Investigation · Riverbank Rewilding Series
The Connection Nobody Made
SEAI pays 5.66 cent per kWh for renewable heat generated from biomass — an ongoing tariff for up to 15 years. Coppiced native woodland from riparian buffer zones produces wood chips that feed biomass boilers. From Year 7, a dairy farm’s riparian buffer moves from loss to surplus. The data was always public. The two departments never connected it.
01 The SEAI Programme Nobody Connected
The Sustainable Energy Authority of Ireland administers the Support Scheme for Renewable Heat (SSRH) — an ongoing operational tariff for businesses and farms that generate renewable heat from biomass. The scheme pays a tiered rate based on heat output:
| Heat Output Band | Tariff (c/kWh) | Notes |
|---|---|---|
| First 300,000 kWh | 5.66 | Most farm-scale systems fall entirely within this band |
| Next 700,000 kWh | 3.02 | Larger commercial/community systems |
| Above 1,000,000 kWh | Lower | Industrial scale |
The tariff runs for up to 15 years per installation. It is paid on useable heat output from biomass boilers. For a farm-scale system producing under 300,000 kWh, the entire output qualifies at the top rate of 5.66c/kWh.
The Critical Detail
SSRH does not mention agriculture, riparian zones, or rewilding in its literature. It is marketed to businesses and community heating projects. A farmer applying for ACRES riparian buffers is never told about SSRH. A community applying for SSRH is never shown the biomass potential of riparian buffer zones. The programmes are invisible to each other.
SEAI also administers the EXEED programme (up to €3,000,000 per project for excellence in energy-efficient design) and the Community Energy Grant, which can fund biomass boilers and processing equipment. None of these mention agricultural rewilding as a biomass source.
02 What Grows in a Riparian Buffer
A 1.95-hectare riparian buffer planted with native trees doesn’t just sit there absorbing nutrients. From Year 7, it produces harvestable biomass through coppicing — cutting trees at the base on a rotation cycle, allowing regrowth from the stump.
Short Rotation Coppice Yields
- Species: Willow and alder (native, suitable for wet riparian soils)
- Yield: 8–12 oven-dried tonnes per hectare per year (Teagasc/Forest Research)
- Our model: 10 odt/ha/yr × 1.95 ha = ~20 odt/year
- Harvest cycle: Every 2–3 years
- Product: Wood chips for biomass boilers
20 oven-dried tonnes of wood chips per year is modest but meaningful. At a calorific value of approximately 4.2 MWh per oven-dried tonne, this produces roughly 84 MWh of energy. Passed through a biomass boiler at 85% efficiency, that’s about 71 MWh of useable heat.
The farmer has two options:
- Sell the chips: At approximately €70 per tonne, that’s ~€1,400/year
- Use in own biomass boiler: Claim SSRH at 5.66c/kWh on 71,000 kWh = ~€4,019/year — plus avoided heating fuel costs
The SSRH route is nearly three times more valuable than selling chips. A biomass boiler installation (supported by SEAI grants) transforms the riparian buffer from an environmental cost into a heating system with a government-backed revenue stream.
03 The Revenue Timeline
Rewilding revenue doesn’t start on day one. Native woodland takes time to establish before coppicing begins:
Setup costs of €12,500. Fencing, planting, mycorrhizal inoculation, alternative water supply. ACRES payments begin at €2,984/year.
Trees establishing. No biomass harvest yet. ACRES provides sole revenue stream. For dairy: net annual loss of €2,636. For suckler: net annual surplus of €1,648.
First harvest of coppiced wood. ~20 odt/year feeds biomass boiler. SSRH tariff begins: ~€4,019/year. Combined with ACRES: €7,003/year total revenue.
04 The Dairy Farm Calculation
Here is the corrected calculation for a dairy farm — the only enterprise where the compensation gap exists:
Without SSRH
10-year position: setup + gap (ACRES only)
With SSRH
10-year position: ACRES + SSRH from Year 7
The SEAI Effect
Improvement from connecting two government programmes
Dairy Farm 10-Year Model
- Year 0: Setup costs −€12,500
- Years 1–6: ACRES €2,984 − cost €5,620 = −€2,636/yr × 6 = −€15,816
- Years 7–10: ACRES €2,984 + SSRH €4,019 − cost €5,620 = +€1,383/yr × 4 = +€5,532
- 10-year total: −€22,784
Still a loss at 10 years. But the trajectory has reversed. By Year 7, the dairy farm is in annual surplus of €1,383. Over the full 15-year SSRH tariff (Years 7–21), this generates €20,745 — not enough to fully recover the €28,316 accumulated deficit from setup and Years 1–6. The SSRH alone does not achieve breakeven. However, if the biomass boiler replaces existing oil heating, avoided fuel costs of €4,000–6,000/year from Year 7 transform the picture entirely — breakeven is achievable within 12–15 years.
This is not a transformation. It is a meaningful improvement that cuts the dairy deficit by 41% over the first decade — from €38,860 to €22,784. For farms with existing heating demand, the combined benefit of SSRH tariff plus avoided fuel costs makes the proposition workable. The missing piece for all dairy farms is a bridge mechanism for Years 1–6.
05 The Extensive Farm Windfall
For suckler, sheep, and finishing farms, SSRH turns an already-profitable proposition into a genuine windfall:
Suckler Farm 10-Year Model
- Year 0: Setup costs −€12,500
- Years 1–6: ACRES €2,984 − cost €1,336 = +€1,648/yr × 6 = +€9,888
- Years 7–10: ACRES €2,984 + SSRH €4,019 − cost €1,336 = +€5,667/yr × 4 = +€22,668
- 10-year total: +€20,056
A suckler farmer who creates a riparian buffer and installs a biomass boiler is €20,056 better off over 10 years. This is not a marginal incentive. It is a significant income stream for farms already operating on thin margins.
The economics are even more striking when you consider that suckler farming averages a net margin of −€5 per hectare (Teagasc NFS 2023). A riparian buffer with SSRH effectively subsidises the rest of the farm.
06 Why This Wasn’t Discovered
The answer is depressingly simple: departmental silos.
DAFM publishes farm economics data and administers ACRES. SEAI publishes energy tariffs and administers SSRH. EPA publishes water quality data. Each department has excellent data — in isolation. Nobody’s job description includes connecting them.
A farmer applying for ACRES is never told about SSRH. A farm considering a biomass boiler through SEAI is never shown the free biomass growing in their riparian buffer. An EPA officer reporting water quality failures is never given the economic analysis showing that the solution could generate income.
Every number in this analysis is publicly available. Every programme is live and funded. Every farm with river frontage could be assessed automatically. The only thing missing is a conversation between departments that share a government.
Next: Algae and the Nutrient Nobody Wants
Separate from the riparian buffer economics, algal capture systems can harvest excess nutrients from river water as biomass. A different technology, a different scale of investment, and a different set of questions.
Sources
- SEAI, Support Scheme for Renewable Heat: Tariff Schedule — 5.66c/kWh (first 300,000 kWh), 3.02c/kWh (next 700,000 kWh), up to 15 years
- SEAI, EXEED Grant Scheme — up to €3,000,000 per project
- Teagasc, Short Rotation Coppice Willow Best Practice Guidelines — 8–12 odt/ha/year
- Forest Research UK, Short Rotation Coppice: Yield and Productivity — 7–12 odt/ha/year on good sites
- Teagasc, National Farm Survey Enterprise Factsheets 2023
- DAFM, ACRES Terms and Conditions 2023–2027