When our energy department ran this calc Solar was far cheaper but the actual costs were nearly 10x using LPG because a grid needed storage and diversification to account for the different outputs. If the sun is low you cant run a country of batteries and still have it match LPG.

This image shows Solar at a best case comparison and not the times when its producing 20% of LPG

Related: Australians will get 3 hours of free electricity in the middle of the day because we have so much extra solar capacity that isn't being used