Presentation · EN — 26-slide Siemens Energy Grid Technologies Service presentation (16:9, Unrestricted, 2026) on micro substations: transportable skid-mounted substations that connect directly to an existing high-voltage transmission line and transform power to a customer-ready level in one step. The deck widens the published brochure envelope: voltage levels from 72.5 kV up to 550 kV, power supply from 50 kVA up to 10 MVA, single-phase and three-phase options, roughly 70% area reduction compared to a conventional 220 kV substation bay, and a single-phase skid with transport dimensions of approx. 8.8 x 2.4 x <3 m (total height with truck <4 m, approx. 6.4 m from ground once the SSVT is upright on site). It covers the market driver (770 million people without electricity access; EV charging points expected to grow from 1.4 million to 9.2 million by 2035), the single-phase and three-phase concepts device by device, the Siemens Energy delivery scope from basic solution through turnkey to operation & maintenance (including an as-a-service concept), EV-charging applications, and future trends: the SF6-free blue portfolio (clean air + vacuum, GWP < 1, zero liquefaction at -60 °C, 1,500 units with more than 20 million operating hours), Sensgear/Sensformer digitalization, and combining a micro substation (1 MVA) with a QSTOR battery energy storage system on a 1500 V DC / 400 V AC architecture to meet peak demands.
The presentation opens with the market driver (slides 3-4): 770 million people worldwide are without access to electricity, and most of them are located in remote areas — a massive demand for fast, clean & affordable electrification solutions. On the mobility side, electricity demand for EV charging stations is rising: EV charging infrastructure is expected to grow from 1.4 million to 9.2 million charging points in 2035.
The overview slide (slide 6) defines the micro substation: directly connected to the high-voltage grid, this substation transforms power to a customer-ready level in just one step — delivering reliable energy directly to the end customer. Applications listed: rural electrification; EV charging stations; construction sites; large parking lots and company fleets; electric river boat docks; 5G antennas; and any application that needs power close to a transmission line.
Key features (verbatim): turnkey installation with minimum of electrical & civil works, transportable solution (hardware: power VT, high-voltage equipment, cabling, control & protection, low-voltage panel); clean-air technology — Siemens Energy blue portfolio; application with battery storage system to meet peak demands; scalable and modular solution with the possibility to start with a lower power and increase in the future.
Package scope: planning, design, installation, commissioning, delivery up to implementation of the micro substation — a tailor-made solution, with the possibility to offer an "as a service" concept; operation and maintenance covers site management, customer hotline, 24/7 support, spare parts management and preventive maintenance. The slide's quantified optimization and flexibility claims are transcribed in the table below.
| Claim (slide 6, verbatim) | Value |
|---|---|
| Voltage levels | From 72.5 kV up to 550 kV |
| Power supply | From 50 kVA up to 10 MVA |
| Phase options | Single-phase and 3-phase options; possibility of a transportable, mobile solution |
| Area reduction | Approx. 70% area reduction compared to a conventional substation bay in 220 kV (example) |
| Deployment | Faster deployment time compared to conventional substation; minimum civil works required; pre-assembled and tested concept |
The design-and-concept slide (slide 7) lists the benefit set: minimum civil works required; transportable solution; one step from high voltage to low voltage; applicable solution with Blue technology; pre-assembled and tested concept; and faster deployment time compared to a conventional system.
For grid operators it frames the value as expanding potential for TSOs through the technology's value and benefits: electricity accessibility to overcome different applications such as electrifying remote areas by a direct connection from the existing transmission grid; application with battery storage to meet peak demands; and improving grid resilience and recovery from unpredictable grid disturbances such as severe weather events.
The single-phase solution (slide 9) mounts all devices on one transportable skid; the SSVT is put to an upright position on site. Devices from left to right: surge arrester, insulator, disconnector, SSVT, distribution cubicle. Not shown on the renders: fence, earthing grid, connection to the overhead line (OHL), and low-voltage cabling. The slide contrasts an operational configuration (SSVT upright) with a transportable configuration (SSVT laid down on the skid), with reduced civil work as the headline; dimensions are transcribed in the table below.
Two full-slide renders (slides 10-11) show the same single-phase skid loaded on a standard truck trailer leaving the factory and parked at a roadside site under an overhead line — the transport concept: the complete substation travels as one trailer load.
| Dimension (slide 9, verbatim) | Value |
|---|---|
| Transport dimensions L x W x H | Approx. 8.8 x 2.4 x <3 m |
| Total height with truck | <4 m |
| Total height from ground (operational, SSVT upright) | Approx. 6.4 m |
| Total length | Approx. 8.8 m |
| Total width | Approx. 2.4 m |
The three-phase solution is presented as a standard concept (slide 8) with two visuals: a CAD layout of the complete fenced bay — incoming overhead-line connections, insulators and switching equipment on structures, three transformer tanks and an equipment cubicle with access platform inside a perimeter fence — and a photorealistic render of the same fenced three-phase micro substation installed on a green-field site directly under the transmission line. The slide carries no ratings text beyond the title; the three-phase power and scalability figures are stated on the overview slide (up to 10 MVA, scalable and modular, slide 6).
The scope slide (slide 12) tiers the Siemens Energy offering in three levels. Basic solution: design the concept & engineering, installation & commissioning, tools, field-service coordination. Turnkey projects: transportation, civil works, earthing systems, fences and more. Operation & maintenance: site management, customer hotline, 24/7 support, spare parts management, preventive maintenance.
The EV-charging application slide (slide 14) names four deployment venues for micro substations feeding charging infrastructure: highway service stations, public transport fleets, logistics operators' centers, and large parking lots. The deck's subsequent EV-charging case-study slides present a specific licensed e-charger deployment and partnership with a named transmission system operator; their content is omitted from this entry per the no-customer-names guardrail.
The blue portfolio is based on game-changing technology: vacuum switching and clean air insulation (slide 21). Vacuum interruption offers zero toxic decomposition products in a hermetically tight interrupter, highest switching performance without degradation, scalable short-circuit current capabilities, and zero maintenance (sealed for life). Clean air (N2 + O2) insulation offers zero CO2 emissions and the lowest CO2 footprint (GWP = 0), zero toxicity with highest stability and easiest gas handling, zero liquefaction at low temperatures down to -60 °C, and zero patent dependencies with multiple suppliers — clean, safe and future-proof regarding F-gas and PFAS regulation.
The companion slide "Replacing SF6 in high voltage — we are doing it with clean air" (slide 22) adds the fleet evidence: proven technology with already 1,500 units and more than 20 million hours successfully in operation; GWP < 1 — clean air gives the equipment the lowest carbon footprint across its life cycle; peak performance & safety — highest switching performance, zero toxic by-products, fully compliant with IEC and ANSI/IEEE; suitably sized — the clean air units fit within the footprint of the SF6 units they replace; and future-proof — Blue switchgear answers the EU F-gas regulation (GWP < 1) and is not impacted by any restrictions or obligations of the revised EU F-gas regulation or expected PFAS restrictions.
"From products to system intelligence — converting switchgear into Sensgear" (slide 23): besides general data such as local weather information or GPS location, the technology provides equipment-specific data. Sensformer with Sensgear: oil level alarm, top oil temperature, low-voltage winding current. GIS and circuit breaker with Sensgear: gas density; CB counter, position, readiness; temperature (local control cubicle). Surge arrester and disconnector with Sensgear: surge counter and leakage current (arrester), drive current (disconnector). The promise is added transparency, enhanced productivity and advanced intelligence — software apps and digital services; data generation, collection, analysis and utilization; secure data transmission through GSM to cloud with state-of-the-art cyber security measures.
The closing concept combines micro substations and BESS (slide 24). Its single-line diagram shows the 72.5 to 550 kV transmission connection into a 1 MVA micro substation, a QSTOR storage block on a 1500 V DC link coupled through a converter to a common 400 V AC bus, and the charger fed from that bus through its own converter — the battery covers peak demands beyond the transformer rating. The slide pairs the fenced three-phase micro substation render with a QSTOR outdoor battery cabinet.
Click any figure to enlarge.