Trump's comments about hydropower came after a reporter asked him about his decision to pull the US from Paris Climate Accord last summer, claiming it was unfair to the country.
However the remarks came on the same day that Mr Trump dismissed the importance of renewable energy and said he was a "massive" supporter of oil.
In joint press conference with Prime Minister Erna Solberg, President Trump encourages Norway to spend 2 percent of its GDP on defense as outlined by North Atlantic Treaty Organisation guidelines.
"It treated the United States very unfairly", Trump said of the deal. It put great penalties on us.
Analysts have said the USA withdrawal from the Paris agreement makes it more hard for the world to reach the goals that it set for itself in the Paris agreement. "It took away a lot of our asset values", he said of the pact that includes every other nation in the United Nations. But we will start to negotiate, and we will see if we can make a deal that's fair.
The Paris agreement's central aim is to strengthen the global response to the threat of climate change by keeping the global temperature rise in this century well below 2 degree Celsius above pre-industrial levels and to pursue efforts to limit it to 1.5 degree Celsius.More news: Align Technology (NASDAQ:ALGN) Upgraded to "Buy" at Credit Suisse Group
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Trump has called climate change a "hoax" in the past - one perpetrated by the Chinese. Seated in the Oval Office, Trump notes that Norway has been a strong consumer of USA -built military equipment, including the F-35 aircraft. "According to some estimates, we would have had to close businesses in order to qualify by 2025".
Trump insisted that his administration feels very strongly about the environment.
Under Trump, the USA has made successive roll-backs on environmental protections, scrapping the Clean Power Plan, which sought to inch the US away from its use of coal-burning energy, and opening previously protected lands up to mineral exploration.
"The Paris Accord really would have taken away our competitive edge, and we're not going to let that happen".
"I'm not going to let that happen", he added.