Charging one passenger car and charging a fleet of electric buses are problems one order apart: a bus and truck depot needs total capacity at megawatt level, medium-voltage connection and dedicated electrical infrastructure, while the legal conditions of the charging point have no separate regime — still the ordinary charging station framework plus the technical requirements of large load. This article separates the two faces.
Legal basis
- Facility conditions of an electric bus and truck charging point apply the common framework of charging service business activity: site, construction and fire safety conditions under the Law on Fire Prevention, Fighting and Rescue 55/2024/QH15 and Decree 105/2025/ND-CP, together with pricing and metering rules where charging services are supplied for a fee.
- Rules on power system connection: a customer with a large capacity demand performs a connection agreement with the power utility, investing in a dedicated transformer station and medium-voltage line where capacity exceeds the supply ability of the local low-voltage grid under electrical technical regulations.
- The power operation licensing regime under Decree 61/2025/ND-CP applies where the depot operator sells charging power to third parties outside its own fleet, separated from the model of a depot serving only internally.
How much power does electric bus charging need?
There is no legal capacity norm for a bus charging post — the figure is a technical problem computed from vehicle battery capacity, turnaround time and the number of vehicles charging simultaneously. In market technical ranges, electric buses and trucks use high-power DC fast charging, commonly in the range of hundreds of kW per charging point (many times a passenger car fast charging post), and may use pantograph charging at terminals for short turnaround routes. The total capacity of a depot is computed as charging point power multiplied by a simultaneity factor: a depot of a few dozen vehicles charging overnight on a staggered schedule has total demand in the range of hundreds of kW to a few MW, while a depot fast-charging simultaneously at fleet peak hours can exceed that threshold many times. Two energy governance consequences follow: smart charging schedules spreading load overnight are the most effective measure to reduce registered capacity and power cost; and the capacity registered with the power utility must be computed from the real operating scenario (vehicle count, charging shifts, fleet expansion reserve) because raising connection capacity after the depot operates is a long and costly procedure. When presenting to authorities and the utility, the enterprise should present the load file by scenario instead of one nominal equipment capacity figure.
Does an electric bus depot need a separate charging station permit?
The depot has no separate charging station licence by vehicle type, but its condition set comprises all layers of an electrical infrastructure facility — construction: the depot site and charging station items within the campus must fit the planning and construction permit of the depot project (new depot) or the corresponding renovation and installation procedure (existing depot adding a charging station); fire safety: fire design appraisal and acceptance for the charging area and electric vehicle parking under the rules, noting that large-capacity vehicle battery fire risk and concentrated vehicle density place the depot in the strictly fire-managed facility group; power: a connection agreement and power purchase contract with the power utility for the depot load; and environment and occupational safety in yard operation under common rules. The important legal distinction is the served subject: a depot charging only the fleet of the operating unit itself is internal infrastructure and creates no charging service business activity; a depot opening paid charging for fleets of other units or the public makes that portion a charging service business which must fully satisfy the commercial charging point regime on facility conditions, listed prices, metering and — where constituting power sale — the corresponding power operation conditions. A transport enterprise should determine this model right in the depot project file to avoid adding business conditions after operation begins.
Does high-power fast charging require a dedicated grid?
Yes, at the supply infrastructure level: the large fast-charging load of a depot can rarely be supplied sufficiently from the existing low-voltage grid at the location, so the typical solution is connection to the medium-voltage grid with a dedicated depot transformer station invested by the customer under a connection agreement with the power utility, comprising a medium-voltage cable route, a transformer station with capacity following the registered load, and protection and metering systems at the connection point. The connection agreement is the foundation document of the whole depot power project: it determines the connection point, supplied capacity, investment responsibility for each infrastructure segment and power supply schedule — the enterprise must finalise this agreement before finalising depot design because the transformer station position, cable corridor and electrical rooms decide the site layout. Two accompanying technical requirements the connection file must show are power quality (current harmonics from high-power chargers, power factor) under grid regulations and load dispatch capability — the utility may require a load management system so the depot does not pull peak load beyond commitment at system peak hours. For a large depot, the option of combining a buffer storage battery (BESS) to reduce registered capacity and depot rooftop solar is chosen by many projects, but these items must enter the same connection and fire files from the start instead of being added piecemeal.
Depot charging project recommendations
The correct sequence comprises: modelling load by the five-year fleet operating scenario; working with the power utility on supply capability and the connection agreement before buying land or finalising design; integrating the transformer station, charging area fire safety and expansion reserve into the depot plan once; and determining clearly the internal-versus-commercial boundary of charging activity in the project legal file. Depot charging projects fail on schedule mostly not because of charging equipment but because the electrical infrastructure behind the meter was calculated late.
Frequently asked questions
How much power does electric bus charging need?
There is no legal norm; in market technical ranges, buses and trucks fast-charge DC in the range of hundreds of kW per charging point, and total depot capacity follows charging points times a simultaneity factor — a depot of a few dozen vehicles is usually in the hundreds of kW to a few MW range. Registered capacity must be computed from the real operating scenario; staggered overnight charging is the most effective way to reduce registered capacity.
Does an electric bus depot need a separate charging permit?
There is no separate charging station licence by vehicle type, but the depot must satisfy all condition layers: construction under the depot project, fire appraisal and acceptance of the charging area, a connection agreement and a power purchase contract for the depot load. A depot serving only its internal fleet is internal infrastructure; opening paid charging externally makes that portion a charging service business with the full commercial charging point regime.
Does high-power fast charging require a dedicated grid?
Yes at supply infrastructure level: a large depot load usually requires medium-voltage connection with a dedicated transformer station invested by the customer under a connection agreement with the utility, plus power quality requirements and possibly a load management system avoiding peak pulling at system peak hours. The connection agreement must be finalised before depot design because it decides transformer position and site layout.
This article has been quality-reviewed by the FLAW AI Legal Council