Power come from

Power is the ability to act.
=> Formal authority
=> Control over scarce resources
=> Use of organizational structure, rules and regulation
=> Control decision process
=> Control of knowledge & information
=> Control of boundaries
=> Ability to cope with uncertainty
=> Control of technology
=> Interpersonal alliances, networks, and control of informal organizations
=> Control of counter organizations
=> Symbolism & the management of meaning
=> Structural factors that define the stage of action
=> The power that one already has

Reference:
Management decisions for engineers by James Parkin p.16-18