Elering
TSO - Estonia
Publication info
| Status of publication | Published |
| Link to website | https://vla.elering.ee/ |
| Accessibility | Open |
| Regional Scope | TSO area |
| Spatial granularity | Nodal (substation) |
| Operator voltage level scope | TSO – 110 kV and 330 kV |
| Timeline for which HC is provided | Snapshot with all certain grid investments in the next 5 years. When a specific investment object is clicked, the map shows the year from which it became available for grid connection. |
| Information format | Map |
| Categories of grid users considered | Generators and demand |
| Type of grid connection capacity information | Reserved, pre-reserved, considered |
| Availability of API | Not provided |
| Update Cycles | When needed |
| Available language | National language(s) + others including English |
| Additional information | Shows only estimated cost, topology is simplified |
Hosting capacity assessment
| Capacity type considered for hosting capacity information | Firm |
| Description of what firm capacity means and the aspects that structure the definition | Firm capacity means the guaranteed grid capacity in the connection point |
| Description of the methodology that leads to firm capacity results | Firm capacity means that the TSO guarantees the use of the requested network capacity at all times for the client, while taking the N-1 criteria into account. |
| Description of what flexible capacity means and the aspects that structure the definition | Flexible capacity means the contractual grid capacity in the connection point which usage the TSO has the right to limit in order to prevent the overloading of the grid elements. The specifics of limiting the usage of the flexible grid capacity is agreed upon in the connection and network agreement. |
| Description of the methodology that leads to flexible capacity results | The TSO’s methodology does not define flexible capacity. The TSO guarantees the connection capacity as “firm capacity”. In order to guarantee grid capacity, the TSO pre-develops the grid by considering the project perspective. If curtailments are required, the client will be compensated for the set limitations for injection capacity (injection capacity is always firm capacity). |
| Description for the criteria and methodologies used that lead to the published information | In order to pre-develop the grid to provide firm capacity, the TSO plans grid investments accordingly, using static analyses and considering NDPs. Based on the NDP, different scenarios are developed, taking into consideration time horizons where different RES plans are in operation. In addition to scenarios, different regimes are also considered, for example, production location, which generation module is producing, etc. The regimes help identify problems in the grid, such as voltage issues. The base data also includes statistics about locations where RES production is possible. We also publish information about existing substations, whether they are expandable for the new connections, and new planned substations. |
| Main assumptions/disclaimers behind calculations | Published connection possibilities are available in our interactive map, with the indicated connection costs. The grid reinforcement cost, as specified in the TSO price list, will be paid based on the requested capacity. Published hosting capacity data is non-binding in our interactive power grid map, which shows available grid capacity . To reserve or acquire connection capacity, a formal application must be submitted and approved by Elering in accordance with the Transmission Grid Code. |
Additional information for connection request and hosting capacity information
| Connection request procedure | The applicant must submit a connection application to the TSO. After the connection process invoice is paid, the TSO will issue a connection contract to the applicant. Detailed information can be found here: https://elering.ee/en/application-and-contract-0 |
| Options available for the investors if the map shows 'no capacity available' in their interested area | Available capacity does not affect connection costs. Investors may request further information regarding connection possibilities and prices from the TSO. |
| Connection request rules | First-come-first-serve |
| Information published for volumes of connection requests/waiting lines | Yes |
| Granularity of published connection requests/waiting lines | Per technology, capacity, and location of the connection point (TSO substation) |
Relevant references/Links/Additional material
Calculation method, disclaimers, and boundaries
Connection request process
Auxiliary documents
Legal references
Contact point for connection requests