This map shows indicative values of available consumption connection capacity on the busbars of substations with voltages above 1kV operated by i-DE.
These capacities are shown in compliance with RD 1183/2020 of December 29, on access and connection to the electricity transmission and distribution networks, and Circular 1/2024, of September 27, of the CNMC, which establishes the methodology and conditions for access and connection to the transmission and distribution networks of electricity demand facilities.
The calculation and publication of demand capacities are carried out based on the provisions of the Resolution of June 8, 2025, of the CNMC, which establishes the detailed specifications for determining the firm access capacity of demand to the electricity distribution networks (“The Resolution of June 8”),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 electricity generation facilities by distribution network managers.
In accordance with the above, in the study scenario, distribution facilities commissioned in the current year, included in the investment plan approved by the General State Administration, have been taken into consideration, not including future reinforcements.
In the capacity assessment, the technical criteria for the safety and quality of the electricity supply established in current regulations have been applied, both under conditions of total network availability as well as in conditions of failure of a network element.
Without prejudice to the fact that the published capacity map has applied the criteria established in the Resolution of June 8, 2025, it must be taken into account that once the particular analysis of the network is carried out for the issuance of the Technical-Economic Conditions Report, Depending on the territory, the provisions of the corresponding regional legislation will apply, which could result in the application being denied due to lack of access capacity.
The published access capacities should be considered informative, without avoiding the need to carry out a specific study.for each specific application, which will take into account any variation in the study scenario that may arise 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, generation, storage or commissioning scenarios of new distribution facilities.
It should also be taken into consideration that, due to the influence that nodes have on each other in the distribution network, the total available capacity of a zone (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 be assessed by a simple sum of the published capacities at the different voltage levels of said substation.
Except in exceptional cases, duly justified, applications for access and connection for a single supply or grouping that do not comply with the range of maximum and minimum powers by voltage level established in section 3.2 of the Resolution of June 8, 2025, of the CNMC, which establishes the detailed specifications for determining the firm access capacity of demand to the electricity 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) | Maximum access capacity to be requested on MV line main(MW) |
|---|
| 132-110 | 10 | 12 | 100 | -2 |
| 66 | 6 | 10 | 60 | -2 |
| 55-50 | 5 | 10 | 50 | -2 |
| 45 | 4 | 7 | 40 | -2 |
| 30 | 4 | 2 | 30 | 12 |
| 24-25 | 4 | -2 | 20 | 5 |
| 20 | 4 | -2 | 15 | 5 |
| 1 < U ≤ 15 KV | 4 | -2 | 10 | 4 |
All consumer applications correctly submitted in accordance with current regulations will be admitted for processing and i-DE will carry out a specific study applying the capacity assessment criteria set out in the aforementioned regulations. In particular, in the specific study of each application, reasonableness criteria will be applied when the application is affected at voltage levels higher than in an N-1 scenario.
The specific study of each application may result in (i) the issuance of a favorable prior proposal, in which the following will be determined: the technical solution and node of the connection point to the distribution network (i-DE being able, where applicable, to propose reinforcements to increase said capacity at the applicant's expense), or (ii) in the denial of the request made, based on the capacity analysis, all in accordance with current regulations.
The nodes marked with «0* MW» are those that do not have capacity in the scenario used for the publication of the map but that could obtain it conditioned on the execution of reinforcements in the distribution network at the same voltage level and provided that the feasibility of its execution is compatible with the validity of the access and connection permits. Applications made with an impact on these nodes will be informed with the appropriate reinforcements, or denied based on the capacity analysis carried out by i-DE in accordance with current regulations.
Applications made with an impact on 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 impact on the transmission network. All this, even if the node has received a volume of applications greater than the indicative capacity previously calculated as available for distribution.
The values considered in the capacity map refer exclusively to the capacity in the distribution network and are subject to the analysis of access requests from the perspective of the transmission network in cases where this is the case. is required.
With regard to the information published in the column "Firm access capacity of occupied demand (MW)", the values of the powers granted in the firm access and connection permits and in applications with a favorable study have been considered without the application of the simultaneity coefficients included in the current Detailed Specifications of Firm Distribution Demand.
The node of the transmission network indicated in the capacity map is the one with the majority allocation at the time of calculating and publishing this information. This allocation is subject to possible variations depending on the modifications that may occur in both the distribution network and the transport network, either due to the commissioning of new network facilities, the incorporation of reinforcements in the existing network or due to changes in operation.
The information contained in the capacity map will be updated with a minimum monthly frequency, as indicated in the current regulations.
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