Enriched biogas (biomethane) can be a substitute for various types of motor fuels: compressed natural gas (CNG), gasoline, diesel, liquefied natural gas (LNG), liquefied petroleum gas (LPG). Compressed gas installations can be completed with both diesel and gasoline vehicles. Many automakers already have natural gas (CNG) vehicles in their lineup. For example, Mercedes-Benz manufactures both passenger and commercial vehicles and trucks that run on CNG. Various CNG models are also offered by Fiat, Skoda, Seat, Opel, Ford, Audi, Renault, Iveco, Scania, Volvo, Neoplan and others.
Methane agricultural machinery is also on the market, such as New Holland and Massey Ferguson tractors. The interest in using CNG as a motor fuel is due to a number of operational and economic benefits, which are detailed in the UkrAvtoGas publication. The use of compressed or liquefied biomethane in several EU countries also has economic, environmental and even reputational prerequisites. And can compressed biomethane compete with motor fuels from fossil sources in Ukraine?
Comparing CNG prices in different countries in Europe, we can see that the price in Ukraine is one of the lowest in the world, is in the lower price range (Fig. 1) and is currently 5.37 cents/kWh (0.51 €/m²). The highest price in Sweden is 13.78 euro cents/kWh (1.31 €/m³), one of the leaders in the use of compressed biomethane in transport. It should be noted that the production and consumption of biomethane for transport in different European countries, where this is the case, is necessarily stimulated by different financial mechanisms. The increased price of fossil fuels, generated by additional environmental taxes and excise taxes on fossil fuels, is in fact the basic economic precondition for the development of the biomethane market. This, together with various kinds of additional direct and indirect financial bonuses, allows giving the necessary impetus to the development of the biomethane market in a given direction, which in turn enables the governments of the countries to realize their own strategic plans in the energy sphere.
* – total CNG cost from biomethane, estimated by UABio for a biomethane plant with a capacity of 2330 nm³/h; ** – cost of biomethane according to the European Biogas Association 
The cost of compressed biomethane in Ukraine can be 3.8… 5.9 euro cents/kWh, depending on the raw material component of biomethane 0…2.1 euro cents/kWh, respectively. It is evident that current prices for compressed natural gas at UkrAvtoGaz gas stations are comparable to the cost of production of compressed biomethane, however, this does not give grounds, under market conditions, to consider biomethane competitive with CNG in Ukraine.
For the investment attractiveness of the production of compressed biomethane with IRR at 20%, its market price should be at least 5.9…8.0 euro cents/kWh (0.57…0.77 €/m³). In addition, it should be understood that the potential for the production of biomethane with a raw material component cost close to zero is quite limited, and therefore it is necessary to count on the widespread use of more expensive raw materials for the production of biogas (corn silage, crop residues).
The price of compressed biomethane at gas stations in several EU countries is slightly higher than the price of compressed natural gas. For example, in Estonia, at a price of CNG of 0.86 €/kg, the price of biomethane is 0.9 €/kg (+4.7%), which, with a slight difference in the calorific value of both fuels, means a virtually equal unit energy price. In Finland, at a price of CNG of 1.21 €/kg, the price of biomethane is 1.34 €/kg (+10.7%). Buying a more expensive analog of natural gas at a gas station can be stimulated by certain indirect financial bonuses. In Sweden, for example, the use of biomethane on transport is subsidized at the expense of special tax benefits, in addition, biomethane transport is exempt from parking charges and has other logistical benefits.
When comparing the cost of production of compressed biomethane with the cost of liquid fuels – gasoline and diesel, the competitiveness of biomethane is obvious. Thus, at the economically reasonable price of biomethane as a motor fuel at 6… 8 euro cents/kWh, the equivalent price for diesel and gasoline (A-95) in Ukraine today is 9.32 and 1.07 euro cents/kW∙h, respectively.
However, when choosing between biomethane and natural gas, the owner of a car in Ukraine is more likely to prefer the latter, since there is already a network of gas stations on natural gas, the price of which is significantly lower than the economically justified selling price of compressed biomethane. However, there are no additional benefits or incentives for biomethane refueling at this time.
There is an obvious need to develop and implement in Ukraine mechanisms of financial and other support for the production and consumption of biomethane as motor fuel. It is worth using the experience of countries where biomethane is being actively developed in transport (Sweden, Finland, Italy, Switzerland).
The existing National Renewable Energy Action Plan for 2020 and the Energy Strategy of Ukraine until 2035 do not include any mention of biomethane as such and on transport in particular. As a renewable kind of motor fuel, the consumption of bioethanol and biodiesel has been actively lobbied in recent years in Ukraine but without focusing on biomethane as a motor fuel.
State support for BM development requires the introduction of state targets and commitments for the share of biomethane use in the transport sector. The national energy strategy should include BM development goals (for example, 5-10% by 2030) and determine the number of biomethane gas stations.
Under this approach, government regulations can introduce a support scheme for BMs that are fed into gas networks for future use in the transportation sector. The scheme may be financed by fuel suppliers as part of the biomethane/renewable fuel commitment.
The scheme can work using renewable fuel production/consumption certificates. The implementation of the scheme requires the development of specifications and state standards for biomethane, which is used as motor fuel.
The introduction of mechanisms that encourage the production and consumption of biomethane also requires the development and implementation of a national biomethane registry.
Author: Petro Kucheruk
 Natural gas density 0.7 kg/nm³ and a lower calorific value of 9.5 kWh/nm³ are taken into account