Cathal Renewable gas presentation 12.11.10Presentation Transcript
The Future of
Some Context ….
• Energy demand in Ireland has increased by 72% from 1991 to 2008 characterised by;
• The Renewable Energy targets are quite challenging;
• 40% of electricity to come from renewable sources by 2020
• 12% of heat to be derived from renewable sources by 2020
• Renewable resources to account for 10% of all transport fuel by 2020
• Ireland is making progress addressing RES (E);
• 11.8% of 2009 electricity consumption from renewable sources
• RES (H) and RES (T) progress towards targets have been slow to date;
• 3.6% of thermal energy and 1.2% of transport energy from renewable sources in 2008
• Landfill Directive
• Renewable gas produced from biomass using Anaerobic Digestion represents a significant and
under represented source of renewable energy in Ireland.
Biogas is produced when feedstocks, such as organic
wastes, and energy crops, are converted into biogas
using anaerobic digestion technology
Injection into the gas network may look like…
If quality is not good enough!
Compression Process Control, (CH4
Control (CH 4
Substrat (s) Methanisation Raw biogas (CO2,H2S, Upgraded gas
(few bars) CO2, water,S, H2O)
2 O2, H2 H 2S)
• Bio waste Composition: Composition
• Sewage • 50 - 65% CH 4 natural gas Odorisation/ LPG*
• Food - • 30 - 40% CO 2
• H2S Regulator for flow /
• NH 3
(shut -off valve, safety
valve … )
Control of gas
Out of the limits
Natural gas + Biogas Natural gas
Feed stock for Linkoping
7,000t/a of pig
Blood and process water
Collection over Scrubbing Compression
digester and storage
Biogas from grass as transport fuel in Salzburg
harvest weigh bridge
Biogas service station anaerobic digester
Source: energiewerkstatt, IEA and persona photos
Renewable Gas has a key role to play in a low carbon
future for Ireland
• Simple efficiency
measures across all
electricity fuels zero
• Decarbonise gas using
Opportunity– Renewable Heating
Biomethane for Heating
• Utilise the Bord Gáis gas network as a route to market for
renewable heating with biomethane (BioNG):
– Over 700,000 domestic and 30,000 I/C customers served
by the network.
– Uses existing meters (incl. Smart Meters when available).
– Minimal changes to supplier billing systems.
– No disruption to premises required – will allow customers
switch to renewable heating with a phone call!
– Used in existing appliances….. At very high efficiencies
• e.g. 80% for a gas boiler,
• as a renewable fuel source for domestic and I/C CHP
– Increases national fuel diversity and security of supply.
– Significant contribution towards the RES-H target possible.
Opportunity- Renewable Transport
Biomethane for Transport
• Utilise the Bord Gáis gas network as a route to
market for renewable transport with biomethane
– Over 11 million cars worldwide running on
CNG incl. Germany, Italy.
– Bi-fuel cars and vans available – can switch
from petrol to CNG seamlessly at the push of
– Significant contribution towards the RES-T
target possible and reductions in national
– Proven vehicle and re-fuelling options
Biomethane across Europe
Potential for Renewable Gas in Ireland
Figures converted from PJ to mscm natural Practical
Gas equivalent (@ 36.8 MJ/m³) (mscm pa)
Agricultural Slurry 51
Slaughter Waste 18.6
Surplus Grass 325.7
As % of total Irish gas demand 7.5%
• 1. 3,873,525 tonnes agricultural slurry x 12.8m3 methane (CH4) per tonne x 1/0.97= 51.3Mm3 biomethane per annum (with
97% CH4 content).
• 2. 870,000 tonnes OFMSW x 25% recoverable x 69 m3 CH4 per tonne x 1/0.97= 15.6 Mm3 biomethane per annum.
• 3. 208,877 tonnes slaughter waste x 86 m3 CH4 per tonne x 1/0.97= 18.6 Mm3 biomethane per annum.
• 4. 97,500 hectares x 3,240 m3 CH4 per hectare x 1/0.97 = 325.7 Mm3 biomethane per annum.
• 5. Conversion assumes biomethane has an energy content of 36.8 MJ/Mm3.
Irish Renewable Targets
• RES-E: 40% electricity from renewable sources by 2020.
• RES-H: 12% heating from renewable sources by 2020:
– Renewable energy accounted for 3.6% of thermal energy in 2008
– Bio methane could deliver 6.5% to this target
• RES-T: 10% renewable fuels for transport by 2020:
– Renewable energy accounted for 1.2% of transport energy in 2008
– Bio methane could exceed this target (12%)
• Source: SEI EPSSU Energy in Ireland Key Statistics 2009.
The Cost of Producing Biomethane
OFMSW (50,000 t/a) 0.14
Slaughter Waste (50,000 t/a) 0.73
Grass (137 ha, farm model) 0.97
Grass (137 ha, developer 1.10
Co-digest (slurry & grass) 1.23
Slurry (29,700 t/a) 1.83
The Cost of producing Biomethane, Green Gas Technologies Ltd., March 2010
Regional potential for grass
• Assessment criteria
– Pasture area
– Grass yields
– Current farming practice
– Gas grid coverage
– Availability of belly grass
Determing the regional potential for a grass biomethane industry, Submitted
to Applied Energy, October 2010.
gas grid &
Source: EPA Corine Land Cover Data
• Within an area of high
• High pasture coverage
• Good gas grid coverage
• Good availability of belly
• 20 km transport distance to
Ballyhoura: enough biomethane to heat
Annual Biomethane Energy Cars Houses
feedstock (Mmn3 yr-1) (PJ yr-1) (nr yr-1) (nr yr-1)
Grass silage 261,727 ha 910.6 33.37 855,696 644,250
5% grass 13,086 ha 45.5 1.67 42,785 32,213
Belly grass 5094 t 0.3 0.01 316 238
Total (5% 45.9 1.68 43,101 32,450
grass + belly
Number of private cars in Limerick (city + county): 84,170
Number of meter points in Limerick (city + county): 25,366