"If we're going to have cleaner energy, a more secure energy, it's not going to come without paying a price," Jeremy Nicholson, of the Energy Intensive Users Group, told Daybreak.
"The one thing we are guaranteed out of this," he went on, " we're going to get secure energy, and that's worth something."
But the Green Party's Baroness Jones said the Hinkley deal was "a disastrous decision".
"At the moment we don't know what to do with the nuclear waste and that means we are giving our children and our grandchildren a huge cost to pick up cleaning up after we've finished with this energy."
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Deputy Prime Minister Nick Clegg launched his election battlebus today with an attack on the Conservative Party.
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David Cameron will stand down as Conservative leader ahead of the general election expected in 2020, Iain Duncan Smith said.