Assembly, comprising: - an SOEC/SOFC type solid oxide stack operating at high temperature, comprising: - a plurality of electrochemical cells each composed of a cathode, an anode and an electrolyte intercalated between the cathode and the anode, - a plurality of intermediate interconnectors each formed between two adjacent electrochemical cells, - an upper terminal plate and a lower terminal plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a standalone clamping system for the SOEC/SOFC type solid oxide stack operating at high temperature, comprising: - an upper clamping plate and a lower clamping plate between which the SOEC/SOFC type solid oxide stack is clamped, each plate comprising at least one clamping orifice, each of the upper terminal plate and the lower terminal plate being in contact with at least one of the upper and lower clamping plates or at least one electrical insulation plate of the clamping system located between the SOEC/SOFC type solid oxide stack and at least one of the upper and lower clamping plates, - at least one clamping rod that will extend through a clamping orifice in the upper clamping plate and through a corresponding clamping orifice in the lower clamping plate to enable assembly of the upper and the lower clamping plates to each other, - clamping means (16, 17, 18, 20, 21) at each clamping orifice of the upper and lower clamping plates designed to cooperate with said at least one clamping rod to assemble the upper and lower clamping plates to each other, said clamping means (16, 17, 18, 20, 21) comprising at least one first clamping nut associated with at least one clamping washer at each clamping orifice of one of said upper and lower clamping plates designed to cooperate with said at least one clamping rod inserted through the clamping orifice, said at least one clamping rod and said at least one first clamping nut being made from a super alloy based on nickel, said at least one clamping washer and said upper clamping and lower clamping plates being made of refractory austenitic steel. - an SOEC/SOFC type solid oxide stack operating at high temperature, comprising: - a plurality of electrochemical cells each composed of a cathode, an anode and an electrolyte intercalated between the cathode and the anode, - a plurality of intermediate interconnectors each formed between two adjacent electrochemical cells, - an upper terminal plate and a lower terminal plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a plurality of electrochemical cells each composed of a cathode, an anode and an electrolyte intercalated between the cathode and the anode, - a plurality of intermediate interconnectors each formed between two adjacent electrochemical cells, - an upper terminal plate and a lower terminal plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a standalone clamping system for the SOEC/SOFC type solid oxide stack operating at high temperature, comprising: - an upper clamping plate and a lower clamping plate between which the SOEC/SOFC type solid oxide stack is clamped, each plate comprising at least one clamping orifice, each of the upper terminal plate and the lower terminal plate being in contact with at least one of the upper and lower clamping plates or at least one electrical insulation plate of the clamping system located between the SOEC/SOFC type solid oxide stack and at least one of the upper and lower clamping plates, - at least one clamping rod that will extend through a clamping orifice in the upper clamping plate and through a corresponding clamping orifice in the lower clamping plate to enable assembly of the upper and the lower clamping plates to each other, - clamping means (16, 17, 18, 20, 21) at each clamping orifice of the upper and lower clamping plates designed to cooperate with said at least one clamping rod to assemble the upper and lower clamping plates to each other, said clamping means (16, 17, 18, 20, 21) comprising at least one first clamping nut associated with at least one clamping washer at each clamping orifice of one of said upper and lower clamping plates designed to cooperate with said at least one clamping rod inserted through the clamping orifice, - an upper clamping plate and a lower clamping plate between which the SOEC/SOFC type solid oxide stack is clamped, each plate comprising at least one clamping orifice, each of the upper terminal plate and the lower terminal plate being in contact with at least one of the upper and lower clamping plates or at least one electrical insulation plate of the clamping system located between the SOEC/SOFC type solid oxide stack and at least one of the upper and lower clamping plates, - at least one clamping rod that will extend through a clamping orifice in the upper clamping plate and through a corresponding clamping orifice in the lower clamping plate to enable assembly of the upper and the lower clamping plates to each other, - clamping means (16, 17, 18, 20, 21) at each clamping orifice of the upper and lower clamping plates designed to cooperate with said at least one clamping rod to assemble the upper and lower clamping plates to each other, said clamping means (16, 17, 18, 20, 21) comprising at least one first clamping nut associated with at least one clamping washer at each clamping orifice of one of said upper and lower clamping plates designed to cooperate with said at least one clamping rod inserted through the clamping orifice,