Biomethane News - CNG Services

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Bio-SNGBiomethane can be produced during the conversionof a thermally-derived synthetic gas into methane.This is known as Bio-SNG (synthetic natural gas). TheRegional Bio-SNG Project funded by Nepic, NationalGrid and Centrica aims to provide an evaluation of theviability of Bio-SNG as a technology option in the UK. Afeasibility study was carried out by CNG Services andProgressive Energy which provided proposals for a leadproject in the North East.Biomethane NewsKazakhstanjoint venture by KazTransGas and BG Kazakhstanhas resulted in Kazakhstan’s first CNG fillingAstation. The station in Almaty City has a capacity of2000m3 which will fuel 240 buses, 200 of which havealready been purchased by Akimat of Almaty. Thismarks the beginning of KazTransGas’ “Concept onExpansion of CNG as a motor fuel for 2010-2015” withinvestment funds totalling KZT 600 million.The concept aims to convert around 50,000 vehiclesin Kazakhstan to run on CNG fuelled by a network ofover 100 filling stations, at a cost of around KZT 20billion. It is hoped that by promoting CNG as a vehiclefuel it will push Kazakhstan towards a cleaner, moresustainable future.CNG Services provided design and project managementsupport to BG on this project. For details pleasecontact: nick.harbord@cngservices.co.ukTwo feedstock types are being trialled; the first is ‘indigenouswaste’ and the second is woody biomass. Theformer targets a moderate scale capacity potentiallysupplying 15,000 homes, whilst the latter targets a largerscale that could supply up to 100,000 homes.The long term vision is to use the existing gas grid totransport Bio-SNG to customers.For details of the Bio-SNG project please contact:john.baldwin@cngservices.co.ukCNG EconomicsWith the availability of new CNG vehicles made bythe likes of Mercedes Benz, CNG Services is workingon a number of CNG filling station feasibility studies.Whilst the 20% CO 2saving of diesel-CNG dual fuel isimportant, the economics of CNG are the key. The priceof CNG is made up of various elements as follows :1) The price of gas from the grid which is currentlyaround 50 p/therm if bought on a 'flat profile' (i.e. sameamount all year, no seasonality). 1 therm is 2 kg, so assume25 p/kg for gas.2) The fuel duty on CNG which is 25.05 p/kg3) Compression charges, fixed maintenance and capacityrelated gas transportation and electricity supplytariffs which can be calculated in p/kg - can be anythingfrom 20 p/kg to 40 p/kg depending on the size, throughputand also required reliability (i.e. if the vehicle onlyruns on CNG like an Econic Refuse truck you need morefilling station assets than if it was dual fuel diesel-CNGtractor or a bi-fuel Sprinter). Assume around 30 p/kg4) Variable costs such as variable maintenance (runninghours related) and variable gas transportationand electricity supply costs. Assume around 10 p/kgSo total would be around 90 p/kg for CNG of which30 p/kg is fixed and 60 p/kg is variable.This means that once a customer has covered thefixed cost in any year then any additional CNG reducesin cost to 60 p/kg. The best way to see what itcosts on CNG is to take a km/kg figure. So, a SprinterNGT will do around 12 km per kg. At 90 p/kg thatmeans it costs around 8.5 p/km. If you are above theminimum in a year (i.e. fixed costs covered) it falls to60 p/kg so that is 5 p/km. This is simplest way to workout the economics. It's all about throughput. It alsomakes it easy to compare with diesel.For information on our CNG Feasibility Studyplease contact: jen.clayton@cngservices.co.uk
Biomethane NewsIntroducing the Green Gas Certificate SchemeThe Green Gas Certification Scheme (GGCS) enablesbiomethane (‘green gas’) to be trackedthrough the supply chain, ensuring certainty for thosethat buy it.CNG Services along with six other companies includingNational Grid, Eon, Centrica and Bio Groupfounded the scheme, which will be run by a subsidiaryof the Renewable Energy Association (REA), theRenewable Energy Assurance Ltd.The scheme works on the basis that each unit ofgreen gas injected into the grid displaces a unit of fossil-derivednatural gas. The GGCS tracks each unit ofgreen gas from its injection into the gas grid throughany number of trades to its sale to a consumer. Itmonitors the contractual rather than physical flowsto ensure there is no double-counting of the gas.Each kWh of green gas is electronically labelled witha unique identifier, the Renewable Gas Guarantee ofOrigin (RGGO), that contains information relating towhere, when and how the gas was produced. Thisacts as an assurance that the green gas traded orbought is authentic and has not been sold to anotherparty.There are a number of possibilities being considered.One tonne of food waste from a supermarket wouldmake around 80 m3 of methane which is around 60kgof CNG or 80 litres of diesel. This would fuel a Sprinterfor around 500km. The Green Gas Certificates couldtrack this gas and show that the Sprinters were actuallyfuelled by gas made from the food waste.Another option is to use Green Gas Certificates tosupply gas fired CHP plants for new housing with districtheating to provide a means to provide low carbonenergy to new housingThe following schematic shows how the GGCS systemwill work:For details please contact:john.baldwin@cngservices.co.uk
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