This is a political thing. Norway produces and consumes near 100% renewable energies. They only sell other people certificates so that they can feel better. Many trains in Germany run on "renewable" energy, and nearly every utility company offers cheap renewable tariffs. In reality it's just certificates they bought from Norway.
That doesn't change anything for Norway though, it only shows that the current European energy policy can easily be abused. The case remains that Norway can easily add more renewable production and use that to grow vegetables in containers (ideally adapted so that they can cope with fluctuating supply). Norway has so much potential that they can still export more energy towards Europe, but as Denmark has the same plans, running significantly more wires towards southern Germany is the main problem here, not some certificates.
That doesn't change anything for Norway though, it only shows that the current European energy policy can easily be abused. The case remains that Norway can easily add more renewable production and use that to grow vegetables in containers (ideally adapted so that they can cope with fluctuating supply). Norway has so much potential that they can still export more energy towards Europe, but as Denmark has the same plans, running significantly more wires towards southern Germany is the main problem here, not some certificates.