Scenario: a factory finishes its structural works and only then starts on power — discovering that the slowest part is not the utility but its own substation, which has not even been designed. Three-phase supply for production is a miniature infrastructure project running parallel to the construction project: whoever plans it late, commissions late. This article maps the sequence, the cost boundary and the practical bottlenecks.
Legal framework and the standard sequence
Electricity activities are now governed by the Law on Electricity 61/2024/QH15 (replacing the 2004 Electricity Law), with Ministry of Industry and Trade detail on connection, metering and power purchase contracts. Supplying a production customer runs in four stages. Stage one, demand registration: the enterprise files a power-supply request with its legal documents (investment registration certificate, enterprise registration, master layout, maximum demand calculation and projected load curve). Stage two, survey and connection agreement: the power company determines the connection point, the supply voltage (medium voltage for factory loads), technical requirements and the investment boundary between utility and customer, recorded in a written connection agreement. Stage three, the customer’s own investment: the internal substation and network behind the connection point, designed and built by organisations licensed for power design consultancy and electrical construction. Stage four, acceptance and energisation: the utility inspects and accepts the customer’s electrical works, installs metering, signs the power purchase agreement, and only then energises the supply.
Who pays for what
The financial boundary is fixed in the connection agreement on this principle: the power sector invests its grid up to the connection point; the customer invests everything serving itself alone — substation, switchgear, internal cabling. For a large-load plant, the substation investment and equipment procurement lead time (transformers, medium-voltage switchboards) dominate both schedule and budget, and they sit entirely on the enterprise’s side. Two items routinely missed in budgeting: compensation and site-clearance support for any off-fence cable route, and design appraisal plus electrical safety inspection fees for the electrical works. Both should be clarified at the connection-agreement stage, not mid-construction.
Common bottlenecks and how to avoid them
One, unrealistic demand registration: registering below true demand to save upfront cost leads to overload and a capacity-upgrade process that restarts the connection sequence; registering far above wastes fixed charges. Two, substation designs that ignore the local utility’s standards and bounce through review rounds — pick a designer that has worked with that specific power company. Three, treating power as a fit-out-stage task: the correct sequence registers demand in parallel with factory design, so the connection agreement is settled before transformers are ordered. Four, for park tenants: the land sub-lease must state whether power comes directly from the utility or through the park developer, the minimum committed capacity and compensation mechanics for shortfalls — production power disputes cannot be solved by waiting.
Frequently Asked Questions
What is the procedure to get three-phase power for a production factory?
The standard sequence with the local power company: (1) file a power-supply request stating maximum demand, with the investment registration certificate and enterprise registration; (2) the utility surveys and issues a connection agreement fixing the connection point, voltage level and the investment boundary; (3) the customer designs and builds everything behind the connection point (its internal substation) through firms licensed for power design consultancy and construction; (4) acceptance testing, signing the power purchase agreement, then energisation. The Law on Electricity 61/2024/QH15 is the current framework; procedural detail follows Ministry of Industry and Trade rules and the power corporations’ published processes.
Who pays for the substation investment?
The boundary follows the connection point: the utility invests the grid up to the connection point under planning and connection-cost rules; the customer invests its own substation and internal network behind that point because those assets serve the factory alone. In practice, a large-load factory inside an industrial park almost always funds its own substation and either hands over operation or self-operates through a licensed unit. Every investment-boundary term must be locked in the written connection agreement before the substation is designed — this is the cost item most often blown because it surfaces late.
How long does power supply for a new factory take?
The critical path is usually the customer’s own substation and internal electrical works (measured in months), while the utility’s administrative steps (survey, connection agreement, acceptance, contract) follow standardised published processes of the power corporations. Delay risks concentrate in: registered maximum demand that mismatches the area’s supply planning; substation designs redone for failing the utility’s technical standards; and off-fence line sections needing construction permits and site-clearance compensation. Filing the demand registration as soon as the master layout exists is the single best way to compress the total timeline.
If the power utility refuses or delays supply, where can the factory complain?
Follow a three-step ladder, always in writing. Step one: work with the local power unit and the distribution company — demand a written answer stating the reason for refusal or delay (grid overload, no planned source), because a written technical reason is the basis for every next step. Step two: complain or petition to the provincial Department of Industry and Trade, the local state authority for electricity. Step three: escalate to the Ministry of Industry and Trade (Electricity Regulatory Authority) where the issue is systemic. In parallel, for an in-park factory the fastest practical channel is through the park developer — the party named on the park’s master connection agreement — and the park Management Board, because supply at the plot boundary usually sits inside the developer’s own commitments with the utility.
This article has been quality-reviewed by the FLAW AI Legal Council
