Centralized vs Decentralized Storage for Solar and Wind Projects
As global demand for green energy continues to grow, with renewables on track to meet over 90 percent of global electricity demand growth by 2030, investments in solar and wind projects are increasing, equating to annual investments of about $500 billion and $180 billion respectively.
With more than 8,650 planned or active solar projects and 760 planned wind farms registered across the US, interest in the practical optimization of renewable energy projects is also rising.
To help energy developers, independent power producers and plant operators to enhance key operations, meet energy demands and strengthen core investments, optimal energy storage strategies and infrastructure must be created and implemented across contemporary projects.
With this in mind, the below post considers the pros and cons of centralized vs decentralized storage for solar and wind projects, including when each type of solution is most appropriate.
Key Selection Criteria for Centralized vs Decentralized Storage
There are pros and cons to both centralized and decentralized storage solutions, with each type of energy infrastructure well-suited to specific kinds of modern solar and wind projects.
Centralized solutions can help to maximize grid stability and safeguard operators against the costly bottlenecks associated with smaller-scale, distributed systems; decentralized solutions can help to minimize transmission losses and enhance grid resilience by storing power locally.
For operators of solar and wind projects looking to identify appropriate types of infrastructure for their facilities, consider the below selection criteria for centralized vs decentralized storage.
Centralized storage can provide cost-efficiency benefits to large-scale facilities through lower installation costs and streamlined maintenance. However, without backup local storage, faults can cause power loss across supplies which can be hard to address swiftly if sites are remote.
Decentralized storage infrastructure can be costly and time-consuming to develop as multiple sets of batteries and protective physical security hardware must be installed across the supply line, though are less vulnerable to power loss as energy is stored far closer to where it’s used.
Centralized storage can help to streamline power management operations as, once generated and stored, energy can be dispatched to the transmission grid in bulk, the downside being that this requires extensive high-voltage infrastructure which may be inappropriate for smaller sites.
When leveraging decentralized storage solutions, site operators can minimize the impacts of long-distance transmission loss as energy is generated, stored and consumed locally. Though as most grids are designed for one-way power flow, managing multiple outputs can be difficult.
The major benefits of centralized systems concern streamlined management and the ability to meet high volume demands by way of storing large amounts of energy in one place. However, this can reduce the resilience of the grid as power will be lost if the main transmission line fails.
Decentralized storage solutions greatly improve resilience for energy consumers directly linked to localized infrastructure, as even if the wider grid fails, stored power will be accessible. This benefit may be limited, however, as smaller batteries may not be able to cover longer outages.
By design, centralized storage systems are far easier to control and integrate into wider power infrastructure as all energy is distributed from a single source. Provided operators can fund the initial installation, centralized systems stand as easily-managed, predictable storage solutions.
Control and integration can be much more complicated with regard to decentralized solutions, as large volumes of independent hardware and software components must be joined together and integrated, typically requiring advanced tools to aggregate units into Virtual Power Plants.
Developing Future-Forward Energy Infrastructure
Both centralized and decentralized storage solutions can provide benefits to different types of solar and wind projects. Generally speaking, large-scale, grid-connected, commercial facilities stand to benefit most from centralized solutions, while installations built to serve residential prosumers and localized microgrids are best-suited to decentralized energy storage solutions.
For more complex operations, hybrid solutions can help operators to leverage some benefits of both centralized and decentralized systems, e.g. the deployment of a centralized Battery Energy Storage System at the substations feeding into decentralized batteries at output points.
As demand for renewable energy continues to rise, so too will the importance of identifying the right type of storage infrastructure to best-meets long-term needs. Whether via centralized, decentralized or hybrid systems, facility operators must approach plans with longevity in mind.
Sean Toohey is a freelance journalist and digital media specialist with extensive experience covering news, developments and emerging trends in the commercial security industry. Currently focused on security technologies and data privacy, Sean’s work explores the adoption and impact of smart technologies like AI, the IoT and cloud computing on modern industries.
