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This PhD thesis analyses the compatibility of large scale installations of the Na-beta technology for electrochemical stationary storage of electrical energy in the high voltage network, in order to support the electrical system in the management of the renewable energy sources. The reliability, the safety and the environmental compatibility of the two Na-beta batteries, i.e. the sodium-nickel chloride and the sodium-sulphur ones, were deeply analysed by means of detailed risk analysis. Moreover, an innovative modelling approach based on matrixes is presented for sodium-nickel chloride technology, which could be easily extended to the sodium-sulphur batteries, considering the similarities of these two technologies. Furthermore the presented modelling approach was validated by comparing the electrical model results with experimental measurements carried out in collaboration with Terna (the Italian Transmission System Operator) in the ENEA laboratories in Rome. A 7.8 kW module was tested and the agreement between measurements and the model results was very good.