Editing Pieee (section)

====Concentrating solar thermal with storage using calcium hydride for low cost dispatchable energy====
*'''Authors:'''  David Harries (EMCSolar, Australia), Wayne Bliesner (EMCSolar, Australia), John Davidson (EMCSolar, Australia)
*'''Contact email:''' john.davidson@emcsolar.com.au
*'''Scope:''' The energy storage technology being developed is a thermochemical energy heat storage system that uses solar radiation to drive highly endothermic chemical dissociation reactions.  The heat is recovered in a highly exothermic reformation reaction. The system has a significantly higher energy storage density than do conventional solar energy storage systems. It also operates at high temperature, which increase the thermodynamic and solar energy to electricity system efficiency. The thermochemical energy storage system being developed in this project is based on the dissociation of calcium hydride (CaH<sub>2</sub>).  As calcium hydride is heated it absorbs solar energy to drive the endothermic dissociation reaction at around 1000<sup>o</sup>C. Operating at this high temperature increases the reaction rates and the overall system efficiency.  As hydrogen gas is released, it is removed and stored in low temperature hydride storage vessels, a low cost bulk hydrogen storage technique, the calcium remains in the reactor vessel. When solar radiation levels fall, or the amount of electricity required increases (peak electricity demand periods), hydrogen is returned to reaction vessel and an exothermic reformation (fusion) reaction releases heat. All of the materials used, including calcium, hydrogen, sodium and aluminum are available in quantities that make it possible for large numbers (Gigawatts) of the solar energy storage plant to be built over the next 15 years.