Inefficiency doesn't matter if you are storing curtailed energy. If it makes more financial sense and uses less resources to overbuild solar 3x and curtail 60%

Inefficiency doesn't matter if you are storing curtailed energy. If it makes more financial sense and uses less resources to overbuild solar 3x and curtail 60% of the energy than paying for fuel, then you have 2 units of energy you have already paid for spread out over 6-8hrs/day. As long as using your $300/kw electrolyser at reduced duty cycle is cheaper and less resource intensive than mining and shipping gas, you do it.