The longest single variable in a commercial energy infrastructure installation is grid operator notification — typically 3 to 12 weeks, depending on system size. Physical installation usually takes one to three weeks.
Commercial energy infrastructure installations take less time than most property owners expect, and the physical installation phase is the shortest part. The timeline is determined primarily by administrative processes — grid operator notification, equipment procurement, and in some cases planning — not by the physical work on site.
A realistic timeline from initial site assessment to first income: 12 to 20 weeks, depending on property location, grid connection size, and whether wind turbine planning is required.
The site assessment is typically completed in one or two conversations: an initial energy profile review, followed by a specific system proposal. Once the property owner confirms the proposal, detailed system design begins — specifying the battery model and capacity, inverter configuration, generation assets, mounting arrangement, and grid connection documentation.
This phase produces the package of documentation required for grid operator notification and (where applicable) planning application. It runs in the background and does not require any access to the property.
In the UK, any generation or storage asset connecting to the grid must be notified to the distribution network operator (DNO) under the G99 technical standards. DNOs are required to respond within 45 working days (nine calendar weeks) for standard applications. Complex sites — larger storage capacity, proximity to constrained network sections, export-capable systems — may require additional assessment.
In practice, a behind-the-meter BESS installation that does not materially change the property's net grid export profile typically receives G99 approval at the lower end of this range: three to six weeks for straightforward sites. HNordic manages this notification process as part of the programme — the property owner does not interact with the DNO directly.
In Sweden, notification to the regional distribution system operator (DSO — Ellevio, E.ON, or Vattenfall Eldistribution, depending on location) runs on a comparable timeline.
This phase runs in parallel with equipment procurement and does not extend the overall programme timeline where the grid notification and procurement timelines overlap.
Battery systems and inverters are procured from HNordic's established supply partners. Standard battery system delivery timelines from confirmed order are four to eight weeks for most configurations. Wind turbine components have a longer manufacturing lead time — eight to twelve weeks — which determines whether the wind installation extends the overall programme timeline or can be sequenced within the grid notification window.
HNordic's procurement relationships and forward order position reduce lead times below those available to a one-off purchaser.
Physical installation of a battery energy storage system in a commercial property typically takes three to five days for standard configurations: delivery, positioning, electrical connection, inverter installation, and commissioning. For installations in existing plant rooms or external enclosures, the disruption to building operations is minimal.
Wind turbine installation requires roof access — typically one to two days for the mounting structure and a further day for the turbine installation, depending on the turbine model and site access conditions. Solar installation timelines depend on the panel count and roof type.
The physical installation does not require a building shutdown and does not typically disrupt tenant operations beyond the period of roof access (for wind and solar) or plant room access (for battery).
Commissioning involves testing the battery, inverter, and generation connections; configuring the AI energy management system; and completing the grid operator's energisation notification. From commissioning, the system is live: operating cost reduction begins immediately (peak shaving and self-consumption), and grid-services income accrues from the date the battery registers with SVK's or NESO's aggregation framework.
The period between commissioning and first grid-services income payment is typically one billing cycle — the grid-services capacity fee for the first month is paid in arrears.
Battery storage installations in England currently fall within permitted development for most commercial properties — no formal planning permission is required. Wind turbines on commercial buildings currently require full planning permission in England in most cases (the March 2026 permitted development proposal for turbines up to 30m has not yet been enacted as law). A full planning application in England takes eight to thirteen weeks for a standard commercial turbine application; complex sites or contested locations may take longer.
Where planning is required, HNordic manages the application process. The planning timeline typically runs in parallel with equipment procurement and system design, minimising its effect on the overall installation programme. For properties where planning is not required, the 12–20-week target timeline applies without extension.
See also: Does the wind turbine require planning permission? · What does a site assessment actually involve? · Full FAQ