1. A method for determining a generator dispatch plan for a power grid under uncertain conditions comprising: receiving data modeling power flow of active generation units over nodes of a power grid network of multiple local buses interconnected via transmission lines, said active generation units including conventional energy generators producing energy; receiving during a first time interval data of a set of forecast scenario modeling uncertainty in renewable energy output, said set capturing a finite number of scenarios generation for an immediately successive 2 nd time interval; formulating an optimization problem modeling economic dispatch problem under renewable-generation uncertainty; solving optimization problem during said first time interval to obtain power dispatch levels for said generators and energy levels exchanging with a spot market for each scenario at said 2 nd time interval that minimizes expected cost of power generation and cost of exchanging energy with a spot market modeled for each said modeled uncertainty, wherein one or more processor units in communication with a memory storage device performs said receiving said modeling power flow and uncertainty data, said formulating and solving.