A transmission arrangement for transmitting power from a power source to an electrical generator. The transmission arrangement comprises a continuously variable transmission (CVT) and an alternative transmission that is more efficient at transmitting power than the CVT. The transmission arrangement further comprises a power mixing mechanism for combining power from the CVT and the alternative transmission into a combined power output to be provided to the electrical generator. The percentage of CVT power within the combined power output decreases as the power supplied by the power source increases.