The source I am remembering is specifically about catering, not restaurants per se:
The energy used in catering facilities typically accounts for 4-6% of operating costs. Many caterers work on a profit margin that is within this range, so it is obvious that saving energy can directly increase revenue and profitability without the need to increase sales.
The energy used in catering facilities typically accounts for 4-6% of operating costs. Many caterers work on a profit margin that is within this range, so it is obvious that saving energy can directly increase revenue and profitability without the need to increase sales.
https://www.carbontrust.com/media/138492/j7895_ctv066_food_p...