Connection to the grid

• Grid Code
• ELTS
• TSO Elering Grid Connection Methodology
• Guide to Connecting to National TSO

The application for grid connection has to be submitted to the TSO Elering or the DSO. According to the relevant Estonian regulation (TSO Elering Grid Connection Methodology), all project developers have to bear grid connection costs themselves.
As a general rule, installations exceeding rated power of over 1 MW need approval by the TSO for grid connection. For wind turbines and PV installations, the standard is lower: all installations with a capacity of more than 200 kW need approval from the TSO and they can then be connected either to the TSO or DSO. All wind turbines and PV installations with a capacity exceeding 10 MW can be connected to the TSO only (art. 18 Grid Code). It is the responsibility of the DSO to inform TSO of installations to be connected to the network and provide information on their technical data (art 19 Grid Code).
After submitting the application for grid connection, the process unfolds in the following steps:
• acceptance of the application
• entering grid connection agreement
• building the connection point
• supplying electricity
• synchronising testing and
• final grid connection contract. The final grid connection contract requires that the testing period has been successfully completed, the production unit has received the certificate of conformity to the grid code and the production unit models have been verified (Guide to Connecting to National TSO).

Statutory law does not give priority to renewable energy. The grid operator has to respect the principle of non-discrimination when providing grid services to the market participants (Art 65 par. 2 ELTS).