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New England Electric Grid operates on precautionary alert

On Tuesday, the electric grid in Boston and its surrounding area was on precautionary alert as it was anticipated that the surplus power would narrow to a razor's edge due to the high temperatures.

ISO New England, which operates the electric grid for six states, started operating on a precautionary basis late Monday, as the energy supply tightened.

The wholesale electricity prices in the last 24 hours indicate a tightening of supplies. The grid reported nearly $430 per Megawatt Hour (MWh), which is a tenfold increase compared to prices when the system was not stressed.

In order to prepare for the scorching heat of Tuesday, the grid instructed power plant operators to refrain from any testing or maintenance which could affect electric reliability.

New England has adopted the same strategies as other grids in the east half of the United States to balance supply and demand for electricity. They also asked power plant operators to postpone maintenance and increased imports from neighboring regions.

According to the National Weather Service, temperatures in Boston will reach 100 degrees Fahrenheit on Tuesday afternoon.

ISO New England predicted that the electricity demand late Tuesday would reach 26,000 megawatts. This is short of August 2006's record of 28,130 megawatts.

ISO New England forecasted that electricity demand would reach 24,803MW in normal weather conditions and 25,886MW during periods of weather above average, like a prolonged heat wave.

According to the latest forecast, demand will peak at 25,800MW on Tuesday evening. The surplus capacity was predicted to drop to 266MW, which is a significant decrease from the typical margins of several thousand megawatts in more temperate weather.

(source: Reuters)