At the heart of the Lloyd system is the Graphite Block Energy Storage System. High purity graphite has unique properties that make it ideal as an energy storage medium namely:-

• High melting point (over 3500°C)
• High specific heat (capacity to hold heat energy)
• Low emissivity (does not radiate heat readily)
• Extremely stable

The storage capacity of high purity graphite ranges from around 300kWh (thermal) per tonne at a storage temperature of 750°C to around 1000kWh (thermal) per tonne at 1800°C.

The Lloyd system has the ability to take heat into the storage block by many means

• Using electricity to heat via heating elements
• Using heat exchangers to take waste heat from industrial or commercial processes
• Taking concentrated solar energy to directly heat the graphite.