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This paper examines the utilization of metro fog data centres and access fogdatacentres with integrated solar cells and Energy Storage Devices (ESDs) toassist cloud data centres in caching Video-on-Demand content and hence, reducethe networking power consumption. A Mixed Integer Linear Programming (MILP)model is used to optimize the delivery of the content from cloud, metro fog, oraccess fog datacentres. The results for a range of data centre parameters showthat savings by up to 38% in the transport network power consumption can beachieved when VoD is optimally served from fully renewable-powered cloud ormetro fog data centres or from access fog data centres with 250 m2 solar cells.Additional 8% savings can be achieved when using ESDs of 100 kWh capacity inthe access fog data centres.

Caching Video-on-Demand in Metro and Access Fog Data Centres