Ensure the connectivity of the micro-generation system to the electricity network
If you are considering your own micro-generation system, such as solar panels, please let us know before you buy it. This way, you can avoid unpleasant surprises during the commissioning phase if it is not possible to connect the equipment to the network.
Power limits for low-voltage connections for micro-generation
As a distribution company, we must ensure that the quality of electricity meets the standard requirements in all network operating situations. In addition, the network must be safe to use at all times.
In the table below, we show the maximum allowed rated nominal output of generation and electricity storage for different sizes of low-voltage connections. These power limits are based on our sizing principles. If you follow the table, you do not need to do a separate check of the connectivity of the generation system.
Please note: If electricity storage is connected to a low-voltage connection in addition to generation, the connectivity is defined separately for the generation equipment and the electricity storage.
The limit values in the table apply to micro-generation/electricity storage in which an inverter acts as the connection device. For medium-voltage connection generation equipment/electricity storage, a case-by-case review of connectivity is always carried out, regardless of the size of the generation installation.
| Connection size | Production connectivity | Electricity storage connectivity |
| 3×25 | 11.0 kW | 5.5 kW |
| 3×35 | 11.0 kW | 5.5 kW |
| 3×50 | 11.0 kW | 5.5 kW |
| 3×63 | 14.1 kW | 7.0 kW |
| 3×80 | 18.7 kW | 9.4 kW |
| 3×100 | 25.5 kW | 12.8 kW |
| 3×125 | 31.5 kW | 15.7 kW |
| 3×160 | 41.8 kW | 20.9 kW |
| 3×200 | 55.0 kW | 27.5 kW |
| 3×250 | 72.6 kW | 36.3 kW |
| 3×315 | 96.8 kW | 48.4 kW |
The maximum power of a 1-phase micro-generation installation shall not exceed 3.7 kW, and the maximum power of 1-phase electricity storage shall not exceed 1.85 kW. In addition, the distribution company must be informed of the phase to which the equipment is connected.
For connections larger than 3×315 A, the “Pn” of the connection is the product of the number of parallel main fuses and the corresponding Pn value in the table above.
Example: Connection 3×500 A → 2 x (3x250A) → 2 x 72.6 kW = 145.2 kW
If the power of the generation equipment exceeds these limits, the connectivity must ALWAYS be checked.
The power limits have been determined on the basis of Finnish Energy’s recommendation YA 9:23 (Connection of micro-generation and electricity storages to the electricity distribution network) dated 12 June 2025.
Network dimensioning is based on the network recommendation SA 4:22 (Kaapeloitujen pj-liittymisjohtojen mitoitus ja suojaus (Dimensioning and protection of cabled low-voltage branch pipes)).
Check the connectivity of the equipment
Technical requirements for equipment and
connection
Recommendation of Finnish Energy: Pientuotannon ja sähkövarastojen liittäminen sähkönjakeluverkkoon (Connection of micro-generation and electricity storages to the electricity distribution network)
Fingrid: System requirements for power plants
Before purchasing equipment, please check with the equipment supplier that it complies with the standards and requirements mentioned on this page.
Please note: VDE-AR-N 4105: Equipment complying with the 2018-11 requirements document will no longer be approved for installation in the Finnish distribution network after 31 December 2022. From 1 January 2023, all equipment must meet the requirements of the European standard for small-scale production SFS-EN 50549-1:2019.
See more detailed terms and conditions
Any questions?
We have collected answers to frequently asked questions about personal electricity generation and how to get started.