Oil prices are likely to remain high, and there is nothing Norway can do to increase supplies because the nation's offshore fields are already producing at full capacity, oil minister Thorhild Widvey said Thursday. "I think oil prices will remain high," she said at a briefing for Oslo-based foreign correspondents. "How high I don't know." Oil prices have been above US$50 a barrel, near record levels, and the International Energy Agency has said demand for energy is expected to increase by 60 percent by 2030, pushed up by increasing consumption in places like China and India. "Energy is going to become more and more important on the international agenda," said Widvey.