Sustainability Journal



May 2014 Issue (files are in PDF format)



Backing up Energy Supplies Exergy stores plus local back-up facilities would make our buildings almost completely resilient, and would at the same time reduce the costs as compared to the existing "supply must match the demand" type of power grid.

How much energy could be stored under the ground in Ottawa? Enough to exceed all of Canada's energy demands, but we will still need to generate electricity.

Power Supply Reliability The use of a HUB to control the thermal storage for exergy stores has an additional advantage - it provides the basis for operating the power grid so that power is almost always available to the end users. The grid operator controls both the charging times for the stores and the timing, location and extent of the use of back-up generators at the consumer end of the chain.