During the post-1990 period, negative peace (the absence of armed violence) appeared to have taken a holiday in the Niger Delta of Nigeria. The insurgency in the Niger Delta has experienced a free fall, mutating and escalating almost uninterrupted. Mainstream analyses of the causes and duration of insurgency in the Niger Delta tend to focus on the deprived actor (frustration and aggression) and rational actor (greed and opportunity) paradigms. Less attention has been paid to the role of state capacity in the onset and duration of insurgency in the Niger Delta. Indeed, the specific relationship between state capacity and the onset and duration of the insurgency, especially in the Niger Delta of Nigeria, is yet to receive brawny scholarly attention. This paper attempts to remedy this shortcoming. Building upon well-established theoretical and empirical literature on state capacity, the paper examines the effect of state capacity on the insurgency in the Niger Delta since the 1990s. The paper argues that the manifestation and duration of insurgency in the Niger Delta of Nigeria is a reflection of a feeble state capacity. State capacity significantly explains the willingness to participate in, and the shelf life of, the insurgency in the Niger Delta of Nigeria. To this end, the cause of and cure for the insurgency in the Niger Delta rests on a robust state capacity which the Nigerian state lacks.