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The work described in this report was carried out undercontract as part of the DTI New and Renewable Energy

Programme, which is managed by Future Energy

Solutions. The views and judgements expressed in this

report are those of the contractor and do not necessarily

reflect those of the DTI or Future Energy Solutions

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Photo 2: 1500 litre digester

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Daily Methane Yield for Ryegrass

Cubic Metres of Methane per Tonne of Organic Dry Matter

(March '04 - July '04)

640

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Photo 4: Biogas Plant

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41

ON- FARM ANAEROBIC DIGESTER Case Case Case

SIMPLE ECONOMIC ASSESSMENT A1 A2 A3

Annual Energy Crop Production tonnes per year 6,367 6,367 6,367

Annual Slurry Production tonnes per year 0 0 0

Total Digester Feedstock tonnes per year 6,367 6,367 6,367

Biogas Yield from Energy Crop m3 per day 2,003 2,003 2,003

Biogas Yield from Slurry m3 per day 0 0 0

Total Biogas Yield m3 per day 2,003 2,003 2,003

Energy Value of Biogas kW (fuel) 438 438 438

Potential CHP Electricity Production kW (electrical) 145 145 145

Potential CHP Heat Production kW (heat) 228 228 228

Process Heat kW (heat) 32 32 32

CHP Availability % 95 95 95

Usage Factor for Surplus Heat % 0 0 66

Gross Electricity Production MW.hrs per year 1,203 1,203 1,203

Net Useful Heat Production MW.hrs per year 0 0 1,174

Oil Equivalence of Useful Heat litres per year 0 0 138,165Value of Electricity per MW.hr 75 75 75

Value of Heat per MW.hr 20 20 20

Value of Gross Electricity Production per year 90,227 90,227 90,227

Value of Net Heat Production per year 0 0 23,488

Value of Energy Production per year 90,227 90,227 113,715

Area of Land Required for Energy Crops hectares 100 100 100

Cost of Production of Energy Crops per year 45,000 45,000 45,000

Cost of Land for Energy Crops per year 15,000 15,000 15,000

Percentage of Biofertiliser as Solid % 7 7 7

Production of Solid Biofertiliser tonnes per year 446 446 446

Production of Liquid Biofertiliser tonnes per year 5,921 5,921 5,921Value of Solid Biofertiliser per tonne 0.00 5.00 5.00

Value of Solid Biofertiliser per year 0 2,228 2,228

Labour Costs per year 8,000 8,000 8,000

Operating & Maintenance Costs per year 12,000 12,000 12,000

Summary of Economics - per year

Income

Value of Electricity 90,227 90,227 90,227

Value of Heat 0 0 23,488

Value of Solid Biofertiliser 0 2,228 2,228

Total Income 90,227 92,455 115,943

ExpenditureLabour Costs 8,000 8,000 8,000

Maintenance & Operating Costs 12,000 12,000 12,000

Cost of Energy Crops 60,000 60,000 60,000

Total Expenditure 80,000 80,000 80,000

Income less Expenditure 10,227 12,455 35,943

Capital Costs

Capital Cost of Plant 500,000 500,000 500,000

Capital Grant % 0 0 0

Net Capital Cost of Plant 500,000 500,000 500,000

Interest Rate % 7.0 7.0 7.0

Capital Pay-Back Period years 15 15 15

Average Annual Finance Cost per year 50,833 50,833 50,833

Income less Expenditure less Finance -40,607 -38,378 -14,890

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ON- FARM ANAEROBIC DIGESTER Case Case Case

SIMPLE ECONOMIC ASSESSMENT B1 B2 B3

Annual Energy Crop Production tonnes per year 6,367 6,367 6,367

Annual Slurry Production tonnes per year 7,352 7,352 7,352

Total Digester Feedstock tonnes per year 13,719 13,719 13,719

Biogas Yield from Energy Crop m3 per day 2,003 2,003 2,003

Biogas Yield from Slurry m3 per day 274 274 274

Total Biogas Yield m3 per day 2,276 2,276 2,276

Energy Value of Biogas kW (fuel) 545 545 545

Potential CHP Electricity Production kW (electrical) 180 180 180

Potential CHP Heat Production kW (heat) 284 284 284

Process Heat kW (heat) 68 68 68

CHP Availability % 95 95 95

Usage Factor for Surplus Heat % 0 0 66

Gross Electricity Production MW.hrs per year 1,498 1,498 1,498

Net Useful Heat Production MW.hrs per year 0 0 1,298

Oil Equivalence of Useful Heat litres per year 0 0 152,733Value of Electricity per MW.hr 75 75 75

Value of Heat per MW.hr 20 20 20

Value of Gross Electricity Production per year 112,338 112,338 112,338

Value of Net Heat Production per year 0 0 25,965

Value of Energy Production per year 112,338 112,338 138,302

Area of Land Required for Energy Crops hectares 100 100 100

Cost of Production of Energy Crops per year 45,000 45,000 45,000

Cost of Land for Energy Crops per year 15,000 15,000 15,000

Percentage of Biofertiliser as Solid % 5 5 5

Production of Solid Biofertiliser tonnes per year 680 680 680

Production of Liquid Biofertiliser tonnes per year 12,919 12,919 12,919Value of Solid Biofertiliser per tonne 0.00 5.00 5.00

Value of Solid Biofertiliser per year 0 3,400 3,400

Labour Costs per year 8,000 8,000 8,000

Operating & Maintenance Costs per year 12,000 12,000 12,000

Summary of Economics - per year

Income

Value of Electricity 112,338 112,338 112,338

Value of Heat 0 0 25,965

Value of Solid Biofertiliser 0 3,400 3,400

Total Income 112,338 115,737 141,702

ExpenditureLabour Costs 8,000 8,000 8,000

Maintenance & Operating Costs 12,000 12,000 12,000

Cost of Energy Crops 60,000 60,000 60,000

Total Expenditure 80,000 80,000 80,000

Income less Expenditure 32,338 35,737 61,702

Capital Costs

Capital Cost of Plant 560,000 560,000 560,000

Capital Grant % 0 0 0

Net Capital Cost of Plant 560,000 560,000 560,000

Interest Rate % 7.0 7.0 7.0

Capital Pay-Back Period years 15 15 15

Average Annual Finance Cost per year 56,933 56,933 56,933

Income less Expenditure less Finance -24,596 -21,196 4,769

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