Very similar (though he does not cite Foucault) is Warren J. Samuels's idea of "social power" as the ability to effect choices (choose among perceived alternatives and take action to bring that choice to fruition). ["Welfare Economics, Property, and Power," in Perspectives of Property]

I thought this author might find it interesting that power perceived that way can actually lead to an ethic of justice: a rule of conduct for governing the governance of society (because human beings have no choice but to effect choices). Justice is always about putting constraints on power. The primacy of liberty in Liberalism is the antithesis of constraining our power.