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Utility Scale Energy Storage Solutions

NRI recently announced the development of its commercial and utility scale battery energy storage systems/distributed energy storage (DES) units with our large models ranging from .5MWh upwards to 20MWh.

These large scale BESS/DES units are designed in a modular fashion and are capable of performing specific stand-alone modes of operation or may be programmed to perform multiple modes of operation on a scheduled or signaled basis customized to the utility’s needs. NRI’s recent advances in the areas of utility revenue stacking enables us to work with our utility customers in the development of an operating model which not only serves their on-site power needs, but also takes advantage of potential revenue streams to assist in offsetting operating costs.

NRI BESS-DES solutions are designed to operate in a wide range of charge and discharge modes and through different battery chemistries, inverter combinations, and software controls the final design will reflect the goals your organization is trying to achieve. Whether your organization is concerned with power quality, peak load reduction, arbitrage, or deploying storage to avoid expensive infrastructure upgrades elsewhere, we’re here to model a solution just for you. The skilled engineering staff at NRI also designs and installs customized system enclosures for our clients needing to integrate their BESS/DES units into a more visually appealing structure.

Lastly, NRI recognizes that utility energy storage does not mean simply large-scale units. We believe energy storage deployed at the residential and commercial level still can have a benefit to the utility. Through the custom NRI Hive Mode of Operation available on NRI residential and commercial BESS units, we’re able to assist the utility in using multiple small storage devices across the local grid to perform a wide variety of functions. When speaking with NRI representatives, be certain to inquire about Hive Mode and how it may be beneficial to your firm.
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Energy Storage – NRI’s Financial Engineering Approach

As the world’s utilities struggle to integrate higher and higher percentages of renewable energy into their generation portfolios through cultural and regulatory pressures, NRI launched its utility scale storage to assist. With over 35 years of engineering experience in the energy storage industry and with a broad range of environmental experience NRI pledges to retain our high standards for system quality while delivering a solution that satisfies the financial goals of our customer base. NRI, having worked around the globe on storage projects, understands that no cookie-cutter model will satisfy the unique environment in which your utility operates. Local grid attributes, financial and regulatory constraints differ amongst the utility clients we have in different regions. In response, NRI has designed its energy storage systems around basic modes of operation allowing us to provide every utility its own unique profile. We’ve determined that our revenue stacking model when used in conjunction with the utility’s forecasting based on historical data is the most effective solution at identifying how to structure the BESS/DES operations. We’ve also recognized that historical data is not enough when dealing with systems over years of service in an ever-changing market environment. NRI has therefore integrated into its annual maintenance program an annual financial model review option for our utility clients to reconfigure the BESS/DES operation based upon new data inputs each year.

Benefits of NRI Energy Storage Systems


    Energy Arbitrage takes advantage of either predetermined time of day price fluctuations or signal indicated (from SCADA data) price fluctuations to charge and discharge the BESS/DES at a specific rate for a specific amount of time. Arbitrage is the most common mode of operation activated on the NRI energy storage system, generally in combination with additional benefits.

    Peak shaving charges and discharges the BESS/DES based upon a specific load profile provided by the end-user and is commonly used in conjunction with other benefits such as arbitrage to achieve maximum financial gains. This is commonly used for applications where end-users are seeking to reduce demand charges due to load spikes.

    NRI systems are designed to respond with power quality control allowing the BESS/DES to charge and discharge based upon the frequency regulation and voltage support needs of the grid. This is generally activated on either a time of day basis or through signaling (SCADA). Specific kVAr or power factor may be input in order to achieve desired reactive power levels. Other advantages of power quality include the ability to manage frequency and voltage regulation.

    Load Reduction is designed to deploy the maximum amount of energy into the grid during specific key time-frames which are generally associated with the monthly transmission peaks and/or annual capacity peak for the utility, or the ISO. Used as a method to reduce the utility’s overall load within the ISO during a specified period, load reduction involves critical forecasting on the utility’s part in conjunction with signaled response from the NRI unit. With load reduction a complete discharge is generally configured in the 2-3 hour time-frame.

    When BESS/DES units are deployed in conjunction with renewable resources, or when a utility wishes to have the energy storage capable of a complete disconnection from the grid in order to provide backup power to a specific location as a result of grid failure, the islanding function is often configured. In an island function, the energy storage unit will charge utilizing any locally generated power (PV / diesel generator) and will discharge to a specific predetermined load.

    In Reserve Mode, the BESS/DES will automatically power the pre-determined load if for any reason there is a lack of power from the grid. This is generally a selected priority setting for the BESS/DES allowing the unit to function in another Mode of Operation so long as there is an active grid connection. In the event of a grid failure, the BESS/DES would switch modes to power only its assigned load, IE – Emergency operations center.

    When an energy storage system is configured with a renewable generation source and if the battery bank is fully charged, the system will route all excess power back to the grid.

    Time of day routing allows the energy storage system to perform a series of pre-determined functions at a specific time each day. This could include any of the operation benefits listed above.

    In emergency situations, systems equipped with a generator may switch autonomously to generator mode of operation. This may be enabled either through a timed delay, a specific depth of discharge (DoD) of the battery, or based upon a specific load profile once the energy storage system has become isolated from the grid.

    Manual operation allows the end-user or NRI to manually control the operation of the system through a secure HMI interface at the location or through a secure web portal (if desired).

    Testing and Diagnostics allows NRI or system operators the ability to test various monitoring systems of the BESS/DES including signaling and communication systems.

    Hive mode allows multiple storage devices across the grid to simultaneously support a variety of functions at once.

Demand Charge Reduction

Demand Charge Reduction

Frequency Regulation

Frequency Regulation

Peak Shaving

Peak Shaving

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