Microgenerator connection

Topical!

Starting from July 1 of this year, the implementation, restoration of electricity connection and load changes, as well as microgenerator connection is even more rapid, convenient and simple! The Public Utilities Commission (PUC) in cooperation with Sadales tīkls has made significant changes to the regulations to improve the procedure of receiving services and the methodology for determining fees. For your convenience the new version of the regulations is available here.

We will implement the applications for microgenerator connection and generation capacity changes submitted before June 30 in accordance with the procedure in force at the time of their submission.

 

To produce 100% green energy for your home or business, you have the opportunity to add a microgenerator that produces electricity using solar panels or a wind generator to your electricity connection. Before connecting the equipment, a permit must be obtained from Sadales tīkls, indicating that the functioning of the microgenerator will not cause interference in the common electrical network.

Technical parameters of the microgenerator

The electricity generation equipment such as solar, wind systems and related equipment (inverter) intended for the production of AC electricity, which is designed for AC electricity generation of 1-phase or 3-phase voltage with the operating current of up to 16A (amperes), is considered to be a microgenerator. It corresponds to a power of 3.7 kW in a 1-phase electrical network and 11.1 kW in a 3-phase network. Microgenerator parallel operation mode provides two-way exchange of electricity between your electrical installation and the common electrical network (electricity may flow both from the electrical network to the user’s electrical installation and in the opposite direction).

Once the solar panels or a wind generator have started to produce green energy, the electricity which the manufacturer does not consume immediately is transferred to the common electrical network. Business customers should agree in a timely manner with the electricity trader on the sale of all the energy transferred to the network. When households start electricity generation, they automatically become participants of the net payment system, but they may also refuse this status and agree with their electricity trader on the sale of energy produced and transferred to the network.

Net payment system

Within the framework of the net payment system, households may use the energy transferred to the electrical network when electricity is not generated or the amount of electricity generated is not sufficient, for example, during the night hours, during the winter period.

Monthly costs of electricity for any Latvian household include three items:

  • services of distribution and transmission system operators;
  • mandatory procurement components (MPC): fixed part (in accordance with the connection capacity) and the variable part (renewables, cogeneration);
  • payment for electricity.

The households producing electricity from renewable energy sources can save on two of these items – the payment for electricity and the variable part of MPC.

 

The net consumption is calculated as follows: received electricity (kWh) – electricity transferred to the network (kwh)

 

Important to know!

If more kWh are transferred to the network within a one-month payment period, the accumulated amount of electricity is diverted for consumption in the next month. Conversely, if more kWh are received, the difference between the consumed electricity and that transferred to the network, are the kWh which are included in the electricity bill for the payment period.

The payment period within the net payment system is one calendar month. The transferred electricity should be used within the framework of one year, which lasts from 1 April to 31 March of the next year. All the savings are deleted, when a new payment year starts. The net payment system is functioning only within the framework of one distribution system services agreement – the energy transferred to the network can be used only in the property, where it was generated. If the agreement changes, the savings are deleted.

For convenience of customers, a net electricity report is available on the customer portal e-st.lv

Important preliminary works

1. Determine the most suitable capacity.

Evaluate the electricity consumption data and your habits on the customer portal e-st.lv. Select a microgenerator with the most suitable capacity. Remember, you won’t be able to fully use machines with excess generation capacity. Calculate how long you will recover your investment. Investment will pay off more quickly if the energy produced is consumed immediately.

Consult with a certified construction specialist and make sure that the technical parameters of the electricity connection are consistent with the generation capacity of the solar panels or the wind generator to be installed.

2. Select a certified generating unit.

When looking for the most appropriate solar panels or wind generator, please consider that only the inverters that are certified and included in the list of inverters recognised by Sadales tīkls can be connected in parallel work to the electrical network.

3. Learn the requirements of the construction board.

Study the conditions for installation of microgenerators set by the local construction board.

If you have any questions, apply for an e-consultation with an individual expert.

 

Microgenerator connection implementation process

1.
Application
Customer’s tasks
  • Apply for microgenerator connection on the customer portal e-st.lv.

 

Tasks of Sadales tīkls
  • If you have selected an inverter included in the list of inverters recognised by Sadales tīkls, within three working days we will provide a reply on the possibility of connecting the new generating unit to the existing electrical network or the need to reconstruct the electrical network.
  • The evaluation of the inclusion of other inverters in the list of inverters recognised by Sadales tīkls will require up to five more days.
2.
Technical requirements and reconstruction works
Customer’s tasks

 

Tasks of Sadales tīkls
  • In some cases, the connection of a microgenerator will require reconstruction of the electrical network and the development of a construction project. Then, we will prepare technical requirements and an approximate cost estimate of electrical network reconstruction free of charge within three days. Read more information about the construction of a new connection, reconstruction of the existing connection or load changes here.
3.
Payments
Customer’s tasks
  • Pay the invoice attached to the application for microgenerator connection on the customer portal e-st.lv. Connection expenses: 74,69 EUR, t.sk. PVN.
  • In case of reconstruction of the electrical network, you should first receive a connection agreement and an invoice for reconstruction works, and you will get the microgenerator connection invoice only after the reconstruction works are over.
4.
Implementation
Customer’s tasks
  • Select a certified construction specialist, entrust him with the technical work for installation of the microgenerator, ask him to prepare an inverter settings protocol. When the microgenerator is ready for parallel work with the electrical network of Sadales tīkls, confirm this on the customer portal e-st.lv. Attach a copy of the construction specialist’s certificate and a completed inverter settings protocol. Meet the deadline set in the general technical requirements!
5.
Connection permit
Tasks of Sadales tīkls
  • We will check the submitted documents and prepare a permit for the inclusion of the microgenerator in parallel work with the electrical network of Sadales tīkls AS no later than within five working days.

 

Customer’s tasks
  • When you receive the permit, activate the microgenerator, generate electricity and use the advantages of the net payment system.