Portfolio rollout economics — the 15-25% advantage over single-site
A 10-site portfolio rollout delivers better economics than 10 sequential individual site installations: (1) Design standardisation: PVSyst template adapted per site — design time drops from 40-60 hours to 10-15 hours per site after the first. (2) Hardware: 10-site volume order (5-30 MW) attracts panel and inverter pricing 8-15% below single-site spot. (3) DNO pre-negotiation: multi-site portfolios in a single DNO territory (all WPD or all Northern Powergrid) attract pre-negotiated connection templates — reducing G99 legal and technical cost 15-20% per site. (4) Finance: single facility for 10 sites attracts lower interest rate (2-4% lower), longer amortisation (15-20 years), lower arrangement fee per MW versus 10 individual financings. (5) Monitoring: single multi-site platform (Powwow, Ampere Energy) versus 10 separate setups saves £500-£2,000/site/year in licensing.
Single PPA vs asset finance for portfolio rollouts
Finance choice for multi-site portfolios: PPA (Power Purchase Agreement): SPV owns all sites; you pay per kWh below grid retail; zero capex; off-balance-sheet; suitable for tenants on 5-15 year leases; PPA tariff fixed 15-25 years. Asset finance facility: you own all sites as a single portfolio asset; lower all-in cost (AIA + tax shield reduces effective cost 25-40%); on-balance-sheet (relevant for REIT reporting). Hybrid: asset finance for longer-lease or owner-occupied sites; PPA for shorter-lease or tenant sites. Major finance providers 2026: NatWest Green Finance, Gresham House, Temporis Capital (asset finance); Grid Capital, Bluefield, RecyGen (PPA). Minimum for single facility: typically £500k-£1m total portfolio capex (3-5 sites at 100-200 kW each).
Simultaneous G99 submissions across multiple DNOs
For a 50-site national portfolio across 4-6 DNO territories: submit all sites simultaneously on day 1 of programme commitment. Each G99 application takes 65-90 working days for feasibility regardless of start date — sequential submission wastes 6-12 months on total programme timeline. Pre-negotiate DNO templates: WPD multi-site connection agreement (West Midlands, South West, Wales, East Midlands — WPD has a standard multi-site framework). UKPN (London, South East, East): similar. For portfolios above 10 sites: request formal DNO pre-submission coordination meeting — most DNOs accommodate this for volume customers. Critical path: Scottish sites (SP Networks 8-12 months) and South East rural (SSEN 6-14 months) — start these first.
Consolidated retailer audit pack — one pack for all sites
The major commercial advantage of portfolio rollout is a single consolidated audit pack. Monthly PDF: total portfolio generation (kWh); per-site generation table; per-site self-consumption; per-site avoided carbon; portfolio-level Scope 2 reduction. Retailer formats: Amazon Climate Pledge — portfolio generation report with per-site MCS reference numbers; DHL GoGreen Plus — portfolio Scope 2 reduction certificate; ASOS Fashion with Integrity — annual sustainability submission; John Lewis — supplier scorecard integration. Single portfolio pack versus 10 individual site reports: reduces sustainability team reporting burden 80%.
Common questions
What is the minimum portfolio size for a single asset finance facility?
Most asset finance providers require £500k-£1m minimum total portfolio capex for a single facility — approximately 3-5 sites at 100-200 kW each, or 2-3 sites at 300-500 kW. Above £5m total portfolio: premium terms available (sub-5% interest, 20-year amortisation, lower arrangement fees).
Can we manage G99 submissions across 50 sites simultaneously?
Yes — we have delivered 6-12 site portfolio rollouts across multiple DNOs simultaneously. For a 50-site national portfolio across 4-6 DNO territories: we manage parallel G99 submissions to all DNOs using standardised data packages adapted per DNO format. Critical constraint: SP Networks (Scotland) at 8-12 months and SSEN (6-14 months) — start Scottish and rural South East sites first to reduce total programme critical path.