They contacted watchdogs, including energy regulator Ofgem and water regulator Ofwat, before Christmas asking them to submit proposals by mid-January.
This comes after figures published earlier this week indicated the UK economy had flatlined between July and September.
Shadow business secretary Andrew Griffith said the letter “says all you need to know” about Sir Keir’s government, claiming he has to “beg his own government to create growth after Labour’s damaging Budget”.