Renewables and grid integration: The energy storage approach

Renewables and grid integration: The energy storage approach

According to a recent report by Deutsche Bank, solar electricity will reach grid parity in 36 states by 2016, indicating a trend that renewable energy is becoming increasingly available at decreased costs to install. As a result, utilities are considering multiple strategies to integrate renewable energy sources on the grid and accommodate additional distributed energy. Utilities in certain areas of the country, such as Hawaii, are leading the initiative to capitalize on lower costs of high solar penetration, but there remains a great deal of speculation in the industry about the best technological path, and many players are waiting to see the longer term financial viability of renewable energy before committing to its integration.

Facing the challenges of integration

While this trend in harvesting renewable energy sources may benefit both consumers and utilities economically in the long run, there are still challenges to integrate them on a utility and commercial scale today. There are currently three main considerations and hurdles to successful integration of renewable energy on the grid:

Location, location, location

Within utility networks, the value of distributed energy resources, such as solar PV, is dependent on where the resource is located on the feeder line. An increased number of transmission studies and scenario models are necessary to ensure that resources are installed in optimal locations to reap the most benefits.

Power quality and continuity

Natural elements, such as clouds covering solar panels, weak winds or extreme storms, can cause intermittencies in service that leave utilities scrambling to restore a constant flow of power as they switch to backup power sources. While brownouts can last mere seconds or longer, depending on the severity of the weather, dips in power negatively impact utilities service and reliability.

Policy

Policymakers need to further facilitate the integration of renewables and specifically foster utilities exploration and analysis of a wide array of technologies from both a cost and performance perspective. The result of this will be a toolbox of product types to select from that will economically meet specific project needs and issues.

Energy storage solutions

Deployment of energy storage technology is a part of the solution, and can remedy certain issues by storing energy captured from renewables for later use. While batteries are often the energy storage technology of choice, repetitive cycling at high voltage erodes performance capabilities, causing these devices to have a short life span, which results in higher long-term maintenance and replacement costs.

Source: SmartGridNews

SMART GRID Bulletin May 2017


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