Grid Connection Guidelines for Infrastructure Projects

Spain just updated its grid-connection technical requirements (Orden TED/82/2026). A lot of projects won’t notice what changed until commissioning, and that’s when it turns into schedule and warranty pain. The update modifies TED/749/2020 and hits three areas hard: small generators, storage, and self-consumption. Here’s the practical view Type A generators (<100 kW): • Voltage dip ride-through aligned with Type B for both balanced and unbalanced faults (e.g., balanced: 0.05 pu for 200 ms) • Power-electronics blocking allowed during faults (1) Blocking if V < 0.2 pu (balanced) (2) Must unblock within 100 ms once V > 0.2 pu   • Active power recovery required after faults (but no mandatory fast current injection) Storage (BESS): • Until a dedicated storage code exists, BESS must meet generation requirements in both export and import modes • Temporary exemption from submitting NTS certificates in the operational notification process • The sleeper detail: blocking/unblocking and recovery behaviour now becomes a commissioning pass/fail item if your model doesn’t match the plant response The sleeper detail: Blocking/unblocking timing and post-fault recovery are now commissioning pass/fail items. If the plant response doesn’t match the accepted model, it becomes a site problem, not a study problem. Small generators connected to distribution in TNP (islands): • LVRT aligned with PO 12.2 SENP (including 0 pu for 500 ms for balanced faults) • Blocking logic per PO 12.2 (0.1 pu balanced/0.55 pu two-phase-to-ground) • RoCoF requirement: 2 Hz/s (750 ms moving window) • Frequency withstand: 47.0–47.5 Hz (3 s) | 47.5–48.0 (1 h) | 48.0–51.0 (unlimited) | 51.0–52.0 (1 h) • 9-month transitional exemption on NTS certificate requirements Self-consumption: The old technical exemption (DT3ª RD 647/2020) is now removed; full compliance required from 12 May 2026 Why this actually matters? These aren’t paperwork changes. They affect controller firmware, protection settings, fault ride-through logic, and EMT/RMS compliance models. Discovered late, they trigger redesign, retesting, and COD delay. And practically, they will separate projects that commission cleanly from projects that slip because the plant’s real fault behaviour no longer matches the model that was approved. For those active in Spain: 👉 If you discovered a gap at commissioning, would you rather (1) re-tune controls and re-test on site, or (2) accept a temporary export cap until firmware/models are updated? #GridCode #Spain #Renewables #BESS #PV #Inverters #PowerSystemStability #GridConnection

As of first of April, a new rule applies to #grid #connections at the transmission level in 🇩🇪. We move from “First come, first served” to #Reifegradverfahren (impossible to translate). TSOs have now published #maps of potentially available #sites for connection. 🔄 Previously: Whoever applied first received the connection. The result was a flood of applications. 👀 Now: applications for #BESS, data centers, electrolyzers and other large consumers starting at 100 MW are processed in #cycles, each having three #phases: an application phase, a cluster study in which all applications are assessed together, and an offer phase. Those who receive no offer can roll over into the next cycle at no additional cost. 📅 The first cycle deadline is approximately July 2026, with results expected early 2027. In case of oversubscription, project #maturity becomes decisive: site control and #permitting status, technical concept, #financial capability, and system value (co-location). #Application #costs: €50k flat fee non-refundable once minimum requirements are met, even without a connection offer plus €1500/MW realization deposit, due only upon offer acceptance. 🗺️ All four TSOs published #maps showing at which substations grid connections are (likely) available in the first cycle. #tldr; Across all four TSOs, around #39 #substations with #connection #potential can be identified in the first cycle, of which 19 are fully or medium-term available, 10 only conditionally (if a switchgear bay is built), and several with technology restrictions. The earliest realistic commissioning dates for new projects range between 2029 and 2032. TenneT Germany: 10 substations, earliest commissioning 2030–2031, latest 2036. Amprion GmbH: 10 substations, all at 380 kV, earliest commissioning 2032, several only from 2035 onwards. TransnetBW GmbH: 9 substations available in the medium term, some long-term, majority not available. 50Hertz Transmission GmbH: 11 substations where a connection is only possible if a new switchgear bay can be built. Due to existing reservation offers, new project starts will likely only be possible from 2029 onwards. ⛔️ Across all four control areas: Several of the #identified sites are approved exclusively for #load #connections — feed-in is either excluded or only possible at reduced capacity. 🎙️ In their joint press release, the four TSOs explicitly state that demand for grid connections will consistently exceed supply, regardless of the new procedure. They therefore recommend that policymakers introduce legally defined technology quotas to ensure that battery storage, electrolyzers, data centers, and industry are adequately considered. The maturity-based process creates transparency and fairness in the queue. It does not create new capacity.

Grid #connections are slowing down Europe’s clean energy transition, but there are solutions. Last week, the European Commission published the #GridsPackage, which includes a Guidance on Efficient Grid Connections. Here are some crucial points the Guidance addresses: ⚠️ Root causes of connection backlogs: ⁉️ Grid planning & development: Building new #grid #capacity takes 4–10 years, while new connection projects are usually ready in 2-3 years. Delays are due to a combination of slow #permitting procedures, #supplychain issues for certain components, and limited labor capacity. ⁉️ Transparency gaps: Customers often lack knowledge of available capacity due to limited data, particularly at the low-voltage level. Additionally, only a few Member States adopt tariffs that push connection requests to less congested areas. ⁉️ Process inefficiencies: Including first-come, first-served queues, manual processing, and speculative applications. Only 11 Member States have fully digital procedures. ✅ Promising solutions ✔️Greater #transparency and #efficient use of the grid: High-quality #hostingcapacity #maps can help plan where to connect. The EU is developing “Capacitypedia,” a pan-European platform for capacity maps and data. #Dynamictariffs, locational charges, and auditing unused reservations help free up capacity. For example, our recent blog helps explain why grid capacity data is key to electrifying road freight: https://lnkd.in/dG8QzVxq ✔️ #Prioritisation frameworks: Moving beyond first-come, first-served is possible under EU law. Criteria can include grid-friendly uses, social infrastructure, and housing, among others. ✔️ Modernized connection procedures: #Digitalising the process can speed up approvals. AI can validate data and calculate capacity, while digital twins can simulate grids to support faster and more informed decisions. Milestone-based rules, deposits, and planning prerequisites reduce speculative applications. Some countries also batch requests to streamline queues. This guidance is a crucial component of the Grids Package: timely grid access can help minimize potential connection delays, which impact electrification across all economic sectors, including industry, transportation, and data infrastructure. Addressing those issues will be crucial for meeting climate neutrality by 2050. The International Council on Clean Transportation