Other sources of thermal energy storage contain warmth or cold produced with heat pumps from off-peak, low price electric powered power–a follow called peak shaving; warmth from combined heat and electrical power vegetation; warmth generated from renewable electrical energy exceeding grid demand from customers; and waste heat from industrial processes. https://purethermal.co.uk/media-news/pure-thermal-webinar-can-icebat-cold-thermal-energy-storage-provide-an-alternative-cooling-design-option/