Biogas or green gas: how to choose?

In recent years, energy suppliers offers have considerably been diversified. Cheaper electricity and gas, alternative suppliers, connected or intelligent devices… There are many options to save on your energy bill. But if your project is, in addition, to reduce waste volume produced every day and to benefit from a favorable alternative to the energy transition, discover renewable or green energies and among them, biogas, also called green gas.


What is biogas?

Biogas is a biological product obtained by the decomposition of organic waste. This technique is called methanization. In this sense, it is part of renewable energy. This is why it is also called “green gas”.

Apart from its production technique, biogas is in all respects similar to natural gas and can be used :


  • To heat a home with a boiler or eventually, by injection into the distribution network,
  • For cooking, because biogas is a clean and renewable energy,
  • As fuel for vehicles, thanks to dedicated service stations,
  • For electricity production and heat, thanks to cogeneration.

It should also be noted that the residues of methanization can be used as natural fertilizer by farmers.


The principle of methanization

Methanization is actually a fermentation of organic waste in a vacuum. Their decomposition causes the appearance of a raw gas which, once refined, forms biomethane or biogas.


The methanization process takes place in three stages : collection of raw materials, mixing in tanks and finally purification.


Biogas raw materials

The organic waste required to produce green gas comes from a variety of sources ; food waste from canteens and catering services, agricultural or agri-food industry waste, sludge from sewage treatment plants, etc.


The very fact of harvesting this organic matter tends to be part of a process of global reduction and recovery of waste that is currently in full development.


Brewing phase

Once sorted, these organic materials are deposited in huge tanks called “digesters”. There, placed in an airtight medium and totally under oxygen vacuum, they will be stirred and heated for several weeks to accelerate the decomposition process.



At the end of the brewing period, two forms of energy are recovered : digestate, a type of natural fertilizer, and biogas, composed mainly of ethane (CH4), carbon dioxide (CO2) and water.


It is this form of green gas that must then be purified before being injected into the natural gas network. Biogas then changes its formula and name, to become biomethane.


Green gas benefits

The main advantage of biogas is that it is a renewable energy source. Relevant in terms of heating and waste management, green gas is becoming more and more popular. While for the time being it is mainly used as a fuel for vehicles, biogas could soon be used directly to supply heating systems for private individuals.


For the planet and the environment, green gas contributes to reducing the greenhouse effect. It is also a developing alternative to fossil fuels, produces a natural fertilizer for agriculture and allows waste to be recycled in its facilities.


In 2015, the French Energy Transition Law presented the project to increase the use of “green” gas to 10% by 2030.


So, natural gas, biogas or electricity?

Therefore, if you want to use renewable energies for your home, there are many possibilities, especially since French energy suppliers such as Veolia, Direct Energie or Suez, are increasingly present in the “green offers” niche. Biogas, and green electricity from wind, solar or hydro power, are the main options available to you.


Boilers, reversible air conditioning, electric radiators, convectors… individual and collective heating systems are varied, as are the possibilities for energy savings. In the case of green electricity, it should be noted that the price per kWh compared to regulated rates is lower for some operators.


However, the heat production appliance(s) are not the only ones involved in the thermal comfort and energy recovery level of your home. Its insulation quality, its exposure, but also the region in which you are located, all have an impact.


That’s why, to help you make the best use of your equipment, French companies like Netatmo offer you their intelligent and connected devices for better energy management.


Save energy more easily

Today, the growth of the connected home and smart objects offers us ever more possibilities to calculate, adjust, anticipate and personalize our energy consumption. This is particularly the case with Netatmo’s intelligent heating solutions : Smart Thermostat and Smart Thermostatic Heads.


Netatmo Smart Thermostat is compatible with the majority of individual gas, biogas, oil or wood-fired boilers. It can be easily installed as a replacement for your wired thermostat or as a stylish and discreet wireless thermostat. Thanks to its multiple functions, you can keep your mind at ease.


Its Auto-Adapt function takes into account the insulation of the house and the outside temperature, to anticipate the heating period. The Energy Savings Report sends you a monthly summary of your consumption and advice on how to better manage your schedule. The Remote Control function allows you to control your heating from the Netatmo Energy application on smartphones and tablets. Finally, Auto-Care monitors the power supply to the Thermostat and informs you in the event of a heating anomaly.


Day or night, in your presence or absence, automatically thanks to your personal or manual programming, the Netatmo Smart Thermostat regulates the temperature of your home while offering you the possibility to optimize your energy consumption.


Do you live in a collective dwelling where you cannot decide on the heating period ? Netatmo’s Additional Smart Thermostatic Heads allow you to easily take control of each radiator installed in your apartment. Moreover, their installation is child’s play, just screw them in place of the old ones.


Thanks to their Intelligent Control function, they detect the level of sunlight in each room and adjust the heating temperature alone. In addition, each valve is able to locate the open windows around it, and automatically shut off to avoid wasting energy. As with the Thermostat, the Thermostatic Heads can also be controlled remotely or manually.


Thanks to them, you benefit from the comfort of individual heating in a collective dwelling.



Room-by-room comfort

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