Connection fee (Anschlussbeitrag)

A connection fee is a financial contribution to the establishment or expansion of an infrastructure connection or to the infrastructure provided for it. In the electricity sector, the term is often used as a collective label. However, it does not automatically denote a specific payment regulated identically everywhere. For a reliable offer, it must therefore be clear whether it refers to specific costs of the grid connection, a construction cost contribution or other services. The following legal explanations relate to Germany.

Which costs are meant?

Grid connection costs concern the individual link between the customer installation and the public grid. A construction cost contribution, by contrast, makes the connection user share in the cost of upstream shared grid infrastructure. In addition, expenses may arise within the building or the company premises. These do not belong to the grid operator's price merely because they are necessary for commissioning. An offer should keep these cost blocks and their respective responsibility boundaries separate.

Technically, a connection is more than a cable. Depending on the project, it may involve civil engineering works, cables, a house connection box, a meter position, a transformer, switchgear, protection technology and metering and communication equipment. Not every project needs all components. Nor is every component automatically a connection facility: a transformer, for example, may serve a single customer installation or form part of the general grid. For cost allocation, the function within the specific connection concept is therefore decisive, not the designation of the equipment alone.

The connection payment must conceptually be distinguished from ongoing grid charges. It concerns the establishment or provision of a connection option, not the continuing supply of electricity. For project calculations, one-off connection expenses and recurring operating, metering and energy costs should therefore form separate items. An agreed instalment payment would not remove this substantive distinction.

Germany: low-voltage consumption connections

Within the scope of the Low-Voltage Connection Ordinance (Niederspannungsanschlussverordnung), the necessary costs of establishing or modifying a connection upon request may be charged under § 9 NAV, including by means of permissible flat rates. The construction cost contribution is governed separately by § 11 NAV: it may only cover the part of the required capacity above 30 kW. In total, construction cost contributions may cover at most 50 percent of the necessary distribution system costs specified there. This is not a halving of all connection costs. Connection costs and contribution must be shown separately; a significant increase in capacity can justify a further contribution.

A simplified example: with a required capacity of 50 kW, 20 kW lie above the threshold. This does not yet yield a euro amount; the grid operator's permissible calculation basis is missing for that. At 25 kW, the construction cost contribution does not apply in the case described, but the invoice for establishing the connection does not necessarily fall away. The statement “up to 30 kW the connection is free of charge” would therefore be wrong.

Larger consumption connections

The low-voltage rules cannot be transferred across the board to medium- or high-voltage connections. The Federal Network Agency (Bundesnetzagentur) describes construction cost contributions above low voltage as one-off, capacity-dependent contributions for upstream grids in the case of load-side consumption. They are thus not a billing of the kilowatt-hours consumed annually. For large consumers, the offer must in particular make the voltage level, capacity scope, connection facilities and calculation method identifiable.

Why connection capacity matters is shown by a thought experiment: one business draws 1 MW for 100 hours, another 100 kW for 1,000 hours. Each draws 100 MWh. Nevertheless, the first requires a maximum capacity ten times higher. The same annual energy quantity therefore does not imply the same need for connection capacity. The example is not a contribution formula but illustrates the difference between capacity in kW or MW and energy in kWh or MWh.

Accordingly, a connection fee is also not necessarily an invoice for exactly the construction measure that a single project visibly triggers. An additional cable may later serve several users; conversely, an existing item of equipment may already offer considerable capacity reserves. The technical question “What has to be built?” and the legal question “Who pays which share?” must be answered separately.

Renewable generation installations: different cost allocation

For generation installations within the scope of the EEG, a different allocation applies in principle: under § 16, the installation operator bears the necessary connection costs to the relevant point of interconnection, including necessary metering equipment. Under § 17, the grid operator, by contrast, bears the costs of optimisation, reinforcement and expansion of its grid. If it assigns a different point of interconnection under § 8(3), it bears the additional costs arising as a result. The statutory delimitation must not be obscured by a non-specific lump-sum item “connection fee”.

A photovoltaic or wind power installation may thus require expensive connection lines without being allocated all the grid expansion costs it triggers. Conversely, the grid operator's bearing of the costs of expansion does not mean that the entire connection of the generation installation would be free of charge. Anyone comparing offers must therefore examine in particular the point of interconnection and the boundary between the connection and the general grid.

Battery storage and flexible connections

For grid-connected battery storage, electricity consumption and feed-in must be considered separately. On 15 July 2025, in case EnVR 1/24, the Federal Court of Justice (Bundesgerichtshof) upheld a construction cost contribution for a battery storage system calculated under the capacity price model. Subsequent feed-back does not in itself justify a discount on the consumption side. According to the Federal Network Agency's explanations, however, contractually agreed restrictions on grid consumption may influence an appropriate reduction. This is an individual case to be assessed on a non-discriminatory basis, not a general storage bonus.

For planning, this means: the mere intention to operate an installation flexibly must be distinguished from a binding capacity restriction. Anyone weighing lower connection expenses against restricted availability should also consider possible revenue losses or production restrictions. A cheaper connection is not automatically the cheaper overall solution economically.

Location signal and limits

Connection payments can create incentives to request only the capacity actually needed and to examine locations with suitable grid capacity. The Federal Network Agency permits objectively justified, transparently presented location differentiation for transmission system operators. However, this does not give rise to a general rule under which a weak rural grid always demands a higher construction cost contribution than an urban grid. Specific connection costs and flat-rate contributions may react differently to location.

A low contribution likewise proves neither low overall technical costs nor a particularly fast connection. Equally, a high amount in itself proves neither inefficient bureaucracy nor an unjustified demand. For assessment, technical necessity, permissible cost allocation and time requirements must be kept apart. Especially in electrification projects, a price-attractive offer can be of little help if the required grid expansion is not completed by the planned start of operation.

What a verifiable offer should answer

Which legal basis, installation class and voltage level apply, and what capacity is bindingly provided for consumption and feed-in respectively?
Which items concern connection facilities, construction cost contribution, customer-owned technology and other project services? Are amounts, value added tax and possible subsequent charges clearly stated?
Which technical limits, execution dates and payment prerequisites have been agreed? What changes in the event of higher capacity, a different operating concept or later expansion stages?

Used precisely, “connection fee” thus does not describe a uniform access charge but a cost contribution to be explained on the basis of the specific set of rules. Only the breakdown shows which infrastructure is being paid for and which financial obligations actually arise.

Sources

Niederspannungsanschlussverordnung – NAV — Bundesministerium der Justiz und für Verbraucherschutz; Bundesamt für Justiz; 2025-12-18. § 9 Abs. 1 und 3; § 11 Abs. 1–5; konsolidierte Fassung, zuletzt geändert am 18. Dezember 2025
Erneuerbare-Energien-Gesetz – EEG 2023 — Bundesministerium der Justiz und für Verbraucherschutz; Bundesamt für Justiz; 2025-12-18. § 8 Abs. 1–6; § 12; §§ 16 und 17; konsolidierte Fassung, zuletzt geändert am 18. Dezember 2025
Baukostenzuschüsse: Positionspapier zur Erhebung von Baukostenzuschüssen — Bundesnetzagentur, Beschlusskammer 8; 2024-11-20. Erläuterungen unter „Positionspapier zur Erhebung von Baukostenzuschüssen“, Stand 20. November 2024
Stromspeicher — Bundesnetzagentur; unbekannt. Abschnitt „Baukostenzuschüsse“: Erhebung bei Batteriespeichern, Ermäßigungen und flexible Netzanschlussvereinbarungen
Netzanschluss — Bundesnetzagentur; unbekannt. Abschnitte „Welche Kosten entstehen für den Netzanschluss?“ und „Welche Angaben muss der Netzanschlussvertrag enthalten?“

Related glossary entries

Edited by eCMS on 11.11.2026 13:58