Solar farms, wind farms, hydro and geothermal - power assets built to industrial standards.

The eighteen guides in this sector open with the shared enabling works every scheme needs - site access, survey, ground investigation and the resource and grid studies the asset is financed on - then branch into utility-scale solar, onshore and offshore wind, hydroelectric schemes and geothermal, and close with energisation and handover. Oil & gas facility guides now sit in their own sector under Industrial & Specialist Facilities.

A generation asset is not sold on its finish; it is financed on a yield calculation, and that calculation pins down everything on site. The wind resource assessment or the solar irradiation study fixes the layout before the first digger arrives, the lender's engineer checks the construction programme against the revenue model, and the grid connection agreement fixes the date by which the asset must export. Miss the energisation window in the connection agreement and you are not just late - you are in breach of a contract that underpins the project finance. On UK schemes the connection offer from the DNO or National Grid carries a queue position and a works programme of its own; in the UAE, DEWA or the emirate utility specifies the interface point, the protection settings and the metering, and the developer builds to that specification.

Procurement reflects this. The balance-of-plant civils - access tracks, foundations, drainage, cable trenches - are let as ordinary construction packages, but the turbines, modules, inverters and main transformers are supply contracts with liquidated damages and shipping windows that drive the site programme rather than the other way round. A two-month delay on transformer delivery does not just shift the electrical works; it pushes energisation past the contracted date and costs real money. Site teams learn early that the critical path on a generation scheme usually runs through a factory in another country, not through the concrete gang.

The regulatory wrapper differs in kind between the two markets. UK schemes carry planning conditions that read like a second specification: construction hours, delivery routes agreed with the highway authority, ecological clerk-of-works supervision in sensitive seasons, and noise limits that decide when piling rigs and rock breakers may run. UAE schemes answer to the utility and the municipality on the technical file and to Civil Defence where fuel or battery storage is involved, but the consenting is consolidated and fast by comparison. In both markets the lender's independent engineer walks the site monthly, and drawdowns follow certified progress - the paperwork is part of the critical path.

Generation construction is repetitive civils at scale followed by a short, intense commissioning phase. A 50 MW solar farm is thousands of driven piles, hundreds of module tables and kilometres of DC string cabling laid in trenches - the same detail done correctly four thousand times. Onshore wind is the same pattern with bigger units: each turbine is a foundation pour of 400 to 600 cubic metres held to tight flatness tolerances for the tower flange, a hardstanding sized for the main erection crane, and a lift sequence that only happens when the wind drops below the crane's operating limit. Weather is not a nuisance on these programmes; it is a programmed constraint with its own downtime allowances.

Energisation is staged, not a single event. Strings or turbine groups are tested and connected in blocks so the asset starts exporting before the last foundation is poured. Each stage needs its own protection settings witnessed, its own safety documentation and its own handover pack. The back end of the programme is dominated by witnessed tests - protection trip tests, SCADA point-to-point checks, capacity and performance ratio tests - because the owner's revenue starts only when the operator accepts the asset. Practical completion and taking-over are tied to demonstrated output, not to the civils being finished.

Offshore wind deserves its own mention because it inverts the usual risk profile: the onshore substation and cable landfall are ordinary work, whilst the offshore campaign is a marine logistics exercise priced by the vessel-day. Foundations, array cables and turbines are installed from jack-ups and heavy-lift vessels in weather windows booked months ahead, and a missed window is measured in weeks of vessel standby, not days of programme float. The contractor's skill is in the interface - getting every component fabricated, marshalled at the port and loaded out in exactly the sequence the installation vessel needs it.

Before any generation kit arrives, the site has to be made reachable. Wind farms in upland Britain start with kilometres of stone access track built to carry abnormal loads - nacelles and blades that weigh tens of tonnes and cannot take a tight bend or a weak verge - plus crane hardstandings at every position and passing places along the route. Solar schemes are gentler but no less programmed: the site is cleared, levelled where the tracker or fixed-tilt geometry demands it, fenced and drained before the first pile goes in. Hydro schemes add the hardest enabling works of all - cofferdams, diversion tunnels or flumes, and dewatering that runs for the whole job - because the river has prior claim on the ground you are building in.

Ground investigation carries unusual weight in this sector because the loads are unusual: turbine foundations cycle millions of times over the design life, so dynamic soil properties matter alongside the ordinary bearing checks, and solar pile refusal in rock or pull-out failure in soft ground can force a redesign of whole rows. The geotechnical report is read by the foundation designer, the piling subcontractor and the lender's engineer, and each is looking for something different.

The expensive failures on generation schemes are rarely dramatic. Cable damage during trench backfill - a stone through the insulation that passes testing and fails two years later - means digging up a live array to find a fault measured in metres of cable among kilometres. Foundation bolt-group or flange errors on wind bases cannot be shimmed away; a tower base out of tolerance holds the whole erection sequence. Inverter station earthing that fails grid compliance testing stops energisation regardless of how finished the site looks. And on solar schemes, under-specified cable derating for ground temperature shows up only as chronic underperformance, which is a warranty dispute, not a defect you can snag.

Hydrology is the other quiet killer. Access tracks and platform drainage that redirect surface water across neighbours' land, or culverts undersized for the design storm, generate claims and enforcement long after the plant has left. Schemes in the UK answer to the Environment Agency and planning conditions on runoff; in the UAE the issue inverts - flash-flood wadi flows across what looked like dry ground, and saline groundwater attacking buried steel and concrete unless coatings, cathodic protection and sulphate-resisting mixes were specified from the start.

In the UK the dominant constraints are planning, ecology and grid queue position. Construction hours, turbine delivery routes through villages, ornithological exclusion windows and peat or habitat reinstatement conditions all sit on the programme, and the connection date in the queue can slip years before a spade touches the ground. Summer working is generous and ground conditions, whilst wet, are at least predictable.

In the UAE the grid interface is simpler - one utility, one specification - but the climate rewrites the method statements. Concrete for foundations needs temperature control through summer: chilled mix water or ice, night pours, and curing regimes that would be over-engineering in Britain. Module and cable ratings are derated for ambient temperatures that exceed 45 degrees, which changes string design and trench spacing. Dust accumulation on panels is an operating cost designed for at construction with access for cleaning, and the shallow saline water table on coastal plots dictates galvanised or coated buried steelwork as standard. The programme also bends around summer midday working restrictions, which compresses outdoor work into mornings, evenings and night shifts for four months of the year.