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ITEN

Use of natural gas

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70.63 billion cubic meters of natural gas was injected into the national gas pipeline network in 2016

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A gas-powered combined cycle with an output of 56-58%, makes it possible to reduce CO2 emissions  by 62% compared with a coalpowered plant.

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For the same energy input, the carbon dioxide produced by the combustion of natural gas is 25-30% less than oil products

Natural gas is an environmentally friendly fuel. In fact, based on the same energy used, it has a lower polluting impact compared to other fossil fuels.

Natural gas helps to reduce atmospheric emissions by replacing polluting fossil fuels and reducing problems of air quality, acid rain and greenhouse gas emissions (GHG). Natural gas is mainly composed of methane (CH4) and the main products resulting from its combustion are carbon dioxide (CO2) and water vapour, the same components that are produced by breathing.

For the same energy input, the carbon dioxide produced by the combustion of natural gas is:

  • 25-30% less than oil products
  • 40-50% less than coal.

    Coal and fuel oil are composed of very complex molecules with high carbon, nitrogen and sulphur content. This means that, during combustion, coal and oil release higher levels of harmful emissions (carbon, nitrogen oxides – NOx – and sulphur dioxide – SO2) and unburnt particles compared to natural gas.

    The combustion of natural gas, on the other hand, releases small amounts of sulphur dioxide and nitrogen oxides, does not generate ash emissions or particulates, and emits low levels of carbon dioxide, carbon monoxide, and other reactive hydrocarbons.
    The decrease in emissions per unit of energy produced is further accentuated by the possibility of using natural gas in high-performance applications and technologies, such as condensation boilers, co-generation plants and combined cycles for producing electricity. A gas-powered combined cycle with an output of 56-58%, compared with an output of about 40% from traditional steam-powered cycles, makes it possible to
    reduce CO2 emissions by 52% compared with a traditional fuel oil-powered plant and by 62% compared with a coalpowered plant.

Gas is an accessible source, given the presence of considerable reserves near Europe and the development of the liquefied natural gas global market which has increased availability at low prices.

Lastly, the gas system can count on existing transportation, storage and distribution systems and is capable of supporting Italian and European decarbonisation guaranteeing the energy system flexibility, programmability and cost effectiveness. This is also thanks to a gas-based electricity generation capacity that is already widely available and extremely efficient.

 

GAS AND TECHNOLOGICAL INNOVATION FOR FIGHTING CLIMATE CHANGE

Power to Gas
The natural gas network can play an essential part in managing the ever-increasing volumes obtained from renewable sources. The excess electricity produced by solar power stations or wind farms can actually be converted into hydrogen through an electrolysis process and then enriched with CO2, making it possible to produce a syngas to be injected into the network. This avoids investment costs in new infrastructures for the transmission, distribution and storage of electricity.

In Italy, for over 70 years so-called town gas, made up of mixtures with 50% hydrogen content has been distributed in cities without problems.

Europe is keeping a careful eye on the new technology, which has already been included in the German national energy programme.

Gas-powered Heat Pumps
This is a technology that makes it possible to combine the many advantages of natural gas with the operating principle of heat pumps. Thanks to the exploitation of ambient heat, which is renewable and free, it is actually possible to improve output compared with normal condenser gas boilers. Output indicates the useful energy produced with the gas energy used.

The optimum output of a condenser boiler is equal to approximately 110%, but with gas-powered heat pumps it is possible to achieve a figure of up to 170%.

The national gas pipeline network helps meet the country’s energy demand.

In 2016 a total of 70.63 billion cubic metres of gas was injected into the network, an increase of 3.38 billion cubic metres (+5.0%) compared with 2015.

Injections into the network from domestic production fields or their collection and treatment centres totalled 5.57 billion cubic metres, down by 0.86 billion cubic metres (-13.4%) compared with 2015.

Volumes injected at entry points connected with other countries and with regasification plants, overall equal to 65.06 billion cubic metres, rose by 4.24 billion cubic metres (+7.0%) compared with 2015. This change was due mainly to higher volumes injected at the Mazara del Vallo entry point (+11.63 billion cubic metres) and the LNG regasification plants (+0.53 billion cubic metres; +9%), the effects of which were partly offset by lower volumes injected at the entry points of Gries Pass (-3.93 billion cubic metres; -37%), Gela (-2.30 billion cubic metres; -32.3%), Tarvisio (-1.66 billion cubic metres; -5.5%) and Gorizia (-0.03 billion cubic metres).

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View the operating data of the national transmission network in the 2016 Annual Report

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Find out how Snam manages its emissions

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Read more about the history of natural gas in Italy

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updated
19 April 2017 - 15:09 CEST