at the busbars of substations with a voltage greater than 1kV operated by i-DE.

These capacities are shown in compliance with RD 1183/2020 of December 29, on access and connection to the transmission and distribution networks of electrical energy and Circular 1/2021, of January 20, of the National Commission of Markets and Competition, which establishes the methodology and conditions for access and connection to the transmission and distribution networks of electrical energy production facilities.

The calculation and publication of the Demand capacities are carried out based on the provisions of the Resolution of June 27, 2024, of the National Commission of Markets and Competition, which establishes the detailed specifications for determining the generation access capacity to the transmission grid and distribution networks (“The Resolution of June 27”), in accordance with the format regulated in the resolution of April 30, 2025, of the National Commission of Markets and Competition, which establishes the formats for the publication of access capacities for demand and electric power generation facilities by distribution grid operators.

In accordance with previous, in the study scenario, the distribution facilities that came into service in the current year, included in the investment plan approved by the General State Administration, the generation with access and connection permits granted, but not yet connected and the access requests in process (not including the reported reinforcements) have been taken into consideration.

In the evaluation of the capacity, the technical criteria of security and quality of the electricity supply established in the current regulations have been applied, both in conditions of total availability of the network and in conditions of failure of a network element.

The published access capacities must be considered as informative, without avoiding the need to carry out a specific study for each specific request, in which the into account any variation in the study scenario that arises after its publication, both at the node under study and at other nodes in the network that may have an influence on it due to changes in the facilities considered, such as possible variations in the demand and generation scenarios or the commissioning of new distribution facilities.

It should also be considered that, due to the influence that nodes have on each other in the distribution network, the total available capacity of an area (set of nodes) should not be considered as the sum of the capacities of the nodes that comprise it. In particular, the available capacity at a substation should not calculated by a simple sum of the published capacities at the different voltage levels of said substation.

Except in exceptional cases, duly justified, access and connection applications that do not comply with the range of maximum and minimum powers by voltage level established in the Resolution of May 20, 2021, of the National Commission of Markets and Competition, which establishes the detailed specifications for determining the generation access capacity to the transmission grid and the distribution networks, which is detailed below, will not be admitted:

Name
Voltage level (kV)	Minimum requested access capacity for connection via new position in existing substation (MW)	Minimum requested access capacity by opening existing line (MW)	Maximum access capacity for connection via position in substation (MW)
132-110	10	12	100
66	6	10	60
55-60	5	10	50
45	4	7	40
30	4	2	30
24-25	4	-	20
20	4	-	15
> 1 ≤ 15	4	-	10
BT	-	-	0.1

Applications made for nodes where the published capacity is "0 MW" will be rejected, and the provisions of Article 8.1 section d) of Royal Decree 1183/2020, of December 29, on access and connection to the electricity transmission and distribution networks will apply (loss of 20% of the guarantees deposited).

Nodes marked with "0* MW" are those that do not have capacity at the time of publication of the map but could obtain it subject to the execution of reinforcements in the distribution network by the applicant or denied based on the capacity analysis carried out by i-DE in accordance with the regulations. current. In this case, the aforementioned Article 8.1 section d) of Royal Decree 1183/2020, of December 29, will not apply.

Applications made for nodes where capacity is compromised due to regulatory issues will be admitted because other applications with better priority are pending resolution by tender at their node of majority affectation in the transmission network. All this, considering that the node has received a volume of applications greater than the indicative capacity previously calculated as available for distribution.

In the rest of the access and connection requests, if the access capacity of the network at the time of making said requests is lower than the requested capacity, i-DE may propose, at the applicant's expense and in accordance with current regulations, reinforcements to increase said capacity.

The contemplated values The information provided in the capacity map refers exclusively to the capacity of the distribution network and is subject to analysis of access requests from the perspective of the transmission network in cases where this is required, in accordance with current regulations.

The transmission network node indicated on the capacity map is the one with the greatest impact at the time of calculating and publishing this information. This impact is subject to possible variations depending on any changes that may occur in both the distribution network and the transmission network, whether due to the commissioning of new network facilities, the incorporation of reinforcements in the existing network or changes in operation.

The information contained in the capacity map will be updated at least monthly, in accordance with It is indicated in the current regulations.

Information on the process of access and connection of producers can be consulted on the website: https://www.i-de.es/conexion-red-electrica/autoconsumo-electrico-produccion-energia/productores-energia

INSTRUCTIONS FOR USE, INTERPRETATION AND OTHER RELEVANT CONSIDERATIONS GENERATION MAP

Use of the application:

Zoom

Use the +/- controls to zoom in or out, if you have a mouse with a wheel, you can scroll the wheel.
Detail information is displayed at the substation level, so zoom in to that level and click with the mouse on the circles, which appear inside the graphical representation of the substation, to get the information.

Legend/Layers

Allows you to activate or deactivate layers to display information by voltage level.
The numerical value below the circles at the CCAA and province level represents the number of nodes with available capacity for the layer considered.

Interpretation:

The format and meaning of the published fields are in accordance with the provisions of the resolution of April 30, 2025, of the National Commission of Markets and Competition, which establishes the formats for the publication of access capacities for demand and electricity generation facilities by distribution network operators.

Knots with Knot field 0* = «1»

Node without capacity at the time of calculating the capacity map, but which could have capacity as described in the corresponding methodological note, marking the rest of the cases as «0».
The access and connection solution, the specification of the necessary reinforcements and the connection conditions will be determined for each access and connection request at this specific node.

Nodes with field Capacity compromised due to regulatory issues = «1»

The hub has received applications whose resolution is pending because its hub, which is most affected by the transportation network, is currently in competition.

Relevant considerations:

Name
Voltage level (kV)	Minimum requested access capacity for connection via new position in existing substation (MW)	Minimum requested access capacity by opening existing line (MW)	Maximum access capacity for connection via position in substation (MW)
132-110	10	12	100
66	6	10	60
55-60	5	10	50
45	4	7	40
30	4	2	30
24-25	4	-	20
20	4	-	15
> 1 ≤ 15	4	-	10
BT	-	-	0.1

You can also download and view the map data in the following formats: / /

Date and time of publication: 02/10/2025 at 11:36h.

Click here to access the "Methodological Note 0*"

METHODOLOGICAL NOTE 0*

Nodes with 0 capacity*

These are nodes without available access capacity at the time of publication, but they could obtain it subject to the execution of certain types of reinforcement by the applicant, provided there are no other constraints, which will be individually verified throughout the access and connection process. These requirements can both condition the feasibility of the reinforcements and require additional adaptation or refurbishment work on installations.

The general types of reinforcement considered for the calculations to indicate nodes with 0* capacity are as follows:

Transformer reinforcement:

The replacement of the existing transformer(s) that supply the voltage level where the 0* is located with new transformers of the maximum standardized power for the corresponding voltage level; or
The implementation of one or more additional transformers in existing installations to supply the voltage level where the 0* is located.

Line reinforcement, which includes:

The repowering of existing lines according to standardized conductor types or their reconstruction as multiple circuit lines; or
The construction of new lines in cases where, due to their length, layout, topography, etc., their execution is considered viable.

Cases where there is a dependency on the Transmission Network Manager that may condition the feasibility of reinforcements in the distribution network (existing or planned Transmission Network positions within the approved Transmission Network plan) must be individually verified in the access and connection process.

In all cases, the solution will always be conditioned by the execution of the proposed reinforcements.