Many things about this piece of literature are hard to understand.

Which revision would make this sentence more precise?

Change "are" to "is"

Explanation:

Renewable energy in Nepal comes from hydropower, solar energy, biomass, biogas, and wind energy. Nepal installed hydropower capacity is at 1,016 megawatts (MW), providing most of the country's grid-connected electricity generation. The potential for economically viable hydropower in Nepal is estimated at 40,000 MW.