They're testing a concept here that's basically under-water balloons to store potential energy: http://hydrostor.ca http://hydrostor.ca It's a pretty small-sca

They're testing a concept here that's basically under-water balloons to store potential energy: http://hydrostor.ca http://hydrostor.ca It's a pretty small-scale experiment, but everything has to start somewhere. The Deep Lake Cooling Project was prototyped at some point and that's well into production now, providing inexpensive cold water for chillers through the downtown core: http://www.canadianconsultingengineer.com/features/toronto-waterfront-toronto-cools-off-naturally-a-deep-lake-water-cooling-system/ http://www.canadianconsultingengineer.com/features/toronto-w... The Hydrostor project is roughly located in the same area as the Deep Lake intake pipe comes ashore.