Other options for filling the energy gap would include making greater use of the large number of small generators that the National Grid can call on in time of shortage, and extending the use of contracts that allow the grid to interrupt supply to industrial customers at peak periods.

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In 2010, a small number of very large electric power generators accounted for roughly one third of all natural gas delivered to consumers.

FORBES: The Gluttons of Natural Gas

There are similar suspicions about a recent decree limiting the number of consumers that can leave the pool and negotiate directly with generators.

ECONOMIST: Electric power in Brazil