You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "as a region which part of the us produces the most hydropower?" whose answer is Columbia River basin.
Each document should contain about 30 words, and these documents should contain useful information.

Query: regions with the most hydropower production in the United States
Useful Output:

Doc 1: Figure 38 shows that the largest hydropower-producing region in the United States is the Northwest. With an installed capacity of 35.9 GW in
Doc 2: Hydroelectric-power production in the United States and the world. This chart shows hydroelectric power generation in 2012 for the leading
Doc 3: Fortunately, most hydropower in the Western United States is generated outside of this region and very few hydroelectric plants face the same unique
Doc 4: It can generate around 83,000 megawatt-hours of electricity annually across 59 dams, primarily in Washington, Oregon and Idaho. The Grand Coulee
Doc 5: States that produce large amounts of hydro energy in the country are Washington, California, New York, Oregon, and Alabama.