DIRFT is not a town with an industrial fringe. It is a purpose-built rail-freight megasite on the Northamptonshire side of the A5, spread between Crick, Kilsby and Lilbourne where the A5 meets the A428 at junction 18 of the M1 — four miles east of Rugby, six miles north of Daventry. It has been operational since 27 May 1997, growing from DIRFT I through DIRFT II's rail-connected westward expansion into DIRFT III, consented by Development Consent Order in July 2014 on the land east of the A5 that was once the Rugby Radio Station. The roof stock is unusually uniform and unusually large: steel portal frames with long clear spans, shallow-pitched composite cladding, few obstructions and generous incoming supplies, running from roughly 100,000 sq ft up to Tesco's 840,000 sq ft rail-served grocery unit on Danes Way. Rail-served boxes sit hard against the intermodal terminal Malcolm Rail operates on the Northampton Loop of the West Coast Main Line, where the rail link runs in a tunnel under the A5. Older, smaller and far more varied stock is six miles south at Drayton Fields and Mustang Park in Daventry, or five miles west at Central Park, Rugby beside M6 junction 1.
Why warehouse solar makes sense in DIRFT
Every meter at DIRFT sits with National Grid Electricity Distribution, in its East Midlands licence area — distributor ID 11 on the top line of the MPAN. That holds across all three phases, because the warehousing is all on the Northamptonshire side: the A5 running down the western edge towards the Lilbourne crossroads is the Warwickshire boundary, and NGED's separate West Midlands licence (ID 14) only picks up beyond it, at sites like Central Park by M6 junction 1. Same DNO, different queue — worth checking the MPAN before you assume a Rugby quote transfers. G99 gates energisation, not installation, so the practical route on a big DIRFT shed is an export-limited array sized to the building's own load, commissioned while the export question is settled separately. The load profiles help more here than on a general industrial estate: the chilled and frozen grocery boxes at DIRFT II run flat around the clock, the intermodal terminal's handling plant draws hard through the working shift, and the newer automated ambient sheds carry heavy MHE charging load. Northamptonshire sits in the upper middle of the UK yield band — roughly 950-980 kWh/kWp for a well-oriented south-facing commercial array. Most big roofs here take shallow-pitch east/west layouts instead, at about 80-85% of that, which is the number to model from. West Northamptonshire Council is the planning authority for the sheds; on DIRFT III plots the 2014 Development Consent Order's requirements can apply alongside permitted development rights, and the Order's highway works reach across the county line into Rugby Borough.
DIRFT's industrial context — where warehouse solar makes the most sense
The stock splits by phase, and the phase tells you the roof. DIRFT I — DIRFT Central, East and South, operational from 27 May 1997 on the land by the A5 and A428 at M1 junction 18 — is twenty-nine years old, and its earliest composite roofs are into re-clad territory; a re-clad is the cheapest moment there will ever be to add PV fixings and cable routes into a DIRFT shed, so the PV conversation and the cladding conversation should be the same meeting. DIRFT II, the rail-connected westward expansion permitted in 2005 and built out to 2011, is the deep-box core: Tesco's 840,000 sq ft grocery unit on Danes Way completed in September 2011, with chilled and frozen stock around it carrying modern refrigeration plant loads. DIRFT III, consented by Development Consent Order on 3 July 2014, occupies the eastern half of the former Rugby Radio Station land — east of the A5, the western half having gone to Rugby's Houlton urban extension — and is newest and structurally the most accommodating, though those roofs are also the ones most likely to be spoken for by the landlord's own solar plans. Tenure, not engineering, is the real constraint: Prologis is the dominant developer and landlord, big-box occupiers hold ten- to fifteen-year FRI leases, and every scheme runs through a licence for alterations, the roof warranty and the reinstatement clause. Occupiers publicly listed on the park include Tesco, Sainsbury's, M&S, Royal Mail, DHL, GXO, Culina, Halfords, Dunelm, boohoo, Inditex and Kinaxia, with Malcolm Rail running the intermodal terminal since 2008 — grocery and chilled distribution first, then parcels and sortation, contract logistics and container handling. Lighter engineering and trade-counter stock is not on the terminal at all; it is six miles south at Drayton Fields and Mustang Park in Daventry.
Major industrial estates we cover
- Prologis RFI DIRFT I (the original 1997 phase — DIRFT Central, East and South — by the A5 and A428 at M1 junction 18)
- DIRFT II (the rail-connected westward expansion permitted in 2005; Tesco's 840,000 sq ft grocery unit on Danes Way, NN6 7FT)
- DIRFT III (east of the A5 towards Lilbourne, on the former Rugby Radio Station land, consented by Development Consent Order in July 2014)
- DIRFT intermodal rail terminal (operated by Malcolm Rail, connected to the Northampton Loop of the West Coast Main Line)
- Central Park, Rugby (Castle Mound Way and Central Park Drive, CV23 0, beside M6 junction 1 — about five miles west)
- Magna Park, Lutterworth (GLP's park north up the A5 near the A4303 junction, LE17 4)
- Drayton Fields Industrial Estate, Daventry (older mixed industrial and trade stock, NN11 8, six miles south)
Commercial solar installers in DIRFT
Warehouse roofs are the whole of our business, and in the East Midlands that specialism earns its keep. DIRFT sits inside the distribution Golden Triangle formed by the M1, M6 and M69, so the buildings we survey here are rarely modest: big sheds of the Magna Park, DIRFT and SEGRO Logistics Park East Midlands Gateway type, and the older 1980s and 90s trade estates that fill the gaps between them — Markham Vale, Bardon, Earlstrees, Teal Park and their local equivalents around DIRFT.
Three distribution network operators touch this region, and which one you fall under changes the programme more than the roof does. National Grid Electricity Distribution covers the bulk of it; Northern Powergrid takes northern Lincolnshire — Scunthorpe, Grimsby and the Immingham corridor — and the Bassetlaw fringe of north Nottinghamshire around Worksop and Retford; and Electricity North West picks up the High Peak around Glossop and Buxton. We confirm which licence area DIRFT answers to before quoting, because the application route, the timescales and the appetite for a flexible or export-limited connection differ between them.
At this scale the survey starts with the deck, not the panel: purlin spacing and capacity, cladding age on twin-skin composite, rooflight percentage, and whether the occupier's lease requires landlord and insurer consent. Then we size to the site's own load profile, never to the available roof area.
Commercial solar contractors versus residential solar installers — which do you need in DIRFT?
The gap is not skill, it is the regime the work sits under. A house array is a G98 connection — up to 16A per phase, notified after the fact. Nothing on an East Midlands distribution shed is that. A 400 kW roof on a Golden Triangle unit is a G99 application with a full connection study, lodged with NGED, Northern Powergrid or Electricity North West depending on where DIRFT sits, and assessed against whatever headroom the local primary still holds. Headroom here has generally been easier to come by than in the South East, though that is tightening around the airport corridor and the newer logistics parks — check the current network heat map for DIRFT rather than assuming.
The rest compounds from there. MCS is the domestic route and only mandatory to 50 kW; above that, SEG eligibility runs through Ofgem's equivalent-certification route, and the paperwork a 400 kW roof needs looks nothing like a domestic MCS certificate. Allowances need structuring before commitment, because solar is special-rate plant: 100% AIA up to the £1m cap, the 50% first-year allowance on the balance for companies, and never main-rate full expensing. And on a leased logistics unit you need an insurer-backed workmanship warranty, landlord consent and a roof warranty that survives penetration or ballast.
Commercial solar panel cost in DIRFT — system size, payback, financing
East Midlands irradiance is middling and honest — plan on roughly 950 to 1,000 kWh per installed kWp a year for a south-facing pitched array, and roughly 80 to 85% of that, about 780 to 860, for the east-west ballasted layouts common on flat-roofed cross-dock units. Less than the south coast, but on roofs several times the size, so the absolute yield around DIRFT is large.
Indicative capital cost runs about £600 to £800 per kWp at 100 to 250 kWp, falling toward £500 to £650 per kWp above 500 kWp where the roof is uncomplicated and the intake is close by. Payback tracks the load profile, not the postcode: a chilled RDC or an automated pick face with a heavy daytime base load typically lands in four to six years; an ambient storage shed with two forklifts and a lit office can sit at eight or more.
Export is the weak leg. Large suppliers must offer a SEG tariff but set their own rate — the best-known domestic benchmark, Octopus Outgoing Fixed, has been 12p since 1 March 2026 (as at August 2026), and the 29 to 32p headlines are domestic battery products with no warehouse equivalent. Self-consumption is where the return lives. Where the lease is shorter than the payback, a landlord-funded scheme or a roof-lease PPA usually beats capex.
Solar battery storage for DIRFT warehouses
This region has a distinctive mismatch. East Midlands Airport handles more freight than any UK airport except Heathrow, and is the country's largest dedicated air-cargo hub; the overnight parcel hubs and the 3PL operations feeding them around DIRFT run hardest between roughly 22:00 and 04:00 — precisely when the array makes nothing. Add the chilled and frozen RDCs that never stop, and you get sites where daytime generation overshoots and the real demand sits in the dark. That is the clearest case for storage anywhere in the East Midlands: time-shift the midday surplus into the night shift rather than exporting it into a wholesale-linked PPA at a fraction of your import price.
Two more local drivers. Weekday DUoS red-band charges hit late afternoon, when a warehouse array is already fading — a battery covers that window. And final-mile van fleets are electrifying fast across the Golden Triangle; storage can absorb the added kVA and defer an expensive supply upgrade. Where a connection offer caps export, a battery lets you keep generating instead of curtailing.
It does not suit everything. A single-shift ambient shed near DIRFT with a modest base load rarely justifies it yet.
A real DIRFT install scenario
A modelled DIRFT II scenario: a 500,000 sq ft rail-served chilled and ambient unit puts 1,000 kWp on the shallow east/west pitch — a structural survey, not the roof area, usually sets that ceiling on a composite deck of this age. At 800 kWh/kWp for east/west here, about 83% of the 950-980 kWh/kWp south-facing band for Northamptonshire, that is 800,000 kWh a year. With refrigeration running round the clock, roughly 75% is used on site: 600,000 kWh displaced at 22p/kWh is £132,000, and the 200,000 kWh exported at Octopus Outgoing Fixed's 12p (as at August 2026) adds £24,000 — about £156,000 a year. At £650/kWp the array costs £650,000, so simple payback is a little over four years before tax. Solar is special-rate plant: the whole £650,000 sits inside the £1m Annual Investment Allowance, giving 100% relief in year one. These figures are modelled, not measured; a half-hourly pull from that unit's own meter, and a structural report on the deck, would move them.
Postcodes covered across DIRFT
We deliver commercial warehouse solar installations across all major DIRFT postcode districts:
- NN6 7 (Prologis RFI DIRFT — Danes Way and the DIRFT I, II and III units, e.g. NN6 7FT and NN6 7GZ)
- CV23 8 (Kilsby, just south of the A5-A428 junction)
- CV23 0 (Lilbourne and Clifton upon Dunsmore; also Central Park, Rugby at CV23 0WA-0WE)
- NN11 8 (Drayton Fields and Mustang Park, Daventry)
- LE17 4 (Magna Park, Lutterworth)
Adjoining commercial areas
DIRFT's warehouse market doesn't stop at the boundary. We also deliver warehouse solar PV in adjoining areas:
Crick · Kilsby · Lilbourne · Yelvertoft · Barby · Daventry · Rugby
Frequently asked questions about DIRFT warehouse solar
Which network operator handles a G99 application at DIRFT, and does the county boundary change anything?
National Grid Electricity Distribution, East Midlands licence area — distributor ID 11 on the top line of your MPAN. That holds for all three phases, because the warehousing is all on the Northamptonshire side of the A5: DIRFT I by the A428, DIRFT II on Danes Way, and the DIRFT III land east of the A5 towards Lilbourne. The A5 running down the western edge of the estate is the Warwickshire boundary, and NGED's separate West Midlands licence (ID 14) only picks up beyond it — so a quote from a Rugby site such as Central Park by M6 junction 1 is the same DNO but a different connection queue, and the timescales do not transfer. G99 approval gates energisation rather than installation, so most DIRFT projects are built as export-limited arrays matched to the shed's own load — which on a chilled box here is a high number. Storage cannot chase Triads: those were abolished in April 2023 under the Targeted Charging Review. It can still cut DUoS red-band charges and Capacity Market levy exposure, which matters on a terminal that handles trains through the evening peak.
What can a DIRFT warehouse realistically earn from exported solar?
Less than a 500,000 sq ft roof might suggest. Large licensed suppliers must offer a Smart Export Guarantee tariff, but each sets its own rate — Octopus Outgoing Fixed has paid 12p since 1 March 2026 (as at August 2026), and the 29-32p figures circulating are domestic battery tariffs with no warehouse-scale equivalent. MCS certification is mandatory for SEG only up to 50 kW; anything worth putting on a DIRFT distribution roof is far bigger than that, so Ofgem accepts equivalent evidence instead. DIRFT also sits outside the East Midlands Freeport tax sites, so there is no Enhanced Capital Allowance route here — and in any case ECA is an alternative first-year relief to the Annual Investment Allowance, never an addition to it. The money on this estate is in self-consumption: the chilled and frozen grocery boxes at DIRFT II draw round the clock, so a correctly sized array is displacing import at 20p-plus rather than exporting at 12p.
We lease a unit at Prologis RFI DIRFT — can we put solar on a roof we don't own?
Usually yes, but at DIRFT the paperwork leads the engineering, because almost nobody here owns their box: Prologis is the dominant landlord alongside institutional owners, and the DIRFT III land is a Prologis joint venture with the former Rugby Radio Station partnership. You need a licence for alterations, the roof warranty checked against its approved-installer list, and a written position on reinstatement at lease end — that last one bites hardest on DIRFT I stock, now twenty-nine years old and close enough to a re-clad that the landlord may want the roof plan settled first. The split incentive is sharp on a ten- to fifteen-year FRI box: the tenant banks the electricity saving, the landlord banks the EPC uplift and the residual value. EPC E remains the letting floor, the 2027 EPC C step was dropped in June 2026, and EPC B around 2031 is a proposal rather than law. Whoever incurs the cost claims the allowances: solar is special-rate plant, so a company covers it with the £1m Annual Investment Allowance and takes the 50% first-year allowance on anything above.