Reports needed for a ground mounted solar farm

The reports for a solar farm application divide into three groups: the land quality case, the landscape and visual case, and the technical assessments that answer specific consultees. Get the first two wrong and no amount of technical work saves the application, because refusals on ground mounted solar overwhelmingly cite loss of best and most versatile agricultural land, landscape harm, or both.

Everything else follows the constraints your particular field carries. A 20 hectare site on grade 4 land behind a mature hedge network needs a very different pack from 20 hectares of grade 2 arable in open countryside beside a listed farmstead.

Establishing the agricultural land classification

Start here, before you spend money on anything else. National policy expects poorer quality land to be used in preference to the best and most versatile, which means grades 1, 2 and 3a. The published regional maps are far too coarse to answer the question for a single field, and grade 3 on a published map splits into 3a and 3b only on survey.

A site specific Agricultural Land Classification survey is therefore near enough unavoidable on arable land. A soil scientist augers the site on a grid, assesses soil texture, depth, stoniness, wetness and gradient against the published classification guidelines, and produces a plan showing the grade of each parcel. Field work cannot sensibly be done when the ground is waterlogged, so programme it.

The result shapes the application rather than merely reporting on it. Where parts of the site come back as 3a, the sensible response is often to redraw the red line and take those parcels out. Where the whole site is 3a or better, the case has to be made on the sequential approach to site selection: what alternatives were considered, why they were rejected, and what the site specific benefits are.

Say plainly that the use is temporary and reversible, that soils remain in situ, that sheep grazing or grassland management can continue between and beneath the panels, and that the land returns to agriculture on decommissioning. Those are the arguments that carry weight, and they need evidence rather than assertion.

Landscape and visual assessment

A Landscape and Visual Impact Assessment following the third edition of the landscape and visual assessment guidelines is the core document on any scheme of scale. It should establish the landscape character context from published character assessments, identify receptors, agree a viewpoint schedule with the council before the fieldwork, and report effects separately on landscape character and on visual amenity.

Photomontages from agreed viewpoints matter more here than in most sectors, because panels are low and their visibility depends heavily on intervening hedgerows and topography. Assess the winter case. A scheme screened by a hedge in August is a different proposition in February, and an inspector will ask.

Cumulative effects are the other half. Where consented or operational schemes sit within the same visual envelope, assess them together. Councils increasingly refuse on cumulative landscape change even where an individual scheme reads as acceptable.

Mitigation is mostly planting and time. Set out the proposed hedgerow reinforcement, new hedges, hedgerow trees and field margins, state the establishment period honestly, and secure it through a landscape and ecological management plan.

Glint and glare

Glint and glare is the assessment people forget until a consultee asks. Modern modules are designed to absorb light, but reflection still occurs, and the question is whether it reaches a receptor at an angle and duration that matters.

Three receptor groups drive the work. Aviation comes first: if the site lies within the safeguarding zone of a licensed aerodrome, a military site or a helipad, the aerodrome operator and the relevant safeguarding authority will want a geometric assessment of reflections towards the approach paths and the control tower. Road and rail come second, with an assessment of reflections towards driver and signaller sightlines. Dwellings come third, assessed against habitable room windows.

The output is a set of modelled reflection periods by receptor, with mitigation where a period is material: anti reflective coatings, panel tilt or orientation changes, screen planting, or removing a row. Commission it early enough that a layout change is still possible.

Ecology, biodiversity and the land under the panels

Solar farms are one of the few development types that can deliver biodiversity gain easily, because arable land scores poorly at baseline and species rich grassland under panels scores well. That does not make the ecology work optional.

Expect a preliminary ecological appraisal with an extended habitat survey, protected species surveys where the appraisal identifies potential, and a Biodiversity Net Gain Assessment using the statutory metric. Under the Environment Act 2021 the metric must be completed by a competent person and the biodiversity gain plan approved by the local planning authority, so an AI draft is a starting point for that professional rather than a substitute for them.

Protected species surveys are seasonal and they will set your programme. Breeding birds run March to August, reptiles April to October with the best results in spring and early autumn, and bat activity work runs through the summer. Great crested newt survey windows are tighter still. A scheme that commissions ecology in October has lost a year.

Design the grassland regime properly, because it is both the biodiversity offer and the agricultural continuity argument. Seed mix, cutting or grazing regime, margins, and the management body all belong in a management plan secured by condition.

Access, construction traffic and cable routes

Construction traffic is short, intense and heavy on rural lanes. A construction traffic management plan should set out the routes, the vehicle types, daily movement numbers by phase, passing places, wheel washing, abnormal load routing for transformers, and the condition survey of the highway before and after.

Permanent traffic is negligible, which is worth stating plainly, because highway authorities occasionally apply commercial trip rates by default.

The cable route to the point of connection is the part that most often sits outside the red line and gets forgotten. Work out early whether the connection is underground within the applicant's land, whether it crosses third party land, and whether any overhead line element requires separate consent under the Electricity Act 1989. Trenching through a hedgerow, a watercourse or an area of archaeological interest brings its own consents and surveys.

Archaeology deserves the same early attention. Large scale, shallow ground disturbance across open fields is exactly the pattern that county archaeologists want tested, and a desk based assessment followed by geophysical survey is the normal sequence.

Decommissioning and restoration

Permissions for ground mounted solar are usually granted for a fixed period, commonly around forty years, with a condition requiring removal and restoration at the end of it. The decommissioning method statement should cover removal of panels, frames, cabling, transformers and access tracks, the treatment of pile foundations, soil handling, reseeding, and the timescale for completion.

Some authorities also want financial security, whether by bond or by a section 106 obligation. Ask at pre-application what the authority's practice is, because it affects the appraisal.

Soil protection during construction matters to the restoration case. A soil resources and management plan setting out stripping, storage and reinstatement demonstrates that the reversibility argument is real. Without it, the claim that the land returns to grade 2 arable is just a claim.

When the scheme stops being a local application

Above a capacity threshold set by the Planning Act 2008, a solar generating station in England is a nationally significant infrastructure project, consented by development consent order through the Planning Inspectorate rather than by the local planning authority. The threshold for onshore solar was changed by the Energy Act 2023, so check the figure currently in force before assuming which route applies, and take advice where the scheme sits anywhere near it.

Environmental impact assessment is a separate question. Ground mounted solar falls within the descriptions in Schedule 2 to the Environmental Impact Assessment Regulations 2017, so a screening request is the usual first step. Where the scheme is screened in, the environmental statement must be prepared by competent experts as those Regulations require.

For smaller schemes the picture is simpler, and a rooftop or car park array raises a different set of questions altogether, as set out in our note on solar canopies over a car park.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. Enter your postcode on PlanScope to see which of the 66 report types a ground mounted scheme on your land is likely to need. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.