As an expert sommelier and brewer, I can confidently say that coffee porter, or coffee beer, does contain caffeine, although the amount is typically quite low. When brewing coffee beer, most brewers prioritize the beer aspect, so they use a higher ratio of beer to coffee. This means that the caffeine content in coffee beer is significantly lower compared to a regular cup of coffee.
To give you an idea of the ratio, a typical brewer might use a 31-gallon barrel of beer with only one pound of coffee beans for extraction. This results in a relatively small amount of caffeine being infused into the beer during the brewing process.
It's worth noting that the caffeine content can vary depending on the specific coffee beans used and the brewing techniques employed by the brewer. Different coffee varieties and brewing methods can yield varying levels of caffeine extraction.
In my personal experience, I've found that coffee beer provides a subtle hint of coffee flavor and aroma, without the strong caffeine kick you might expect from a cup of coffee. The focus is more on the rich, roasted flavors that the coffee imparts to the beer, rather than its caffeine content.
It's important to keep in mind that if you're particularly sensitive to caffeine or trying to avoid it altogether, even the small amount present in coffee beer may have some effect. However, for most individuals, the caffeine content in coffee beer is unlikely to have a significant impact.
Coffee porter or coffee beer does contain caffeine, but in very low amounts. The focus of brewing coffee beer is primarily on the beer itself, with the coffee serving to enhance the flavor profile rather than providing a substantial caffeine boost.