The advance of electric mobility has radically transformed the traditional concept of a service station. The transition towards electric vehicles requires infrastructure capable of supplying high power energy in short periods of time, adapted both to urban environments and to major transport corridors.
In this context, the EV charging station is positioned as a fundamental asset in the public and private charging network, combining power engineering, smart management systems and advanced communication protocols.
What is an EV charging station and how does it work?
When considering what an EV charging station is, the technical definition describes it as a public or private access charging station equipped with multiple medium and high power electricity supply points. Unlike a conventional residential alternating current (AC) charger, a public station is designed to manage simultaneous energy demand and offer fast and ultra rapid charging services.
To understand how an EV charging station works, it is necessary to analyse the transformation of energy from the distribution grid to the vehicle battery:
- Grid connection and transformation: energy arrives from the medium voltage grid at the installation’s own transformer substation, where the voltage is reduced to commercial low voltage.
- Current conversion (AC to DC): in fast chargers, alternating current (AC) from the grid is converted internally into direct current (DC) by high efficiency rectifier modules integrated into the charging cable itself or into separate power cabinets.
- Vehicle battery management: by supplying direct current directly to the vehicle battery, the car’s on board charger, or OBC, is bypassed. This removes the car’s internal power limitation and allows energy to be injected at high power levels, above 150 kW.
- Communication protocols: through standardised interfaces such as CCS Combo 2 or CHAdeMO, and under communication standards such as ISO 15118 and OCPP, Open Charge Point Protocol, the station and the vehicle continuously negotiate the charging curve, cell temperature and maximum permitted current limit.
A typical site at a service station next to a motorway requires a dedicated connection of at least 500 kVA, capable of simultaneously supplying four 120 kW charging points with dynamic power balancing to avoid voltage drops in the local grid.
Types of EV charging stations and fast charging points by power
The classification of this infrastructure does not depend on the external design, but on the electronic architecture and the capacity to transfer energy per unit of time.
Semi rapid alternating current charging hubs (11 kW to 22 kW)
They supply energy in alternating current, using the vehicle’s own on board charger to convert it to direct current. They are installed in locations where dwell times are longer, such as public car parks, shopping centres or corporate car parks. In a shopping centre with 10 spaces equipped with 32 amp three phase sockets, 22 kW AC, a compact vehicle such as a Renault Zoe, fitted with a 22 kW on board charger, or a Nissan Leaf can recover around 100 km of range in approximately one hour. It is also the usual format for charging plug in hybrid models such as the Cupra Formentor e Hybrid or the Volvo XC60 Recharge.
Fast direct current charging (50 kW to 150 kW)
This is the operational standard in peri urban areas and on secondary roads. They use DC conversion cabinets that make it possible to charge 80% of a 60 kWh battery in a range of between 25 and 40 minutes. They are the ideal option for intermediate stops on interurban journeys with models such as the Peugeot e 208, Volkswagen ID.3, MG ZS EV or commercial delivery vehicle fleets such as the Citroën ë Berlingo.
Ultra rapid and high power HPC charging (150 kW to 400 kW+)
They represent the standard for fast charging stations on major road corridors. These High Power Charging stations use liquid cooled cables to withstand continuous currents of up to 500 amps without overheating the cable. In a 350 kW infrastructure, vehicles with 800 volt electrical architecture such as the Porsche Taycan, Hyundai Ioniq 5, Kia EV6 or Audi e tron GT can recover 80% of their charge in under 18 minutes, while popular 400 V models such as the Tesla Model 3 or BMW i4 make use of the maximum ceiling of their sustained charging curve.
Advantages and disadvantages of EV charging stations
To assess the feasibility and convenience of this infrastructure, it is necessary to weigh both its technical strengths and the conditions that affect its operational deployment.
| Advantages | Disadvantages |
| High speed energy transfer in direct current | High initial investment, CAPEX, in equipment and transformer substation |
| Zero direct local emissions during the supply phase | Longer stopping times than refuelling with fossil fuels |
| Integration of renewable energy and local storage, BESS | Direct dependence on the available capacity of the distribution grid |
| Lower cost per kilometre travelled compared with fossil fuels | Administrative complexity and long legalisation timescales |
| Remote monitoring and predictive maintenance via OCPP protocol | Variability in the charging curve depending on battery temperature |
At an operational level, the great strength of a charging station lies in its ability to offer clean energy in an automated and unattended way, while also allowing photovoltaic generation to be integrated into canopies to reduce consumption from the grid. This enables corporate fleets and private drivers to make electric vehicle use profitable on long distance journeys.
By contrast, the main obstacle remains the bottleneck represented by grid connection procedures with distribution companies and the high financial investment required. Likewise, although HPC technology has drastically reduced waiting times, the final charging speed still depends on the thermal management of each car’s battery, which requires proper planning of route stops.
Grid architecture and power management: the internal infrastructure
The greatest technical challenge when designing a high power charging station does not lie in the charging posts themselves, but in the capacity of the electricity grid at the connection point. To solve power restrictions and avoid extra costs from contracted capacity charges, modern engineering integrates three key elements:
- Dynamic Load Management (DLM): control algorithms that distribute the available power from the transformer substation in real time among the connected vehicles. If four cars connect simultaneously at a station limited to 300 kW, the system modulates delivery according to the state of charge, SoC, of each one.
- Battery Energy Storage Systems (BESS): stationary lithium batteries, from 100 kWh to 500 kWh, that act as an energy buffer. They charge gradually from the grid during off peak hours and discharge their energy quickly when a car requests 250 kW, reducing the peak demand placed on the grid, known as peak shaving.
- Photovoltaic integration: canopies with solar panels that provide local distributed generation in direct current, reducing dependence on the grid during the hours of highest radiation.
A station located in an industrial estate with grid capacity limited to 150 kW can install a 200 kWh BESS and a 50 kWp photovoltaic canopy. With this hybrid architecture, the station can offer charging peaks of up to 300 kW to two vehicles in parallel without exceeding the 150 kW contracted with the distribution company.
Location and availability: where there are EV charging stations and how to find them with Google Maps
When planning routes or assessing the feasibility of new projects, it is essential to analyse the current density of the charging network. If you are wondering how many EV charging stations there are in Spain, sector data reflects constantly expanding infrastructure that exceeds 38,000 operational public charging points, although distribution is not uniform: the highest density is concentrated on the main peninsular corridors, A 1 to A 6, and in large metropolitan areas.
For users who need to know where EV charging stations are in real time, data interoperability is managed through open protocols such as OCPI, Open Charge Point Interface. This allows the databases of charge point operators, CPOs, to synchronise with navigation and map applications:
- Map integration: searching for EV charging stations on Google Maps has become the most immediate consultation tool, as the platform shows not only the physical location, but also the connector type, Type 2 or CCS2, the output power in kW and real time occupancy status.
- Mobility apps (MSPs): specialised applications allow users to filter by charging speed above 100 kW, reserve a point and authenticate payment automatically through the Plug & Charge standard.
Economic analysis: cost of an EV charging station and investment options
The financial analysis of the infrastructure must address both the capital investment required for its construction and the service tariff paid by the user, which competes directly with the costs of traditional fuels.
Charging and the cost of installing an EV charging station
When checking the price of an EV charging station for the user, tariffs vary according to the power supplied and the operator. To answer how much it costs to charge a car at an EV charging station, the average range varies between €0.25/kWh at semi rapid points, AC, and €0.55/kWh to €0.79/kWh at ultra rapid direct current points, DC. Therefore, filling a standard 60 kWh battery at an ultra rapid point costs approximately between €33 and €45.
From the perspective of the investor or developer, the main question is how much it costs to build an EV charging station from scratch. The cost of an EV charging station varies substantially depending on the scale of the project and the electrical infrastructure required.
| Type of installation | Installed power | Estimated CAPEX (Equipment + Civil works) | Connection rights and transformer substation | Main business model |
| Urban hub (4 AC sockets) | 44 kW to 88 kW AC | €12,000 to €25,000 | €5,000 to €10,000 | Loyalty / Parking |
| Fast DC station (2 points) | 100 kW to 150 kW DC | €60,000 to €110,000 | €20,000 to €45,000 | Direct sale of energy |
| Ultra rapid HPC hub (4 to 8 points) | 600 kW to 1.2 MW DC | €250,000 to €600,000+ | €80,000 to €200,000 | High turnover on corridor |
As the table above shows, the total budget does not depend only on the cost of the chargers. Civil works, trenches, foundations and ducting, and the installation of the transformer substation represent between 35% and 50% of the total investment in HPC installations.
When defining profitability, the relationship between EV charging stations and price must be calibrated by seeking a balance between gross margin per kWh and the daily utilisation rate of the charging posts. Ultra rapid stations base their economic model on maximising vehicle turnover, shortening the occupancy time per bay.
Cost comparison: electric charging versus petrol and diesel volatility
In a context marked by instability in the oil market, geopolitical conflicts in extraction areas and high taxation on fossil fuels, petrol and diesel prices are under constant upward pressure at the pump. This volatility turns fuel expenditure into a difficult item for families and businesses to forecast.
Compared with the uncertainty of oil, the cost per kilometre of electric mobility offers a clear advantage, even when using the public fast charging network:
Combustion vehicle (petrol / diesel): an average petrol car with a real consumption of 6.5 l/100 km, with fuel at a hypothetical average price of €1.75/litre, represents an approximate cost of €11.37 per 100 kilometres. In the case of diesel, 5.5 l/100 km at €1.65/litre, the cost is around €9.07 per 100 km.
Electric vehicle at an EV charging station (fast charging en route): with an average consumption of 18 kWh/100 km and charging at a DC fast charging station at an average tariff of €0.55/kWh, the cost is €9.90 per 100 kilometres.
Electric vehicle (mixed or residential charging): if that same charging is combined with domestic charging during off peak hours, at around €0.12/kWh, the cost falls sharply to around €2.16 per 100 kilometres.
Even in the least favourable scenario for the electric car, charging exclusively at ultra rapid motorway stations, the cost remains competitive compared with petrol. However, when the vehicle’s overall use is assessed, where between 70% and 80% of charging takes place at home or at the workplace and the EV charging station is reserved for long journeys, annual economic savings are between 50% and 70% compared with an internal combustion engine, protecting the user against fluctuations in the price of crude oil.
The strategic role of the EV charging station in the energy transition
The consolidation of the EV charging station as a pillar of transport infrastructure is not simply a future alternative, but an operational necessity today. The deployment of fast and ultra rapid charging stations, supported by smart power management systems and local renewable generation, is key to guaranteeing continuity on long distance journeys and offering a solid economic alternative to the volatility of fossil fuels.
For investors, fleet managers and mobility operators, the success of these projects will depend on rigorous technical planning: from correctly sizing the transformer substation to selecting the most suitable business model to optimise the utilisation rate of the charging posts. In a rapidly expanding market, having an efficient, accessible and high power charging network is the determining factor in accelerating the definitive electrification of the vehicle fleet.
