The potential developer, Western Power Distribution Investments Ltd, says it has no comment to make in response to the Welsh Government's dismissal of its appeal.
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The Welsh Government will later launch new plans to reduce the number of children living in poverty in Wales.
Plaid Cymru are to launch their campaign this morning ahead of May's general election.
A study by Swansea University has found a fifth of students in the UK have considered working in the sex industry to fund their studies.