As assessors, we prepare reports in Bonn and the Rhein-Sieg district for system operators, investors, and courts. The historic building stock in Bad Godesberg and Bonn's Suedstadt requires particular care with PV projects — this is precisely where knowledge of Bonn-Netz's TAB proves crucial for a standards-compliant installation. In disputes over grid connection requirements, we mediate as a neutral authority.
Bonn-Netz supplies the federal city of Bonn with approximately 330,000 inhabitants. In the former government quarter and the Gruenderzeit districts, many existing buildings are equipped with older meter cabinets that need to be modernized when installing PV.
The city funds solar systems through the “Solares Bonn” programme. Under the guideline in force since August 2025, residential buildings with up to three units receive EUR 100 per kWp if the suitable roof area is fully covered. For apartment buildings with four or more units, facade systems and listed buildings, up to EUR 300 per kWp is possible. In October 2025 the funds were exhausted. According to Haus & Grund Bonn/Rhein-Sieg, EUR 800,000 has been available again since 1 January 2026. The application must be filed before the installer is commissioned.
For listed buildings, decision guidelines issued by the North Rhine-Westphalia building ministry have applied since 8 November 2022. Solar systems not visible from public space are generally to be permitted. Visible systems can be approved if they are reversible, preserve the historic fabric and blend in visually, for example matt modules without frames or with frames of the same colour. The City of Bonn has published its own guidelines for listed buildings and heritage areas.
For listed properties in Bonn, our assessment compares the installed system with the heritage permit and the funding conditions. If the execution deviates, both the permit and the grant may be called into question.
| Standard | Scope | Relevance for PV |
|---|---|---|
| VDE-AR-N 4100 | TAR low voltage | Mandatory: meter location, service entrance, protection concept |
| VDE-AR-N 4105 | Generation systems on LV grid | Mandatory for connection to the low-voltage grid |
| VDE-AR-N 4110 | TAR medium voltage | Mandatory for connection to the medium-voltage grid |
| Supplementary TAB Bonn-Netz | Regional supplements | Grid operator-specific requirements |
| Requirement | Specification |
|---|---|
| Meter type | eHZ, three-point mounting |
| Surge protection | Type 1+2 combined arrester (mandatory for new systems) |
| SLS switch | selective circuit breaker upstream of the meter |
| Space reserve | 1 slot for smart meter gateway |
| Equipotential bonding | to main earthing busbar |
Plug-in generation systems up to 800 W can be registered with Bonn-Netz through a simplified process.
Bonn is located in the Amprion control area. The responsible transmission system operator (TSO) is Amprion GmbH. Amprion is responsible for system stability in the extra-high voltage grid (220/380 kV).
| Level | Operator | Voltage Level | Relevance for PV/BESS |
|---|---|---|---|
| Transmission grid | Amprion | 220-380 kV | System stability, EEG feed-in |
| Distribution grid | Bonn-Netz | 0.4-20 kV | TAB, grid connection, meter location |
| Customer system | System operator | 0.4 kV (LV) | PV array, BESS, inverter |
Regional factors for planning and assessment in Bonn:
Bonn's Federal Quarter with former government buildings is increasingly being developed with solar. The buildings of the Federal Republic are subject to special security requirements — PV assessments must meet extended requirements here.
Bonn's eastern districts (Bad Godesberg, Mehlem) are situated at the Siebengebirge hills. Slope angle and shading from forest stands require precise yield calculations with terrain models.
Bonn is partially located in the Rhine flood zone. BESS in Beuel and the Rheinaue require installation above the HQ200 level and watertight enclosures for power electronics.
The Bonn corporate headquarters (Telekom, Post/DHL) are driving large rooftop PV projects. Systems above 1 MWp require dedicated protection concepts and coordination with Bonn-Netz.
| Occasion | Our Service |
|---|---|
| Acceptance assessment | TAB conformity check, defect report |
| Dispute with grid operator | Independent technical evaluation |
| Systems from 30 kWp, medium voltage, capacity bottleneck | Grid compatibility assessment, grid analysis, alternative concepts |
| Defect assessment | DIN VDE 0100-600, thermography, EL |
VDE-AR-N 4100 and 4105 (low voltage) or 4110 (medium voltage) plus supplementary TAB of Bonn-Netz GmbH.
Exclusively through a certified electrical contractor. Details: Bonn-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, grid compatibility issues, disputes with the grid operator, acceptance of commercial systems.
We know the TAB of Bonn-Netz from daily practice. Get in touch.
Contact Us| Address | Bonn-Netz GmbH, Sandkaule 2, 53111 Bonn |
| Phone | 0228 711-0 |
| netzanschluss@bonn-netz.de | |
| Website | Bonn-Netz — TAB |
We assess nationwide. These pages summarise the TAB of each grid operator:
Augsburg Berlin Bielefeld Bremen Dortmund Dresden Düsseldorf Duisburg Frankfurt Hamburg Hannover Karlsruhe Köln Leipzig Mannheim München Münster Nürnberg Stuttgart
Last updated: 2026-11-03 | Source: Bonn-Netz GmbH