Concerns about the lack of detail and impact a nuclear power station could have on Anglesey have been raised by the island council's chief executive.
Richard Parry Jones has sent a 10-page letter to Horizon bosses calling for more detailed information about their Wylfa Newydd power plant proposals.
Horizon - a subsidiary of Hitachi which bought the site in 2012 for about £700m - put its plans on show this autumn.
It said it was disappointed by the concerns raised by Anglesey council.
A Horizon spokesperson said: "However this is the beginning, not the end, of the consultation process and this is what the process was designed for."
Mr Jones said the "lack of detail" within the public consultation information is "concerning given the sheer scale of Wylfa Newydd and its potential impacts on Anglesey and its communities".
Councillors agreed that the chief executive send a "frank, but constructive" letter outlining the concerns, including:
- A lack of detail surrounding workforce numbers - essential from a skills, training and education perspective
- A lack of detail on estimated numbers and profiles of employees from outside Anglesey - to gauge the project's impact from a social, community and Welsh language perspective
- A lack of explicit commitment shown to promoting local employment opportunities and local supply chain
- Little or no recognition of potential effects Wylfa Newydd will have on existing jobs, bed spaces, facilities and services
- A need for considerable more work to establish the impacts on Anglesey communities, especially those within a 5km radius of the main site, and how to mitigate them
Horizon Nuclear Power said its proposed power plant will employ more than 1,000 people once it begins working in the first half of the 2020s.
The current Wylfa power station will close in 2015 at the latest, after beginning operation in 1971.
In response to the letter, the Horizon spokesperson said: "We're already planning a series of targeted consultations during the course of 2015 relating to specific aspects of associated development, and we will provide greater detail of our proposals as soon as it's available.
"Horizon is resolute in its commitment to delivering major benefits and minimising the impacts of our project on communities in Anglesey."