CGES (Montenegrin Transmission System)
TSO - Montenegro
Publication info
| Status of publication | Published |
| Link to website | https://www.cges.me/o-nama/karta-prenosnog-sistema/prikljucenje-na-prenosnu-mrezu |
| Accessibility | Open |
| Regional Scope | Country |
| Spatial granularity | Nodal (substation) |
| Operator voltage level scope | Only TSO level (110, 220 and 400 kV) |
| Timeline for which HC is provided | Actual grid model |
| Information format | Map |
| Categories of grid users considered | Generators only |
| Type of grid connection capacity information | Available |
| Availability of API | Openly available |
| Update Cycles | Yearly |
| Available language | National language(s) only |
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 is the fully guaranteed grid access capacity, available at all times under N and N-1 conditions, with the own connection bay and without operational curtailment. It is defined through connection studies (load flow, voltage, short-circuit and stability analyses) and requires fully developed connection infrastructure. |
| Description of the methodology that leads to firm capacity results | The calculation utilises one actual representative model of the Montenegrin power system combined with other models of the synchronous area of continental Europe. A virtual power plant with a large installed capacity is modelled at the connection point. The plant’s production starts at 10 MW, with the nearest Hydro Power Plant (HPP) output reduced by 10 MW. Power flow calculations and N-1 system safety analyses are conducted. If no system element overload occurs, the virtual plant’s power increases by 10 MW, and the nearest HPP output is reduced by the same amount. This iterative process continues until an overload is detected. ΔCG is defined as the virtual power plant’s capacity in the penultimate iteration. |
| Description of what flexible capacity means and the aspects that structure the definition | Flexible capacity is a non-fully guaranteed grid access capacity, where output may be curtailed under specific system conditions (e.g. N-1, congestion), based on TSO dispatch instructions. It enables earlier connection with partial infrastructure and has been recently introduced in the legal framework to improve network utilization and accelerate RES integration. It allows connection with T-junction in the temporary period up to construction of full infrastructure according to recently updated Grid code. |
| Description for the criteria and methodologies used that lead to the published information | The maximum theoretical connection power for generation (GTCG) and load (GTCL) is calculated as GTCG = BCG − BCL + ΔCG, where BCG is base case generation power and BCL is base case load power; ΔCG is calculated as explained above. Remaining transmission capacity for generation (RTCG) is calculated as RTCG = GTCG − TRMG − AACGmax + AACLmin, where GTCG is the maximum available generation connection power, TRMG is the reliability margin for generation power flow calculations, AACGmax is the reserved connection power for generation, and AACLmin is the minimum recorded load at the connection point under normal conditions in the last 36 months. Only RTCG data are published. |
| Main assumptions/disclaimers behind calculations | The assumptions on the model level reflect the system’s state on a working day in March–April of the previous year. It incorporates the usual topology and switching state of Montenegrin system elements. Initial engagement of Montenegrin HPPs enables the necessary adjustments for potential capacity increases (ΔC), as explained above. Other constraints include the spatial and technical limitations of substations or line connections, availability and limitations of planning documentation, as well as social, environmental, and other relevant factors. These assumptions are usually not included. |
Additional information for connection request and hosting capacity information
| Connection request procedure | The connection procedure is simple and defined by the Energy Law and the Transmission Grid Code. The procedure begins with the submission of a request for connection (a completed form with additional documents such as urbanistic conditions, single-line diagram, technical data, etc.). At the expense of the investor, CGES develops a connection study, in which power flows in the N and N-1 modes, voltage-reactive conditions, short-circuit currents, and dynamic analyses are checked. Then, CGES and the investor agree and sign an agreement on the construction of connection infrastructure and connection, with the payment of the connection fee (from €1.17/kW for 400 kV to €6.26/kW for the 110 kV voltage level). The agreement defines the connection point as the connection infrastructure (from the connection point to the CGES network) that can be constructed by the investor or CGES. The internal installations of the power plant (from the point of connection to the power plant) are always constructed by the investor and represent his asset. Upon signing of the subject agreement, it is necessary to build the power plant, internal installations, and connection infrastructure over a several-year period. After the works are completed in accordance with the agreement, the investor shall inform CGES that the contractual obligations have been fulfilled, which is then followed by temporary and then permanent system connection. |
| Options available for the investors if the map shows 'no capacity available' in their interested area | The map is only indicative based on all of the above assumptions. In parallel, CGES is working on reinforcing the infrastructure to integrate large-scale RES. |
| Connection request rules | First-come-first-serve |
| Information published for volumes of connection requests/waiting lines | No |
Relevant references/Links/Additional material
Connection request process
Auxiliary documents
Legal references
Contact point for hosting capacity information
No contact point defined - development and investment sector in charge
Contact point for connection requests
No contact point defined - development and investment sector in charge