A power delivery rate from a renewable power source (120, 620, 720) to a load (160) is managed by determining, by processing circuitry (200), a change in a power generation rate, determining, by the processing circuitry, whether the change in the power generation rate exceeds a limit (510, 520), and then, adjusting, by control circuitry (330), a power transfer rate to or from a power storage device (230), such that the adjusting is sufficient to prevent the power delivery rate from exceeding the limit (510, 520).