Transmission congestion drives power price division between upstate and downstate New York

(Mon, 26 Sep 2011) Electric power usually costs more in New York City, Long Island, and the Hudson Valley than in the rest of New York due to transmission constraints on moving power into the New York City area. The chart below, published by the Federal Energy Regulatory Commission, shows a typical example of diverging prices for those regions in the day—ahead market.
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Wholesale power price maps reflect real-time constraints on transmission of electricity

(Tue, 20 Sep 2011) Wholesale electricity prices change throughout the day and night, depending on many factors including the level of demand for electricity and the varying costs of generating power from different types of generators. Wholesale electricity price maps are a useful resource for visualizing location-specific prices and transmission constraints in real time.
EIA: What’s New