People living near the proposed development at Moorsyde, south west of Berwick, said the proposal would have a severe adverse impact on the landscape.
Berwick Borough Council is considering plans for seven turbines at Moorsyde, six at Barmoor, between Ford and Lowick, and seven at Toft Hill, south west of Grindon.
More than 300 people are attending the meeting at the Maltings, Berwick.
Members have this morning heard about the Moorsyde scheme and this afternoon will hear about the Barmoor and Toft Hill plans.
Mike Maud, chairman of Moorsyde Action Group, said: "Please refuse this proposal on a range of planning grounds available and doing so send a clear message to other would-be developers that purely designed, purely located, purely scaled and purely evidenced applications will not be tolerated.
Rod Martin, chairman of Shoreswood Parish Council, said: "We fear and believe that wind farms are like cancer cells, once established they spread – turbine tumours. These proposed turbines are colossal, they defy the skyline and seven of them are too many. We pray you will reject these proposals.
However three supporters spoke in favour of the scheme on the grounds that it would offset climate change.
Richard Mardon, managing director of applicant Your Energy, said the scheme would provide power for 7,000 households, 60 per cent of the borough.
He said: "Today could be a great day for Northumberland, a great day for Berwick borough and a great day for the world.
"Today this council can vote to be self-sufficient in renewable energy and stand head and shoulders above most other councils in the country. Today councillors can vote to displace 14,000 tonnes of carbon dioxide from entering the atmosphere every year."
A decision is expected on the three applications later today.