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Capacity type considered for available hosting capacity information (e.g., Firm and/or Flexible)
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Firm
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Description of what firm capacity means
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Saturation level of HV/MV transformers considering connection requests and historical load-generation
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Description of the aspects/methodology that leads to firm capacity results
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Methodology described below
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Description for the criteria and methodologies used that lead to the published information
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The maps primarily deliver a qualitative assessment of hosting capacity, based on a colour-coded classification of grid criticality:
- Red: highly critical areas
- Orange: medium criticality
- Yellow: low criticality
- White/green: very low criticality
Criticality levels are determined by comparing requested capacity (Pimm) with available capacity margins derived from Pcmin (minimum load observed in the area) and Pn (total installed capacity of HV/MV transformers).
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Main assumptions/disclaimers behind calculations
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The information is mainly presented through a colour-coded classification of grid criticality at area level:
- in yellow, the areas supplied by primary substations under normal operating conditions (standard configuration), for which Pimm > 0.5 × Pcmin;
- in orange, the areas supplied by primary substations under normal operating conditions (standard configuration), for which Pimm > Pcmin;
- in red, the areas supplied by primary substations under normal operating conditions (standard configuration), for which Pimm – Pcmin > 0.9 × Pn. These are identified as critical areas;
- in white, the other areas
Important assumptions:
- area refers to a province;
- Pcmin is the minimum load power, defined as the load power of the area during the quarter-hour corresponding to the regional minimum peak;
- Pn is the sum of the rated powers of all HV/MV transformers installed in the primary substations supplying the area;
- Pimm is the sum of the requested injection powers, corresponding to the connection offers sent to applicants.
At HV/MV nodes level the information is mainly presented through a colour-coded classification of criticality:
- in geen: HV/MV nodes showing no evidence of energy reverse flow from the e-distribuzione grid to the National Transmission Grid;
- in yellow: HV/MV nodes showing an energy reverse flow with a maximum power injected into the National Transmission Grid below the warning limit;
- in orange: HV/MV nodes showing an energy reverse flow with a maximum power injected into the National Transmission Grid above the warning limit;
- in red: HV/MV nodes saturated.
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