Hannover and the surrounding region are an important assessment location for us. enercity Netz is among the most digitalised grid operators in Germany — this is reflected in efficient registration processes that we rate positively in our assessments. From the Expo grounds at Kronsberg to the commercial areas in Laatzen: every one of our assessments in the region takes the specific TAB requirements of enercity Netz into account.
enercity Netz operates the grid in Hannover and surrounding municipalities. Registration is fully digitalised. Innovative solar neighbourhoods have emerged in the Expo post-use areas (Kronsberg).
In Lower Saxony, section 32a of the Lower Saxony Building Code (NBauO) governs the solar obligation. It has applied to new commercial buildings since 2023 and, since 1 January 2025, to all new buildings with at least 50 m² of roof area and to roof renewals. At least 50 percent of the roof area must be covered with PV modules. Technical obstacles or lack of economic viability usually only reduce the obligation: if only part of the roof is suitable, that part must be covered (Klimaschutz- und Energieagentur Niedersachsen).
enercity Netz accepts registration documents from installers by e-mail and assesses the cumulative capacity at the grid connection point. If existing and planned generation units and storage reach 30 kW in total, a grid compatibility assessment follows. For storage, data sheet E.3 stating the continuous output power is required, and from 25 kWp the remote control set-up under section 9 EEG (enercity Netz). Retrofitting a battery can therefore push a site over the 30 kW threshold although the PV capacity stays the same. In extension assessments we check this in advance.
For private owners in Hannover, Laatzen, Langenhagen, Seelze, Hemmingen and Ronnenberg, proKlima, the enercity fund, pays EUR 100 per kWp under its DachVollToll programme, capped at EUR 2,000. The condition is that all suitable roof areas are covered and yield at least 650 kWh/kWp per year (proKlima, 2026 guidelines).
| Regulation | Subject | Applies to |
|---|---|---|
| VDE-AR-N 4100 | Low-voltage connection | Meter location, service entrance, protection concept |
| VDE-AR-N 4105 | Generation on the LV grid | Mandatory for connection to the low-voltage grid |
| VDE-AR-N 4110 | Medium-voltage connection | Mandatory for connection to the medium-voltage grid |
| Supplementary TAB enercity Netz | Regional requirements | Grid area |
| DIN VDE 0100-600 | Initial verification | Every system before commissioning |
| Requirement | Specification |
|---|---|
| Meter type | eHZ in three-point mounting system |
| Surge protection | Type 1+2 combined arrester (mandatory for new installations) |
| SLS switch | Selective line protection switch upstream of the meter |
| Space reserve | Min. 1 slot for smart meter gateway |
| Equipotential bonding | Connection to main earthing busbar |
Balcony power plants up to 800 W can be registered via the digital online registration process. The proKlima DachVollToll programme covers rooftop systems, not balcony power plants.
Hannover is located in the TenneT control area. The responsible transmission system operator (TSO) is TenneT TSO GmbH, in charge of system stability and renewable feed-in in the extra-high voltage grid (220/380 kV). At regional distribution level, Avacon Netz is also active.
| Level | Operator | Voltage Level | Relevance for PV/BESS |
|---|---|---|---|
| Transmission grid | TenneT | 220-380 kV | System stability, EEG feed-in |
| Distribution grid | enercity Netz | 0.4-20 kV | TAB, grid connection, meter location |
| Customer installation | System operator | 0.4 kV (LV) | PV generator, BESS, inverter |
Regional points we check when planning and assessing projects in Hannover:
The former Expo grounds and trade fair halls offer over 300,000 m² of roof space. The combination of commercial use and dedicated transformer stations enables large-scale systems with medium voltage connections.
Hannover as a centre of science drives innovative PV-BESS projects. Research collaborations require assessments that go beyond standard TAB — particularly for grid balancing services and virtual power plants.
Hannover is supplied by enercity Netz and Avacon Netz. On the city outskirts (Laatzen, Langenhagen), responsibilities change — the TAB requirements differ in detail.
Hannover plans a geothermal district heating network by 2035. PV-BESS systems are being integrated into neighbourhood energy concepts as a supplement — here, combined assessments covering both electricity and heat are in demand.
| Occasion | Our Service |
|---|---|
| Acceptance | TAB conformity, defect protocol |
| Dispute with grid operator | Independent technical evaluation |
| From 30 kWp or medium voltage | Support, grid compatibility assessment |
| Defects | DIN VDE 0100-600, thermography, EL |
| Grid bottleneck | Grid analysis, alternative concepts |
VDE-AR-N 4100 and 4105 (low voltage) or 4110 (medium voltage) plus supplementary TAB of enercity Netz GmbH.
Exclusively through a certified electrical contractor. Details: enercity Netz website.
Must comply with VDE-AR-N 4100 and supplementary TAB. Older cabinets (pre-2010): eHZ, surge protection, SLS. Cost: EUR 1,000-2,500.
Depends on system size and scope. Contact: info@pv-bess-assessor.com or +49 89 97 31 37 43.
For systems from 30 kWp, medium voltage connections, grid compatibility issues, disputes with the grid operator, acceptance of commercial systems.
We know the TAB of enercity Netz from daily practice. Get in touch with us.
Contact Us| Address | enercity Netz GmbH, Auf der Papenburg 18, 30459 Hannover |
| Phone | 0511 430-0 |
| info@enercity-netz.de | |
| Website | enercity Netz — TAB |
We prepare PV and BESS assessments throughout Germany. The following pages summarise the technical connection requirements of the respective grid operator:
Augsburg Berlin Bielefeld Bonn Bremen Dortmund Dresden Düsseldorf Duisburg Frankfurt Hamburg Karlsruhe Köln Leipzig Mannheim München Münster Nürnberg Stuttgart
Last updated: 2026-11-03 | Source: enercity Netz GmbH