validation, since it compared storage temperature and shelf life in different countries and found that shelf life was 44% longer for Norwegian milk stored at 4◦C than for Swedish milk stored at 8◦C, which corresponds well to the 41%difference used in this study. The most extreme shelf life addition in this study (95% for deli products reduced from 8◦C to 2◦C, 44%when reduced from 8◦C to 4◦C) was smaller than that found by Møller et al. (2014) for cooked ham packed in a modified atmosphere, which had 90% longer shelf life in Norwegian 4◦C storage than in Swedish 8◦C storage, and warm smoked ham, which had a corresponding 50% longer shelf life. Increased energy demand for reducing the storage temperature was based on slightly modified calculations originally from a study on domestic refrigerators. This also introduced a potential bias , as did the assumptions regarding electricity cost and green-house gas emissions associated with electricity generation. All of these assumptions combined create an uncertainty that if multiplied could have a large impact on the results, but since there are no other similar studies to verify the results, this risk cannot be completely eliminated. However, our results were in line with predictions and calculations on other waste-reducing measures(Eriksson and Strid, 2013), and are thus useful as an indicator of the potential for reducing food waste by reducing storage temperature, or using other techniques to prolong shelf life. Although the results included some uncertainties, they revealed that, as expected, waste decreases with increased shelf life and that decreased storage temperature leads to increased energy demand. The most interesting finding was therefore the net cost or benefit of reducing storage temperature. The largest net saving (both in SEK and kg CO2e) was found in the meat department, which has products with comparatively large relative waste and high valueper unit mass. The products also have relatively short shelf life, which could be one of the reasons for the already lower storage temperature. In addition, the meat department in the supermarkets studied had the smallest minimum order size, which indicates that these supermarkets have already identified this department as a potential target for waste reduction measures. However, our results show that there is further potential to reduce waste in the meatdepartment. The deli department also has a large number of products with a comparatively low average turnover, which makes them more adaptable to a change in shelf life in terms of waste reduction(Eriksson, 2012; Eriksson et al., 2014). This, in combination