Lidl, Hugo Boss, Aldi, and other retailers told Insider what they've done in stores to save power.
Switching off illuminated logos for 18 hours and keeping doors shut are just some of the plans.
Many retailers, including supermarkets and clothes outlets, use large amounts of energy with their lighting inside and outside, illuminated advertising, heating, and air conditioning.
"We do take the current situation very seriously," a spokesperson from Aldi Süd, the German grocery store tied with Aldi Nord, told Insider.
"Examples of initiatives we are taking to improve energy efficiency include switching to LED lighting, upgrading building management systems, improving insulation and using energy recovery from heating and cooling," an Ingka spokesperson told Insider.