if they sell at the local rates of ~14cents a kwh (24 in the winter) they aren't making any money by selling power to the locals because its really 14-24cents kwh for offshore wind, there is no profit margin there.
$0.14 per kWh has little to do with it. They are saving money because they can shut down the expensive ($0.40 to $0.50 per kWh) diesel generators that is their only current generating source. The cost of the wind power generated is well below that regardless of connecting to the mainland or not. Also, they plan to sell excess wind power to the mainland through the cable - that's wind power that would be wasted otherwise, so even at a losing rate of "~14cents a kWh", it's a gain to bottom line (assuming the cable is going to be there, anyway). If the cable to the mainland was the only valuable part of this, why wouldn't someone have financed the cable without the wind power?