This paper engages Rainer Forst's doctrine of noumenal power. At the centre of this doctrine is its signature claim that power is noumenal in nature. I reconstruct Forst's definition of power and distinguish three conceptions of noumenal power in his writings. I argue that, on each conception, we should reject that claim. It emerges that the professed noumenality of power is either a trivial feature of power, or else a feature only of some forms of power. Consequently, Forst's definition of power cannot be adequate and the claim that power is noumenal in nature is either trivial or false.