
Energy storage solutions for grid applications are becoming more common among grid owners, system operators and end-users. Storage systems are enablers of several possibilities and may provide effici. . ••Service stacking is a promising method to improve energy storage. . BESSbattery energy storage systemCAEScompressed air energy storageDSO. . Current global climate policies have initiated an energy system revolution aiming for sustainable and environmentally adapted solutions. To reach the defined targets by the Pa. . Energy storage is an enabler of several possibilities within the electric power sector, and the European Commission has proposed a definition of energy storage in the electric syste. . In this section, the function and properties of available services and applications will be presented. To be able to categorize and compare different applications and services, the defi. [pdf]
Service stacking is a promising method to improve energy storage system integration. There are several interesting cases where service stacking is crucial. Frequency supportive services are the most common to add when expanding portfolios. There is no standard method to solve optimization of service portfolios.
Battery storage systems can add significant value to the grid and to project developers by providing multiple services, known as value-stacking. This multi-use approach to battery energy storage systems (BESS) is essential for maximizing their overall value.
To ensure that an energy storage investment is guaranteed a reasonable payback period and a good return of investment it is advantageous to consider the possibility of service stacking. By offering additional services in turns or in parallel with the main service it is possible to create important revenue streams.
Storage units that are operating mainly for a service with large seasonal variation, service stacking has a great potential to be implemented. RES integration and T&D investment deferral are two examples of such services which both include large annual variations.
The opposite is valid for a power demanding main service. One interesting approach is to consider service stacking already during the dimensioning process. This approach requires an optimization of the storage size given the specified portfolio, accounting for all relevant services included.
Service stacking, alternatively value stacking or revenue stacking, is a promising method to optimize and maximize the technical and economic potential of an ESS. The aim is to find one or more additional services which the ESS can provide, besides of the main service. Offering additional services results in higher degree of utilization of the ESS.

Tax incentives for the energy storage industry include12:Investment Tax Credit (ITC): This federal incentive may apply to energy storage systems such as batteries, depending on ownership and usage.Modified Accelerated Cost Recovery System (MACRS): This depreciation deduction can also benefit energy storage investments.Inflation Reduction Act (IRA): This law allows standalone storage systems to be eligible for a 30% ITC, and up to 70% with additional incentives2. [pdf]
Image: President Biden via Twitter. The Inflation Reduction Act’s incentives for energy storage projects in the US came into effect on 1 January 2023. Standout among those measures is the availability of an investment tax credit (ITC) for investment in renewable energy projects being extended to include standalone energy storage facilities.
Domestic Content – IRS Notice 2023-38 (May 12, 2023) An energy storage project (among others) is eligible for an “adder” bonus credit (generally an additional 10% ITC) if it satisfies US Federal Transit Administration–based “Buy America Requirements” for domestic content.
Industry Insight from Reuters Events, a part of Thomson Reuters. Tax credits in the U.S. Inflation Reduction Act will accelerate storage installations near urban areas and offer greater revenue potential for projects coupled with solar, industry experts said.
In addition to the bonus for the Investment Tax Credit for projects in low-income communities, the Inflation Reduction Act: Provides a bonus credit of up to 10 percentage points for qualifying clean energy investments in energy communities.
An energy storage project (among others) located in an “energy community” receives an “adder” additional credit (generally an additional 10% ITC). The energy community guidance provides definitional rules for each of the three categories of energy communities (Brownfield Category, Coal Closure Category, and Statistical Area Category).
The separate ITC incentives mean that storage assets can be developed in "locations that best suit economics," such as in urban areas where large solar farms are not possible, he noted. Faster storage growth can mean greater potential for solar.

The Energy Storage Tax Incentive and Deployment Act aims to expand the tax credit for investments in energy property to include equipment that stores and delivers energy using various technologies, such as batteries, compressed air, pumped hydropower, and thermal energy storage. The bill proposes a 30 percent investment tax credit (ITC) for energy storage systems, similar to what is offered for solar PV systems12. [pdf]
The Inflation Reduction Act (IRA) has also accelerated the development of energy storage by introducing investment tax credits (ITCs) for stand-alone storage. Prior to the IRA, batteries qualified for federal tax credits only if they were co-located with solar. Wind.
Approximately 16 states have adopted some form of energy storage policy, which broadly fall into the following categories: procurement targets, regulatory adaption, demonstration programs, financial incentives, and consumer protections. Below we give an overview of each of these energy storage policy categories.
With the rise of solar and wind capacity in the United States, the demand for battery storage continues to increase. The Inflation Reduction Act (IRA) has also accelerated the development of energy storage by introducing investment tax credits (ITCs) for stand-alone storage.
The bill also expands the tax credit for residential energy efficient property to include expenditures for battery storage technology that (1) is installed on or in connection with a dwelling unit located in the United States and used as a residence by the taxpayer, and (2) has a capacity of at least three kilowatt hours.
All of the states with a storage policy in place have a renewable portfolio standard or a nonbinding renewable energy goal. Regulatory changes can broaden competitive access to storage such as by updating resource planning requirements or permitting storage through rate proceedings.
For the most part, battery energy storage resources have been developing in states that have adopted some form of incentive for development, including through utility procurements, the adoption of favorable regulations, or the engagement of demonstration projects.
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