An enclosure is provided which is mountable to a base frame carrying a generator. The enclosure includes a lower portion connectable to the base frame. The lower portion includes a lower first sidewall, a lower second sidewall, and a lower first end wall and a lower second end wall. The enclosure further includes an upper portion having a roof, an upper first sidewall, an upper second sidewall, and an upper end wall depending downwardly from the roof. The lower portion and the upper portion are hingedly connected together such that the upper portion is pivotable relative to the lower portion between closed and open positions.