ISO New England Forecasts the Impact of Energy Efficiency and Rooftop Solar on Demand

Energy efficiency, rooftop solar to trim New England power use, draft report says

Krysti Shallenberger, Utility Dive, April 3, 2018

Dive Brief:

  • ISO New England released a draft of its 10-year forecast saying increasing amounts of energy efficiency and rooftop solar will trim power usage and peak demand over the coming decade.
  • The draft report said that without the growth of efficiency and solar, the region will likely see a compound annual growth rate of energy usage by 0.9%, or 142,488 GWh in 2018 to 154,364 GWh in 2027. But after factoring in efficiency and solar, the grid operator estimates that net energy usage will drop 0.9%.
  • For peak demand, the draft report estimates summer peak demand will rise in a compound annual growth rate of 0.8% without the mitigation of efficiency and solar. But again, once those are factored in, summer peak demand is projected to fall by roughly 0.4%.

Dive Insight:

New England is projecting a dip in summer peak demand and energy usage as efficiency measures and solar proliferates. This doesn’t come as a surprise, given the region’s ambitious goals to meet energy needs with increasing amounts of renewable energy.

The draft report also aligns with a national trend of stagnant, even declining demand due to efficiency measures in particular.

New England is facing other challenges apart from a dip in peak demand and energy usage: possible impacts to reliability due to increasing reliance on natural gas and a lack of infrastructure. The grid operator released a study last winter noting that the region’s growing dependence of natural gas could hurt its attempts to decarbonize.

The study outlined nearly two dozen scenarios that included winter-long outages at four major energy facilities along with several other variables. The report concluded all but four scenarios result in fuel shortages requiring rolling blackouts. More renewable energy could lessen the fuel security risk, the study noted, but would also force coal and oil-fired generation retirements, boosting the need for liquified natural gas imports.

In January, the region faced issues when the Pilgrim nuclear plant went offline unexpectedly, causing localized reliability issues. In response, the region ramped up its oil-fired plants and imports from New York to compensate for the loss of power.

These events spurred Federal Energy Regulation Commissioner Robert Powelson to voice concerns over the future of reliability in the region. He told Utility Dive that the lack of infrastructure in the region could hurt its ability to meet clean energy goals while retaining reliable service. FERC had also recently approved a proposal by the ISO to split its capacity market auctions into two parts in order to better compensate subsidized resources. Powelson dissented in the 3-2 vote, noting the ISO’s approach could hurt the market’s ability to ensure that the least-cost capacity resources could respond when necessary.

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