System comprising - a high temperature electrolyser (HTE), - a first supply line of the electrolyser configured to supply steam to the electrolyser , - a first electrolyser discharge line configured to discharge dihydrogen from the electrolyser , - a second electrolyser discharge line configured to discharge dioxygen from the electrolyser , - a first heat exchange module configured to provide heat exchange between the first steam supply line and the first dihydrogen discharge line , - a steam generator arranged on the first steam supply line , upstream of the first heat exchange module , and configured to produce steam from liquid water, characterised in that the system comprises a module for recovering the thermal energy of dihydrogen at the output of the first heat exchange module for the benefit of the first steam supply line , the recovery module comprising: o a compressor arranged on the first dihydrogen discharge line , downstream of the first heat exchange module , and configured to compress the dihydrogen, o a first heat exchanger arranged between the first steam supply line , upstream of the steam generator , and the first dihydrogen discharge line , downstream of the compressor , so as to transmit the thermal energy of the compressed dihydrogen to the liquid water, upstream of steam generator , and that the system comprises a second electrolyser supply line configured to supply air to the electrolyser and a third heat exchanger arranged between the first dihydrogen discharge line , downstream of the first heat exchanger of the energy recovery module, and the second air supply line . - a high temperature electrolyser (HTE), - a first supply line of the electrolyser configured to supply steam to the electrolyser , - a first electrolyser discharge line configured to discharge dihydrogen from the electrolyser , - a second electrolyser discharge line configured to discharge dioxygen from the electrolyser , - a first heat exchange module configured to provide heat exchange between the first steam supply line and the first dihydrogen discharge line , - a steam generator arranged on the first steam supply line , upstream of the first heat exchange module , and configured to produce steam from liquid water, characterised in that the system comprises a module for recovering the thermal energy of dihydrogen at the output of the first heat exchange module for the benefit of the first steam supply line , the recovery module comprising: o a compressor arranged on the first dihydrogen discharge line , downstream of the first heat exchange module , and configured to compress the dihydrogen, o a first heat exchanger arranged between the first steam supply line , upstream of the steam generator , and the first dihydrogen discharge line , downstream of the compressor , so as to transmit the thermal energy of the compressed dihydrogen to the liquid water, upstream of steam generator , o a compressor arranged on the first dihydrogen discharge line , downstream of the first heat exchange module , and configured to compress the dihydrogen, o a first heat exchanger arranged between the first steam supply line , upstream of the steam generator , and the first dihydrogen discharge line , downstream of the compressor , so as to transmit the thermal energy of the compressed dihydrogen to the liquid water, upstream of steam generator , and that the system comprises a second electrolyser supply line configured to supply air to the electrolyser and a third heat exchanger arranged between the first dihydrogen discharge line , downstream of the first heat exchanger of the energy recovery module, and the second air supply line . <EOS>