The signs don't look good.
Dr Edward Jones, economics lecturer at Bangor University, had said that he did not think that the Japanese giant would walk away - it has already invested £2bn in the Wylfa Newydd nuclear power plant.
But today he tells Wake Up to Money: "It certainly is a difficult situation. We would hope the project continues in some form or another at a later date, given the impact it would have on both the local economy and the country as a whole."
Why is this happening?
Patricia Schouker, an energy analyst and associate member of New College at Oxford University, cites Japan's Prime Minister Shinzo Abe who, when meeting the UK's Theresa May recently, said that the legal stability post-Brexit is something the country needs to pay attention to.
"So, in real estate we say 'location, location' but in energy, we say 'footnotes, footnotes'."