Instant coffee can be used as a substitute for espresso powder. Generally, it is best to use dark roast instant coffee when using it as an espresso powder substitute. Instant coffee can be exchanged equally with espresso powder in most recipes.
Another ingredient that can be used in place of espresso powder is liquid espresso. Strong, cold coffee can also be used as a substitute for espresso powder in many recipes. When replacing powdered espresso with a liquid, decrease the other liquids in the recipe accordingly. Finely ground coffee beans is another ingredient that can be used in place of espresso powder.