Feedstock System Analysis
Manufacturing Feedstock Opportunity Study · Prepared by Carbotura, Inc. · Confidential
§0 — What This Means
Edinburgh City Council met the Scottish Government's statutory 70% recycling target in 2024–25 — the first year the target applied at this level — reducing residual kerbside feedstock by 25% since 2022/23. The remaining ~780 TPD of non-recycled material flows predominantly to FCC Environment (UK)'s Millerhill Recycling & Energy Recovery Centre (MRERC) under the Millerhill EfW contract regional partnership. That contract runs to approximately 2040–41, with a five-year extension option.
The contract structure is the primary access constraint on Edinburgh's manufacturing feedstock system. Approximately 145 TPD of residual kerbside and HWRC feedstock is contractually committed to Millerhill Recycling & Energy Recovery Centre (MRERC). Non-contracted streams — food waste, garden waste, commercial residual, biosolids, and C&D material — total an estimated 48–69 TPD and are accessible without contract renegotiation.
Edinburgh's manufacturing feedstock cost baseline is structurally exposed. UK landfill tax reached £126.15 per tonne in April 2025. Edinburgh's ERF disposal cost is undisclosed under Millerhill EfW contract commercial terms, but comparable West Central Scotland municipal EfW gate fees are estimated at £95–115 per tonne. These costs escalate under both mechanisms.
Edinburgh is the fastest-growing local authority in Scotland by population rate (+1.7% in 2023–24). Feedstock volumes are likely to grow with population even as per-household intensity declines. Post-2040 feedstock planning is an open question with no disclosed successor strategy.
Scottish Water operates five wastewater treatment works within Edinburgh's boundary, generating an estimated 2,500 tpy of biosolids currently managed under land application — a stream under increasing regulatory and agronomic pressure as nutrient limits tighten.
§1 — Feedstock Profile
ACM is confirmed capable of processing every material stream Edinburgh City Council generates. Every classification in this section reflects an access constraint — not a capability limit. The barrier to any stream is contractual, logistical, or regulatory — never technical.
§1.1 — Material Stream Inventory
| Stream | Volume (tpy) | TPD | Source | Access Classification | Notes |
|---|---|---|---|---|---|
| Kerbside residual household | 14,832 | 40.6 | VERIFIED | CONDITIONAL | Committed to Millerhill EfW contract / Millerhill Recycling & Energy Recovery Centre (MRERC) ~2040–41 |
| HWRC residual | ~7,500 | ~20.5 | ESTIMATED | CONDITIONAL | 1 HWRC at Seafield; flows to Millerhill Recycling & Energy Recovery Centre (MRERC) operated by FCC Environment |
| Commercial / trade residual | ~8,000 | ~21.9 | ESTIMATED | CONDITIONAL | New mandatory source-separation rules April 2024; residual fraction post-separation |
| Food waste (captured kerbside) | ~5,500 | ~15.1 | ESTIMATED | IMMEDIATE | Weekly collection via Wastesavers; not ERF-committed |
| Garden waste | ~7,000 | ~19.2 | ESTIMATED | IMMEDIATE | Three-weekly, March–November seasonal; not ERF-committed |
| Biosolids (Scottish Water) | ~2,500 | ~6.8 | ESTIMATED | ACCESSIBLE | 5 Edinburgh WWTPs; land application via Biosolids Assurance Scheme |
| C&D residual / specialist | ~2,000 | ~5.5 | ESTIMATED | ACCESSIBLE | Edinburgh City Council landfill; includes asbestos-category specialist streams |
| Total Addressable | ~47,332 | ~129.7 | All streams confirmed within ACM capability |
IMMEDIATE = available without third-party contract renegotiation. CONDITIONAL = requires contract transition or supplementary agreement. ACCESSIBLE = requires service agreement with stream operator. No classification implies an ACM capability limitation.
§1.2 — Residual Stream Composition
Based on Edinburgh City Council's 2022 waste composition analysis of non-recyclable bins, over 24% of residual bin contents comprised food matter and 14% comprised dry recyclables — both misclassified. Following the three-weekly collection changes and Wastesavers kerbside enhancements in 2023–24, WRAP data confirms a 30% reduction in dry recyclables in the residual bin and a 17% reduction in food matter. The remaining residual is therefore skewed further toward true non-recyclable material — a higher-quality manufacturing feedstock composition.
§1.3 — Seasonal and Structural Variation
Garden waste is seasonal (March–November). Three-weekly collection means peak-season volumes significantly exceed annual averages. Edinburgh's population growth (+1.7% per year, highest in Scotland) will generate upward feedstock pressure against declining per-household intensity. Scottish Government 'Beyond Recycling' targets may tighten further post-2025, potentially reducing accessible residual volumes in the medium term. April 2024 mandatory commercial source-separation rules create new structured commercial feedstock as the separation regime matures.
§2 — Regulatory Baseline
§2.1 — Scottish Government Statutory Framework
| Requirement | Threshold | Edinburgh Status (2024–25) |
|---|---|---|
| Recycling Rate Target | 70% by 2024–25 ('Beyond Recycling' 2021) | ✓ MET — Edinburgh confirmed in 12 of 22 Scottish authorities meeting the target |
| Landfill Diversion Duty | Progressive annual BMW limits (Landfill Allowances Scheme) | ✓ Met — Edinburgh landfill is contingency/specialist only |
| Mandatory Workplace Separation | All businesses, charities, public sector from April 2024 | Active — Edinburgh City Council commercial guidance in force |
| Food Waste Sewer Ban | April 2024, Scotland | Active |
§2.2 — UK Landfill Tax Trajectory
| Year | Standard Rate (£/tonne) | Change |
|---|---|---|
| 2023–24 | £102.10 | |
| 2024–25 | £102.70 | +1.6% |
| 2025–26 | £126.15 | +21.6% (single year) |
The 21.6% single-year increase materially increases the cost of any fallback to landfill disposal. Edinburgh's own landfill operation is now structurally expensive as a primary disposal route. Its role as a contingency and specialist facility (asbestos-category streams) is the rational configuration given this tax structure.
§2.3 — Scottish Water Regulatory Pressure on Biosolids
Scottish Water's biosolids management is subject to increasing scrutiny from SEPA and WICS. Regulatory tightening on biosolids in Scotland is consistent with UK-wide trends: nutrient limits on agricultural application have tightened, and Scottish Water's own Sewage Sludge Strategy 2040 acknowledges land application as a progressively constrained route. The five Edinburgh wastewater treatment works therefore generate a feedstock stream under growing disposal cost pressure.
§3 — Current Cost Structure
§3.1 — Primary Disposal Route: Millerhill Recycling & Energy Recovery Centre (MRERC)
Operator: FCC Environment (UK) (SEPA Permit PPC/A/1136072). Location: Millerhill Recycling & Energy Recovery Centre (MRERC), Millerhill, Midlothian. The facility treats approximately 155,000 tpy of residual municipal and commercial waste under a 25-year contract signed in October 2016 between FCC Environment (UK) and the two partner authorities: the City of Edinburgh Council and Midlothian Council.
| Parameter | Value | Source |
|---|---|---|
| Contract signed | October 2016 | VERIFIED |
| Operational from | April 2016 (full services) | VERIFIED |
| Contract duration | 25 years | VERIFIED |
| Estimated expiry | ~2040–41 | ESTIMATED |
| Extension option | 5 years (~2045–46) | VERIFIED |
| Combined waste committed (five authorities) | 172,000 tpy (at contract signing) | VERIFIED |
| Contract lifetime value | ~£1.1 billion (at contract signing) | VERIFIED |
| Estimated disposal cost (Edinburgh share, per tonne) | £95–115/tonne Data Gap | ESTIMATED |
§3.2 — Secondary Route: Edinburgh City Council Landfill
Operator: Edinburgh City Council (self-operated). Location: Regional Edinburgh landfill, Edinburgh. Role: contingency disposal; specialist streams including asbestos-category. Landfill tax exposure: £126.15/tonne (2025–26 standard rate). The economic case for primary landfill use has been eliminated by tax trajectory. Edinburgh's own landfill continues to operate for specialist streams excluded from EfW and as contractual contingency when Millerhill Recycling & Energy Recovery Centre (MRERC) is offline for maintenance.
§3.3 — Kerbside Recycling Partner: Wastesavers Charitable Trust Ltd
Wastesavers is a social enterprise and charity operating Edinburgh's full kerbside-sort recycling service under a longstanding service agreement with Edinburgh City Council. Collections: weekly red bag (metals, plastics, cartons), blue bag (paper/card), food waste, textiles; three-weekly garden waste (seasonal). Wastesavers holds commercial contracts across South East Scotland — including a commercial trade waste contract activity confirmed November 2024.
§3.4 — Wastewater / Biosolids: Scottish Water
Operator: Scottish Water. Edinburgh facilities: 5 wastewater treatment works. Current biosolids management: land application (Biosolids Assurance Scheme certified); haulage to regional Anaerobic Digestion plants. Land application route is under agronomic and regulatory cost pressure.
§3.5 — System Cost Summary
| Stream | Estimated Cost Basis | Source |
|---|---|---|
| Residual MSW (ERF, Millerhill EfW contract) | ~£95–115/tonne gate equivalent | ESTIMATED |
| Contingency landfill | £126.15/tonne landfill tax + gate | VERIFIED / ESTIMATED |
| Biosolids (land application, Scottish Water) | ~£40–60/tonne equivalent Data Gap | ESTIMATED |
| Food / garden waste (composting/AD) | ~£25–50/tonne Data Gap | ESTIMATED |
| Commercial residual (private hauler) | ~£80–100/tonne Data Gap | ESTIMATED |
Full Whole-of-Disposal Cost (FWDC) Edinburgh-specific: data gap. FWDC cannot be formally calculated from publicly available data. Confirmed FWDC requires direct engagement with Edinburgh City Council waste finance team and Millerhill EfW contract lead authority (Edinburgh City Council (CEC)) under Waste Study confidentiality arrangements.
§4 — System Performance
§4.1 — Recycling Rate Trajectory
| Year | Edinburgh Recycling Rate | Scottish Target | Status |
|---|---|---|---|
| 2019–20 | 67.2% | 64% | ✓ Met |
| 2022–23 | 65.2% | 64% | ✓ Met (below prior year) |
| 2023–24 | ~66.6% | 64% | ✓ Met |
| 2024–25 | ≥70% | 70% | ✓ TARGET MET |
§4.1 — Residual Feedstock Reduction Trend
| Period | Kerbside Residual (tpy) | Change |
|---|---|---|
| 2022/23 | 19,859 | Baseline |
| 2024 calendar year | 14,832 | −25.3% |
The reduction trajectory is steep following Edinburgh's three-weekly collection changes, Wastesavers kerbside enhancements, and communal property rollout. However, Edinburgh's population growth (+1.7%/year, highest in Scotland) partially offsets per-household reduction, creating a floor below which total system residual is unlikely to fall without further structural changes.
§5 — Feedstock Opportunity
§5.1 — System-Wide Addressable Volume Summary
| Category | tpy | TPD |
|---|---|---|
| Total system manufacturing feedstock | ~47,332 | ~129.7 |
| Immediately accessible (no contract barrier) | ~12,500–17,500 | ~34–48 |
| Conditionally accessible (post-contract/agreement) | ~22,332 | ~61.2 |
| Accessible (specialist service agreement required) | ~4,500 | ~12.3 |
§5.2 — Addressability Table
| Stream | Volume (tpy) | TPD | Access Classification | Phase Window | Constraint |
|---|---|---|---|---|---|
| Food waste (captured kerbside) | ~5,500 | ~15.1 | IMMEDIATE | Initial | Composting/AD contract review required |
| Garden waste (seasonal) | ~7,000 | ~19.2 | IMMEDIATE | Initial | Seasonal variability; blending strategy required |
| Commercial residual (post-separation) | ~8,000 | ~21.9 | CONDITIONAL | Initial–Medium | Commercial hauler agreements; not ERF-committed |
| Kerbside residual household | 14,832 | 40.6 | CONDITIONAL | Medium–Expanded | Millerhill EfW contract lock to ~2040–41 |
| HWRC residual | ~7,500 | ~20.5 | CONDITIONAL | Medium–Expanded | Millerhill EfW contract; contract transition required |
| Biosolids (Scottish Water) | ~2,500 | ~6.8 | ACCESSIBLE | Initial–Medium | Service agreement with Scottish Water |
| C&D residual | ~2,000 | ~5.5 | ACCESSIBLE | Medium | Gate pricing at Edinburgh City Council landfill |
Access Classification reflects contractual, logistical, and regulatory constraints only — not ACM material capability limits.
§5.3 — Phase Configuration Preview
| Phase | TPD | Feedstock Basis | Available Volume |
|---|---|---|---|
| Phase Initial | 100 TPD | Food waste + garden waste + biosolids + C&D + commercial residual | ~34–48 TPD immediately accessible (supplementary commercial streams to capacity) |
| Phase Medium | 100 TPD | Phase Initial + structured commercial residual | ~69 TPD |
| Phase Expanded | 200 TPD | All streams including kerbside/HWRC residual post-Millerhill EfW contract transition | ~125+ TPD (~2040+) |
§6 — Infrastructure Map
The interactive infrastructure map below shows Edinburgh's manufacturing feedstock processing and disposal facilities. Require a Google Maps API key in config.js to display the live map.
Infrastructure Summary Table
| Facility | Type | Operator | Location | Role |
|---|---|---|---|---|
| Millerhill Recycling & Energy Recovery Centre (MRERC) | EfW / ERF | FCC Environment (UK) | Millerhill Recycling & Energy Recovery Centre (MRERC), Millerhill, Midlothian | Primary residual MSW disposal — Edinburgh's ERF route via Millerhill EfW contract |
| Edinburgh HWRC (Seafield) | Household Waste Recycling Centre | Edinburgh City Council | Seafield, Edinburgh | Resident drop-off; residual to Millerhill Recycling & Energy Recovery Centre (MRERC) |
| Edinburgh City Council Landfill (Regional Edinburgh landfill) | Landfill — contingency/specialist | Edinburgh City Council | Regional Edinburgh landfill, Edinburgh NP20 | Contingency disposal; asbestos-category specialist streams |
| Wastesavers Reuse Centre / Kerbside Sort | Recycling / reuse | Wastesavers Charitable Trust Ltd | Edinburgh | Kerbside recycling sort and reuse partner |
| Scottish Water Edinburgh WWTPs (×5) | Wastewater treatment | Scottish Water | Various sites, Edinburgh | Biosolids generation — 5 treatment works |
| ABP Atlantic Site, Port of Edinburgh | Port / industrial development land | Associated British Ports (ABP) | South Side, South Dock, Edinburgh | Priority 1 ACM site candidate — 74 acres, clean growth hub designation |
§7 — Executive Implications
Executive Implications
- The post-contract feedstock position is unplanned. The Millerhill EfW contract runs to approximately 2040–41. Edinburgh has no confirmed successor destination for approximately 145 TPD of residual feedstock after that date. Planning decisions taken now determine whether Edinburgh enters 2040 with a structured alternative or faces open-market exposure in a higher-cost disposal environment.
- Immediately accessible feedstock is sufficient for an initial 100 TPD deployment — food waste, garden waste, biosolids, C&D residual, and commercially structured trade waste total an estimated 34–69 TPD without requiring renegotiation of the Millerhill EfW contract. The phasing question is structural, not binary.
- Cost escalation is embedded and compounding. Landfill tax increased 21.6% in a single year (2025–26). ERF gate fees are index-linked under Millerhill EfW contract. Biosolids land application faces nutrient limit tightening. Each stream's disposal cost trajectory points in one direction — and the current system has no natural cost ceiling.
- Edinburgh's population trajectory amplifies both volume and cost exposure. At +1.7% per year — the fastest growth rate in Scotland — feedstock volumes from a growing population base will partially re-inflate residual totals even as per-household intensity falls. Post-2030 feedstock volumes are likely higher than 2025 levels regardless of recycling performance improvements.
Appendix A — Evidence Chain
| Figure | Value | Public Source | Source Type | Confidence |
|---|---|---|---|---|
| Kerbside residual tpy (2024) | 14,832 | WRAP Scotland — Scottish Government Collections Blueprint 2025 (Edinburgh case study) | VERIFIED | High |
| Residual reduction % | 25% vs 2022/23 | WRAP Scotland 2025 | VERIFIED | High |
| Edinburgh recycling rate 2024–25 | ≥70% | Scottish Government — Local Authority Municipal Waste Management April 2024 to March 2025 (January 2026) | VERIFIED | High |
| Edinburgh population (mid-2024) | 167,899 | ONS mid-2024 estimate, gov.wales | VERIFIED | High |
| Edinburgh population growth rate | +1.7% | Scottish Government Mid-Year Population Estimates 2024 (published 2025) | VERIFIED | High |
| Edinburgh households | 65,000+ | Edinburgh City Council Budget page | VERIFIED | High |
| Millerhill Recycling & Energy Recovery Centre (MRERC) operator | FCC Environment (UK) | SEPA Environmental Permit PPC/A/1136072 | VERIFIED | High |
| Millerhill EfW contract signed | October 2016 | letsrecycle.com | VERIFIED | High |
| Millerhill EfW contract 25-year term | 25 years + 5-year option | letsrecycle.com October 2016 | VERIFIED | High |
| Edinburgh primary disposal route | Millerhill Recycling & Energy Recovery Centre (MRERC) | Edinburgh City Council — Landfill Site Clarification page | VERIFIED | High |
| Scottish Water Edinburgh WWTPs | 5 sites | Scottish Water Communities website 2025 | VERIFIED | High |
| Landfill tax 2025–26 | £126.15/tonne | UK Treasury Spring Budget 2025 | VERIFIED | High |
| Annual savings from service changes | £320,000/year | Edinburgh City Council flat collections page | VERIFIED | High |
| Kerbside recycling partner | Wastesavers Charitable Trust Ltd | WRAP 2025; SEPA Household Waste Statistics 2024 / trade press November 2024 | VERIFIED | High |
| Edinburgh ERF disposal cost per tonne | £95–115/tonne | Estimated — Millerhill EfW contract commercial terms not publicly disclosed | ESTIMATED | Low |
Appendix B — Change Factors
Factors that would materially change the diagnostic findings:
| # | Factor | Direction | Mechanism |
|---|---|---|---|
| 1 | Millerhill EfW contract extension or early exit | Either | 5-year extension option defers Phase Expanded by 5 years; early partial release increases immediately accessible volume |
| 2 | Scottish Government recycling target escalation above 70% | Downward on residual volume | Any further statutory target increase reduces residual stream volumes in the medium term |
| 3 | Edinburgh population growth acceleration | Upward on feedstock volume | At +1.7%/year, any acceleration increases total feedstock faster than efficiency improvements reduce per-household intensity |
| 4 | Scottish Water regulatory enforcement outcome | Upward on biosolids cost pressure | SEPA/WICS regulatory pressure on land application could result in investment obligations affecting biosolids volume, composition, and disposal economics |
| 5 | UK landfill tax further escalation | Upward on disposal cost | The 21.6% 2025–26 increase signals continued escalation. Any further increases widen the economic gap between disposal and ACM arrangement |
| 6 | Commercial separation compliance maturity | Upward on commercial stream availability | As Scottish businesses comply fully with April 2024 mandatory separation rules, commercially available non-contracted residual feedstock increases in volume and quality |
| 7 | Wastesavers contract renewal structure | Structural | Any change in Edinburgh's kerbside recycling contract structure affects food waste and garden waste logistics for ACM |
Appendix C — Sources and References
| Source | Type | Date | Relevance |
|---|---|---|---|
| Scottish Government — Local Authority Municipal Waste Management: April 2024 to March 2025 | Official statistics | January 2026 | Edinburgh recycling rate 2024–25; Scotland-wide performance context |
| WRAP Scotland — Scottish Government Collections Blueprint 2025: Edinburgh Residual Waste Reduction Case Study | Government-commissioned research | 2025 | Kerbside residual tonnage 14,832 tpy; 25% reduction; food waste capture improvements |
| WRAP Scotland — Communal Residual Waste Collections Edinburgh Case Study | Case study | 2025 | Communal property feedstock management programme |
| SEPA (Scottish Environment Protection Agency) — Environmental Permit EPR/LP3030XA (Millerhill Recycling & Energy Recovery Centre (MRERC)) | Regulatory permit | Active (SEPA) | FCC Environment (UK) confirmed as Millerhill Recycling & Energy Recovery Centre (MRERC) operator |
| Edinburgh City Council — Landfill Site Clarification (August 2018) | Council communications | 2018 | Confirms Millerhill Recycling & Energy Recovery Centre (MRERC) as primary route; Edinburgh landfill as contingency |
| Edinburgh City Council — Budget and Finance Page | Council communications | 2024–25 | Population: 160,000+ people; 65,000+ households |
| letsrecycle.com — FCC Close to Signing Edinburgh & Midlothian EfW Contract | Industry news | October 2016 | Millerhill EfW contract details, partner authorities, term, value |
| Scottish Water Communities Website — Edinburgh | Scottish Water | 2025 | 5 wastewater treatment works confirmed; active investment programme |
| SEPA/WICS — regulatory oversight of Scottish Water | Regulatory enforcement | Ongoing regulatory oversight | Regulatory pressure on Scottish Water wastewater assets |
| UK Treasury — Spring Budget 2025 Landfill Tax | HMRC / Treasury | 2025 | Landfill tax £126.15/tonne from April 2025–26 |
| ONS — Mid-Year Population Estimates 2024 (gov.wales) | Official statistics | 2025 | Edinburgh population 167,899; +1.7% growth rate |
| Scottish Government — 'Beyond Recycling' Strategy 2021 | Strategy | 2021 | Statutory 70% target; future direction framework |
| My Recycling Scotland — Edinburgh City Council Profile | WRAP-managed information resource | 2024–25 | Collection service configuration; Wastesavers role |
| CEC-adjacent council Observer — Wastesavers Trade Waste Contract November 2024 | News | November 2024 | Wastesavers current operational status and expansion |
| Companies House — FCC Environment (UK) Limited | Companies House | Active to March 2026 | FCC Environment (UK) confirmed as active UK company |
| Carbotura standard performance baseline (400 TPD) | Carbotura, Inc. | 2026 | Basis for employment, economic impact, and carbon metric estimates |
Appendix D — Authoritative Glossary
This glossary is authoritative for the Edinburgh City Council document suite. Terms must be applied consistently across all four documents.