As an expert sommelier and brewer, I can tell you that kegs of beer can indeed go bad if not refrigerated properly. Beer is a delicate beverage that requires specific temperature conditions to maintain its quality and prevent spoilage.
When beer is stored at room temperature, which is typically around 68-72 degrees Fahrenheit (20-22 degrees Celsius), there is a risk of bacteria formation. Bacteria can thrive in this temperature range and can quickly spoil the beer, resulting in off-flavors and unpleasant aromas. This can significantly affect the taste and overall enjoyment of the beer.
It is important to note that different beers may have different temperature requirements for optimal storage. However, as a general rule, most beers should be kept below 50 degrees Fahrenheit (10 degrees Celsius) to prevent bacterial growth. This temperature range helps to inhibit the growth of harmful microorganisms that can spoil the beer.
On the other hand, it is also important to avoid keeping beer at excessively cold temperatures. Beer, being a liquid, can freeze if exposed to temperatures below its freezing point, which is typically around 28 degrees Fahrenheit (-2 degrees Celsius), although this can vary depending on the alcohol content of the beer. Freezing can damage the beer's flavor and texture, leading to a less enjoyable drinking experience.
Finding the right balance is crucial when it comes to storing kegs of beer. Ideally, beer should be stored in a refrigerated environment specifically designed for beer storage, such as a kegerator or a beer cooler. These appliances are equipped with temperature controls that allow you to set the ideal storage temperature for your beer. This way, you can ensure that your kegs are kept at the optimal temperature range to maintain their quality and freshness.
In my personal experience, I have encountered instances where beer was not properly refrigerated, resulting in spoiled batches. The off-flavors and unpleasant aromas that develop in such situations can be quite noticeable and can make the beer undrinkable. This is especially true for more delicate beer styles, such as light lagers or hop-forward IPAs, where any off-flavors can be particularly pronounced.
To summarize, kegs of beer can go bad if not refrigerated properly. Room temperature storage can lead to bacterial growth and spoilage, while excessively cold temperatures can cause freezing and damage the beer's quality. It is important to store kegs in a refrigerated environment at the appropriate temperature range to maintain their freshness and prevent any potential off-flavors or spoilage.