Microgenerator connection

In order to generate electricity for your own consumption, you have the opportunity to install a micro-generator in the existing connection and connect it for parallel operation with the electrical network. The micro-generator connection is a service used by both households and business customers (e.g. farms) that choose to generate electricity from renewable sources, thus reducing the amount of electricity received from the electrical network. To ensure that the operation of the micro-generator does not interfere with the electrical network, it is imperative to secure the approval for its installation from Sadales tīkls.

A micro-generator is a machine used for generating electricity and the related equipment (inverter), which is designed for AC electricity generation of 1-phase or 3-phase voltage with the operating current of up to 16A (amperes). It corresponds to a power of 3.7 kW in a 1-phase electrical network and 11.1 kW in a 3-phase network. Micro-generator parallel operation mode provides two-way exchange of electricity between the user’s electrical installation and the electrical network (electricity may flow both from the electrical network to the user’s electrical installation and in the opposite direction). Micro-generator equipment is not designed for electricity generation for commercial purposes; it is intended only for the production of electricity for one’s own needs.

Microgenerator connection implementation process

The microgenerator connection process is carried out in accordance with the procedure set forth in the Regulations Regarding the Terms of the System Connection for the Participants of the Power System (available in Latvian). In order to implement a microgenerator connection, the application for the Microgenerator connection must be submitted to Sadales tīkls. Before submitting the application, please do the following:

  • contact the Ministry of Economics and obtain a permit for implementation of new capacities or increase of capacities in accordance with Cabinet’s Regulations No. 883 (available in Latvian);
  • choose a certified microgenerator inverter, which is compliant with the requirements of the EU (European Union) standards and recognised by Sadales tīkls*, (the list is available here, available in Latvian);
  • assess the required production load;
  • consult with the local building board regarding its requirements for microgenerator installation.
Few steps left to start use of electricity produced:
1. Fill in the application Fill in the application for the micro-generator connection (with the operating current of up to 16A). Submit it in a scanned form, attach scanned copies of the documents mentioned in the application and send them to st@sadalestikls.lv (signed original send to Sadales tīkls AS, 1 Šmerļa Street, Riga, LV-1160).
2. Sign the micro-generator connection agreement Within 20 calendar days, you will receive the micro-generator connection agreement on the postal address specified in the application. Within 90 calendar days sign it and send one copy to Sadales tīkls AS, Šmerļa iela 1, LV-1160, Riga.
3. Install the micro-generator After the micro-generator agreement is signed, choose an appropriately qualified construction specialist** and install micro-generator. The customer covers all the expenses to install the micro-generator.
4. When the installation is completed, submit necessary documents to Sadales tīkls Submit Sadales tīkls

5. After the receipt of the documents, Sadales tīkls checks the compliance of micro-generator Within 10 working days after receiving all documents and attachments, Sadales tīkls will check if micro-generator is installed due to issued technical requirements, take steps to connect the micro-generator to the electrical network and draw up an act. After performing the test and prepared documentation the microgenerator may be connected in parallel with the Sadales tīkls low-voltage electrical network. Until that, it can only be connected temporarily for a test period.
6. Start to use the electricity produced!

* If the selected inverter is not included in the list of microgenerator inverters recognised by Sadales tīkls, you should first contact Sadales tīkls Metrology Laboratory, submit the required documents and submit the inverter for its inspection on request. If the inverter selected by you is compliant, the Metrology Laboratory will include it in the Sadales tīkls microgenerator inverters list.

** A person who has received the certificate of the Latvian Association of Power Engineers and Energy Constructors

The NET payment system is applied to payments for the electricity generated and consumed by the household within the existing connection. What does it mean?

The electricity NET payment system is applied to all households which install a microgenerator and generate electricity from renewable sources for their own needs, for example, by using solar cells or wind turbines, and are compliant with other criteria set forth in the Cabinet’s Regulations (available in Latvian).

Monthly electricity costs for every household in Latvia, including households subject to the NET payment system, consist of the following three components:

  • distribution system operator services,
  • mandatory procurement components,
  • electricity fee.

Households that produce electricity from renewable sources have the opportunity to save on one of the components – electricity fee.  In regard to microgenerator users, electricity fee is called NET consumption.

 

It is calculated as follows: electricity received (kWh) – electricity supplied to the electrical network (kWh)

 

 

Important! If NET consumption is negative in the payment period of a month (more kWh are supplied to the network), the accumulated amount of NET consumption is credited to the payment period of the next month as the electricity supplied to the electrical network. Conversely, if NET consumption is positive, it is made of the kWh which are included in the bill of the payment period. The NET consumption payment period is from 1 April to 31 March of the following year. A new payment period starts on 1 April, and the amount of electricity accumulated before is no longer taken into account and the metering starts again.