By Tassilo Hummel and Leigh Thomas PARIS (Reuters) -France will cap power and gas price increases for households at 15% next year, Prime Minister Elisabeth Borne said on Wednesday, to ease the pain of Europe’s worst energy crisis in decades on consumers. The caps will cost the state 16 billion euros ($16 billion) and prevent household bills from more than doubling. The state will also persist with grants for the poorest, with a cheque of up to 200 euros for 12 million households. Borne said the new cap on gas prices would take effect in January, while the new electricity cap would follow a mon…