Plaid Cymru leader Leanne Wood insists her plan for a not-for-profit company to take on the big energy firms is fully costed and would be cheap to set up.
She unveiled a raft of policy ideas at the party's annual conference in Aberystwyth.
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The Welsh Assembly election is less than a week away and the treatment and care of cancer is one of the more contested issues.
Tributes have been paid to an ambulance driver killed in a crash with another ambulance in North Wales.
Tonight is expected to be clear and dry - though some parts of Wales will experience frost.