It’s increasingly expensive for utility companies to generate power. The cost of fuel is raising the utilities’ operational costs, and demand on the grid is growing rapidly, despite new advances in energy-efficient appliances.
Additionally, infrastructure investment costs (what it takes to maintain the grid), are forecasted to be around $14 billion dollars a year in the near future. All of these associated costs get passed on to you the consumer.
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http://www.sungevity.com/rising-electricity-rates