Assess solar + storage’s value in terms of facility resilience

solar power resilience

The National Renewable Energy Laboratory (NREL) updated its publicly available online solar+storage optimization tool, REopt Lite, which can be used to determine the sizing of resilient power technologies designed to support critical services. Recent disasters in places such as Puerto Rico, where widespread outages contributed to devastating loss of life, underscore how important it is to give building owners and emergency planners straightforward tools to evaluate how to make buildings more resilient with solar and battery storage.

“The updated version of REopt Lite marks a big step in the evolution of solar+storage analysis,” said Clean Energy Group Vice President Seth Mullendore. “It will help many of the organizations we work with every day – affordable housing developers, critical facilities managers, municipalities, and community groups – better understand the potential economic and resilience benefits that solar+storage could bring to their buildings, without having to rely solely on industry representatives and expensive consultants.”

Valuing resiliency

The majority of customer-sited solar+storage installations are designed to meet one of two goals: either to reduce electricity expenses or to increase energy resilience. Cost savings are a key concern for building owners and managers, which is why the economic benefits of solar+storage have made these projects increasingly popular for businesses, schools, nonprofits, and other entities facing significant demand-related charges on their electric bills.

In addition to reducing demand charges and time-of-use energy rates, solar+storage systems also deliver value by providing power to buildings when the grid goes down, whether by allowing a business to stay open or residents to shelter in place; or, in the case of facilities like medical clinics and emergency shelters, potentially preventing loss of life. The economic and social costs incurred due to increasingly more frequent and longer-duration power outages can be avoided with properly designed resilient solar+storage systems.

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With REopt Lite’s newly expanded functionality, users of the tool will be able to compare and contrast economic and resilience goals in a publicly available, easy-to to-use interface. By giving users the ability to assign and adjust a value for resilience benefits and view a side-by-side comparison between resilient system sizing and costs and a system designed to maximize savings, the new version of REopt Lite will help decision-makers identify potential cost gaps and balance what may at times be competing priorities.

“While we have historically measured the benefits of solar+storage in terms of cost and energy savings, resilience is emerging as another critical value,” said Kate Anderson, senior engineer and manager of the Engineering and Modeling Group at NREL. “REopt Lite’s new expanded resilience capability allows users to compare systems designed for maximum economic benefit to systems designed to sustain critical loads during grid outages, and assess the cost-benefit tradeoffs of different options. It also allows users to consider how varying microgrid upgrade costs and avoided outage costs may impact the economics of their system. We hope this will be a useful tool for decision-makers who are considering resilient solar+storage systems.”

Clean Energy Group is also offering free REopt Lite training sessions and analysis support to nonprofit organizations interested in using the tool to evaluate solar+storage projects that would benefit disadvantaged communities. These enhanced resilient design capabilities were developed in collaboration with Clean Energy Group through its Resilient Power Project and supported with funding from The Kresge Foundation and the Department of Energy’s Federal Energy Management Program and Solar Energy Technologies Office.

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