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"Illinois courts, therefore, have rejected the argument that the state retains an implied or reserved power to diminish or impair pension benefits."

That’s the beauty of reserved power.

Mr Miliband pledged to clear up confusion over what the Welsh assembly can and cannot do, saying a Labour government would legislate so powers are assumed to be devolved "unless specifically reserved", known as a reserved power model.

On Saturday, Mr Clegg will tell party members: "The Silk Commission challenged all parties to include wording in their manifestos committing to moving to a reserved power model and transferring powers from Westminster to the national assembly on transport, S4C, teachers' pay, sewerage, energy consents, youth justice and policing. "

This year's auction reserved power for 2015-2016, a federal deadline by which coal plant operators must meet environmental rules or shut down.