Abstract: What is power for and how can it be organized to promote collective flourishing? This chapter seeks to answer that question by examining contemporary theories and historical evidence. Modern theories of positive power emphasize actions but give insufficient attention to the valence of goals that animate them or the outcomes that they produce, despite McClelland’s earlier definition that included shared goals. The proposed theory of positive power specifies terminal values as objectively positive goals and commitments that counter normalized moral menace power to promote collective flourishing. Further, the scope of analysis transcends individual, relational, and organizational power to consider institutions as positive powerhouses of society. A conceptual model illustrates the interdependence of power, institutional integrity, and a moral ecology that is stewarded at all levels of society to serve the common good. An expansive historical case reveals how, even in a degraded moral ecology, positive power was exercised, stewarded, and distributed in the financial sector in ways that enabled collective flourishing at scale, across geography and generations. Findings have implications for institutional and societal renewal.