# Check grid capacity before you commit to a site Name the site and the MW. Noda reads the hosting capacity map and the queue for nearby substations. Where the operator publishes nothing, it estimates and says so. ## Ask what the grid can take, see what is left Noda finds the operator’s capacity map, reads the data file behind it and puts the queue beside it. The example: the 110 kV capacity around a wind site in Vaslui, Romania. **A zone figure is not a substation figure.** Transelectrica publishes one number for zone J, which covers six counties. Noda said so, and listed the projects already landing in Vaslui: about 620 MW. **Every table gets a date check.** The capacity file was updated on 10 Sep 2026. The queue table had no 2026 row, so Noda marked the 4,717 MW as indicative. ## How Noda estimates a substation’s headroom When the operator publishes no figure for a substation, Noda builds one from what is on record, marks every assumption and records each step, failed tries included. The example: the Vutcani 110/20 kV substation inside the same site. 28 steps, 6 minutes 1. **Read your saved site.** The Vutcani 110/20 kV substation sits inside it 2. **Find what already connects there.** Two licensed wind farms, 24 and 28 MW 3. **Search the connection permit register.** For other projects booked at the substation 4. **Find the line type in the zone.** From a nearby project’s connection study 5. **Map the lines around the site.** Power lines and the substation, from OpenStreetMap 6. Dead end: The turbine map query. Timed out. Retried with a lighter query. 7. **Rate each part that can limit it.** The 110 kV line and the transformer, two standard builds 8. **Write the estimate.** Each input marked: from a record, or assumed 9. Dead end: First build of the report. It stopped. Built it again. 10. **Put the report and the chart in your project.** 11. **Show the turbines that use it, on your map.** **Result.** 8.3 MVA of headroom if the substation has one 63 MVA transformer, 16.7 to 25.3 MVA if it has two of 40 MVA. 52 MW already connects there. Asked to show the math, Noda dropped its first working figure of 15 MVA, because no build gives that number. ## Read the math, check every input Each input keeps its standing: read from a record, or assumed with no source. Pick a highlight on the page or in the list to see how Noda got that line. ## Then ask the operator for the number Two facts decide the headroom, and only the grid operator holds them. Noda drafted the request: a Romanian letter for your letterhead and an English copy for your team. Nothing is sent. The letter asks six things, in the order the operator will answer them 1. **The capacity left at the 110 kV busbar** Stated against a 30 MW injection, with the most that fits if 30 MW does not 2. **The rating and count of the transformers** This picks the branch in the headroom math 3. **The 110 kV outgoing circuits** With the conductor section and its thermal rating 4. **Capacity already contracted or allocated** And the plants already connected there 5. **The connection voltage and the delimitation point** 6. **Whether reinforcement is needed** And who pays for it Delgaz Grid’s website blocked automated reads, so the letter marks the operator’s address as unverified and asks you to check it before you post it. ## Use cases for checking grid capacity Each one opens Noda with a first message you can change before you send it. - **Compare grid connection options** Nearby lines and substations, ranked with the evidence - **Plan the grid connection application** The application route, its documents and its dates - **Size a battery for my project** Power and energy sizes for your use and grid limits - **Screen a possible site** Grid, land and environment before you pay for a study ## Questions about checking grid capacity Something else? Write to [hello@noda.energy](mailto:hello@noda.energy). ### What is a hosting capacity map? A map or table where a grid operator publishes how much new generation or demand each zone, substation or feeder can take without reinforcement. Each operator builds it its own way: MW per substation, a colour class, one total per zone, or a data file behind a map. EU rules ask transmission operators to publish this capacity at least monthly and distribution operators at least quarterly. Noda reads the file behind the map and notes its date. ### Is the published capacity the headroom at my substation? Often it is not. In the recorded Vaslui run, Transelectrica published 1,875 MW for zone J in 2026, one figure for six counties. About 620 MW of projects were landing in Vaslui alone, so the substation you pick decides more than the zone does. Noda says which level each figure applies to: zone, substation or line. ### Why does the interconnection queue matter? The queue is the list of projects that applied before you, and capacity on a map can already be promised to them. In the Vaslui run, zone J had 4,717 MW in its queue against 1,875 MW published. The 2,886 MW still in studies and requests was not deducted yet, so the zone was oversubscribed about 2.5 times. Noda reads the queue beside the capacity and checks the date of each table. ### What does Noda do when the operator publishes nothing for a substation? It estimates and says so. In the Vaslui run, no figure existed for the Vutcani 110/20 kV substation. Noda took the 52 MW already connected from the licence register, carried both standard transformer builds and gave two outcomes: 8.3 MVA, or 17 to 25 MVA, decided by one piece of equipment. Each input is marked as read from a record or assumed. ### Can Noda ask the grid operator for the real number? It drafts the request, and you send it. In the Vaslui run, Noda wrote a letter to Delgaz Grid in Romanian, with an English copy, asking for the available capacity against 30 MW, the transformer rating and the number of 110 kV circuits. It flagged the operator's address as unverified, because the operator's website blocked automated reads. ### Does this work outside Romania? Yes. Noda works in any country. It looks for the records each operator keeps: a capacity map, a queue or register, a development plan. The names differ by country, so Noda also searches in the local language, for example "capacidad de acceso" in Spain. Where a record is only given on request, Noda says so and drafts the request. ## Which substation should Noda check? Ask in your own words. You can attach a PDF, KML, GeoJSON, CSV or Excel file. Have an account? [Log in](https://app.noda.energy/login) --- This is the Markdown version of https://noda.energy/grid-capacity (Hosting capacity map and interconnection queue checks | Noda). Check substation capacity near a site. Noda reads the hosting capacity map and the interconnection queue and shows the headroom with its source. More: [all pages](https://noda.energy/llms.txt) · [API and developer docs](https://noda.energy/docs) · [contact](https://noda.energy/contact)