Short answer
What you need to know first.
For a PV system in Aargau, the responsible grid operator must assess the connection and metering concept before implementation. In AEW’s service area, the connection request is answered within three weeks; TAG, the installation notice before work, the initial test and SiNa form the technical process. Other grid areas have their own requirements.
Important
As of 19 July 2026, the three-week response and six-month TAG validity come from the AEW process and works regulations and do not apply automatically to every Aargau connection point. Building-law clearance and binding technical approval remain separate decisions; this is not individual electrical or legal advice.
Decision points
What determines the right path.
The grid operator depends on the connection point: AEW describes its process only for its own service area. Elsewhere in Aargau, the responsible distribution grid operator decides the connection conditions, metering concept and any required grid upgrade; an AEW approval is not a substitute there.
The technical sequence is binding: for a parallel-operated generation system, the German-speaking Switzerland works regulations require the TAG first and then the installation notice. A TAG expires if no installation notice follows within six months of approval.
The AEW timeframe is a planning anchor, not a construction guarantee: AEW states that it answers a connection request within three weeks. This does not replace a complete technical review or set a date for meter work or any necessary grid reinforcement.
The installation notice belongs before execution: ESTI identifies it as a pre-work notification for PV systems connected to the low-voltage distribution grid. In AEW’s service area, it must be submitted by a licensed electrical installer; a quotation alone is not sufficient.
The metering concept and additional loads determine the modification: AEW checks with the PV registration whether the requested feed-in capacity is available in the grid. Battery storage, a wallbox or heat pump must therefore appear with inverter data and the meter concept in the same technical dossier, not only after installation.
Commissioning must be completed with evidence: ESTI requires an initial test and test record before commissioning, even without a grid connection. For the Pronovo notification, complete certified system data are required after commissioning; integrated systems also need construction or completion photographs.
Sequence
How the project stays cleanly managed.
- 1
Identify the connection point and grid operatorassign the property to its actual distribution grid operator and clarify whether AEW is responsible. Only then can its three-week response time, portal process and document list be used sensibly as a scheduling basis.
- 2
Set the technical concept before orderingrecord PV capacity, inverter, feed-in capacity, battery storage, wallbox, heat pump and intended self-consumption. In AEW’s service area, the PV registration shows whether the requested feed-in capacity is available in the grid.
- 3
Submit the TAG and await assessmentfor a parallel-operated generation system, the technical connection request is submitted before the installation notice. In AEW’s service area, it goes to the responsible regional centre; according to AEW, the connection request is answered within three weeks.
- 4
File the installation notice through the electrical specialist before work begins: the works regulations require the installation notice before work; in AEW’s service area it must be filed within six months of TAG approval. Use it to align the meter location, metering concept and material scheduling.
- 5
Document installation, testing and the safety certificatebefore commissioning, the electrical specialist performs the initial test and records it in the test record. In the AEW process, the SiNa, PV measurement and test record and commissioning record are relevant documents.
- 6
Complete the grid-side implementation and commissioningdo not commission the system until the agreed grid and metering step has been completed. Keep final system data, test records and grid-operator correspondence together so that connection, acceptance and later Pronovo notification information do not conflict.
- 7
Handle Pronovo after commissioning with the same datasubmit the complete commissioning notification with certified system data. For integrated systems, Pronovo also requires construction or completion photographs; the incentive notification does not replace grid approval.
Checklist
Questions to settle before the quote.
- Identify the responsible distribution grid operator and connection point before detailed planning
- In the AEW service area, file the TAG before the installation notice and before work begins
- Include battery storage, a wallbox and heat pump in the metering concept rather than after installation
- Provide the SiNa, measurement and test record and commissioning data for the grid operator and Pronovo
FAQ
Common questions on this topic.
Sources
Official sources & references.
The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.
- AEW: installing a generation systemAEW Energie AG
- AEW digital notification systemAEW Energie AG
- German-speaking Switzerland works regulations 2025AEW Energie AG / VSE
- ESTI: notification duties and PV checksSwiss Federal Inspectorate for Heavy Current Installations ESTI
- Pronovo photovoltaic guideline 2026Pronovo AG