System and method for providing power grid energy from a battery

A system (10) for providing energy and other ancillary services to a power grid (26) including a renewable energy source (16). One or more power converters (28, 35,36) are integrated with the renewable energy source (16). A battery-based energy storage system (12) is also integrated with the renewable energy source. A control system (20) including an algorithmic software operates to control at least one power converter (28,35,36) together with the battery-based energy storage system (12) to supply stored battery energy to the grid (26) when the cost of extracting the stored battery energy supplied to the grid (26) via the battery-based energy storage system (12) is less than the market price paid for the stored energy supplied by the battery-based energy storage system (12).