Connection to the high-voltage and medium-voltage network
Caruna offers connections for large electricity users and producers at voltage levels of 110kV and 20kV. We plan and implement the connections in collaboration with the customer. Please contact us through Caruna’s Capacity Map Service.
Overview of high-voltage and medium-voltage network
A high voltage connection is a direct connection to Caruna's high-voltage electricity distribution network. In general, a high-voltage connection is needed when the power demand exceeds 15 MVA. In a high-voltage connection, the electricity supply is provided at a voltage of 110 kilovolts. The high-voltage connection is intended for companies that are large-scale industrial electricity users or producers, such as wind or solar farms, and large data centers, and large industrial facilities, and large energy storages.
A medium voltage connection is direct connection to Caruna's medium voltage electricity distribution network. In general, a medium voltage connection is needed when the power demand exceeds 0.7 MVA. For electricity production connections, the limit starts at 0.3 MVA. The electricity supply of a medium voltage connection takes place at a voltage of 20 kilovolts. The medium voltage connection is intended for companies that are large electricity users, such as shopping centres, and industrial facilities, and energy storage.
The power limits are indicative and can be deviated from if there are justified reasons.
Connection to the high-voltage and medium-voltage network
Find out the connectivity of Caruna’s distribution network
Caruna assess the connection possibilities based on the customer’s connection information.
You can submit an inquiry through the capacity mapping service.
Preliminary planning
After the connectivity review, Caruna continues with more detailed planning of the connection together with the customer. In the preliminary planning phase, the connection solution and technical requirements for the implementation of the connection are specified based on the basic information of the customer's equipment. The preliminary planning phase takes into account the impact of the connection on reliability of supply, electrical safety, other customers, the environment, and the overall costs of the connection solution. The connection must not compromise the usability of the existing electricity network and customer connections.
During the planning process, it is advisable to initiate the permit application process for the possible connection cable and to check for any crossings with Caruna or other network companies.
Project development and connection offer
In the connection offer, Caruna specifies the connection point, delivery time, and detailed requirements for the connection. The connection method is always agreed upon on a case-by-case basis with the customer. The technical solution and pricing of the connection are determined according to Caruna's connection principles (in Finnish).
Connection agreement
The connection and connection method are agreed upon in a connection agreement, which specifies the connected power, connection point, connection fee, connection conditions, as well as the property and control border.
For high-voltage connections, a prerequisite for the connection agreement is that the required zoning plan (or planning permission) and building permit are legally valid, and any necessary permit for the acquisition of the connection cable has been submitted to the authorities.
Construction and Commissioning
The commissioning of the connection requires a valid network service agreement.
With the fees specified in the network service price list, Caruna takes care of electricity distribution and provides network services related to electricity distribution, including network maintenance, energy measurement, and 24/7 fault response. In addition, the fees cover transmission network charges.
We adhere to the recommended contract terms by the Finnish Energy Industries Association (Energiateollisuus ry), which provide clear rules for agreements between the customer and the distribution company. We always follow the given contract terms when making connection and electricity network agreements (SJVPE & VPE) and the current network service price list.
It is advisable to notify the connection request in a timely manner, at least 3 weeks in advance.
The different stages mentioned above for the connection progress simultaneously with the verification process of Fingrid's system technical requirements.
Find out about connectivity on Caruna's capacity map
When the power demand or the power of the production facility is known, network connectivity at the desired location is first determined and preliminary implementation planning is carried out. From Caruna's capacity map, you can tentatively check whether there is space for the connection in the medium voltage network.
Preliminary planning of the electricity connection begins when Caruna has checked the connectivity of the connection. Preliminary planning defines the delivery time of the connection and the expansion costs of connecting to the electricity network.
Check the free capacity of the medium voltage network in the map service
From Caruna's map service, you can check the capacity situation of the medium voltage electricity network in your selected area. From the service, you can contact us by making a preliminary study request about a medium voltage connection.
Free network capacity
The map tentatively shows the points in Caruna's network to which consumption or production of 1–5 MVA can be connected. The result shown on the map needs to be checked with Caruna. You can make a contact request in the map service.
Contractor instructions for medium voltage connections
Contractor, looking for instructions on medium voltage connections? You can find the instructions for the planning, commissioning and protection of a medium voltage connection on our contractor page.