Transformative energy storage innovations

The energy storage industry is undergoing a transformative evolution, driven by the increasing demand for sustainable energy solutions, advancements in renewable energy technology, and the growth of AI data centers. As of 2026, the U.S. has installed over 163GWh of operational utility-scale battery storage power capacity, with 58GWh installed in 2025 alone. Battery energy storage systems (BESS) are essential for balancing supply and demand for energy sources like solar and wind.

Moving beyond lithium-ion batteries: long duration energy storage

Energy storage technology can be broken down into two duration categories: short and long duration energy storage. Most lithium-ion battery energy storage systems function in short duration, and are generally designed to deliver their full rated power for durations ranging from 1 to 4 hours. However, the sustainable grid of the near future will require a mix of energy storage resources to fill gaps when there are lulls in generation from wind and solar, including storage options that can run six, eight, and 12 hours, and some that last as long as a day or more. These technologies are essential for supporting intermittent renewable energy sources like solar and wind, enhancing grid resilience, and reducing our dependence on fossil fuels.

Innovations in LDES technologies

One of the biggest demands for energy storage in 2026 comes from data centers. Engineered to operate for eight to one hundred hours or more, LDES technology is uniquely capable of replacing fossil-fuel peaker plants that supply energy to data centers right now. These new and current LDES technologies can function as a potential energy source when facing high energy demand.

Key energy storage technologies for LDES include:

• Pumped Hydroelectric Storage (PHS)
• Compressed Air Energy Storage (CAES)
• Flywheel Energy Storage (FES)
• Thermal Energy Storage (TES)
• Hydrogen Energy Storage (HES)
• Advanced Battery Energy Storage (ABES): Nickel-hydrogen batteries, flow batteries
• Nuclear batteries

Pumped hydroelectric storage, compressed air, thermal storage, and flow batteries are all viable technologies for this LDES. Batteries and pumped hydro storage are the technologies with the highest number of deployed storage projects, while flywheels, thermal storage, compressed-air, and hydrogen are newer and have fewer deployments and are in research and development.

• Pumped Hydroelectricity Storage
  • Excess energy can be used during low demand periods to pump water from a lower dam to a higher one, essentially converting the upper reservoir into a giant battery.
  • While not new, pumped hydro is a proven technology with the largest installed capacity in the US with potential for LDES growth.
  • PHS is a large-scale technology with power capacity up to 1GW and discharge times of tens of hours, but is geographically limited.
• Compressed Air Energy Storage
  • CAES compresses air, which is then heated and expanded in a natural gas combustion turbine to drive a generator.
  • The positives of compressed air energy storage include a wide range of energy storage capacity, an environmentally friendly process (no fossil fuel), long life and durability, low self-discharge, and the low cost of the energy stored.
  • CAES technology has been commercially available since the late 1970s. One commercial demonstration CAES plant has been operating successfully for over 24 years, and another has been operating successfully for 11 years. Several other commercial CAES plants are also in development.
• Flywheel Energy Storage
  • Flywheel energy storage (FES) systems mechanically store energy by spinning a flywheel at very high speeds, converting electrical energy into kinetic energy.
  • The system maintains energy as rotational kinetic energy and slows down to convert energy back to electricity through a motor-generator.
  • FES systems have fast response times and function as an excellent replacement for traditional backup generators at data centers.
• Thermal Energy Storage
  • Thermal energy storage (TES) refers to energy stored in a material (such as molten salt or other minerals) as a heat source or cold sink and reserved for use at a different time.
  • TES systems’ advantages include low costs, long operational lives, high energy density, synchronous power generation capability with inertia that inherently stabilizes the grid, and the ability to output both heat and electricity.
  • TES technologies are already commercially available and address a wide range of storage durations and temperatures.
• Hydrogen Energy Storage
  • When there is excess electricity during periods of low demand, it can be used to split water into hydrogen and oxygen via electrolysis. This hydrogen can either be stored and used for energy later, or converted to methane that can be used in existing infrastructure.
  • Hydrogen storage’s potential applications include stationary power, portable power, and transportation, although its low energy per unit volume requires the development of advanced storage methods.
  • Research into hydrogen energy storage is expanding due to its much higher storage capacity compared to batteries, pumped hydro, and compressed air energy storage, despite its comparatively low efficiency.
• Advanced Battery Energy Storage
  • The U.S. has 908 operational utility-scale battery energy storage projects, using lead-acid, lithium-ion, nickel-based, sodium-based, and flow batteries. These projects totaled 40GW of rated power in 2025, and have round-trip efficiencies between 60–95%. Current innovations in battery technology include nickel-hydrogen batteries and flow batteries.
  • Nickel-Hydrogen Batteries
    • Nickel-hydrogen batteries can last for 30,000 charge cycles with almost zero maintenance and operate at a 90 percent round-trip efficiency, which exceeds lithium-ion battery RTE averages.
    • Their durability and lengthy charge cycles make them ideal for satellites and space probes.
    • These cylindrical battery systems are low maintenance, non-volatile, and require no special heating and cooling or safety systems, unlike lithium-ion battery storage.
  • Flow Batteries
    • Flow batteries store energy in liquid electrolytes held in external tanks. It is easy to increase the capacity of these batteries by enlarging tanks or boost their power by adding more cells.
    • The key benefit of flow batteries is their scalability: they are widely used for grid and long duration energy storage, microgrid systems, and as part of renewable energy systems, such as solar plants, where they store excess energy for later use.
    • Flow batteries can supplement resources such as pumped hydro energy storage, helping to manage energy during peak demand and ensuring grid stability.
• Nuclear Batteries
  • The newest and not-yet-commercialized energy storage technology are nuclear batteries which convert radiation from isotopes into electricity using semiconductors.
  • These batteries, such as the betavoltaic battery with carbon-14 (an unstable and radioactive form of carbon, called radiocarbon) have longer lifespans but lower output than lithium-ion batteries.
  • Another nuclear battery is in development by ANPEG: a modular, plug-and-play nuclear reactor that can generate 10MW of electricity and/or heat.

Lithium-ion battery packaging innovations at utility-scale

While researchers are investigating new energy storage technologies, the renewable energy industry is primarily invested in innovating new ways to package lithium-ion batteries for convenience, safety, and cost-efficient deployment at utility scale.

Most BESS systems are composed of securely sealed battery packs, which are electronically monitored and replaced once their performance falls below a given threshold. Pre-constructed, container-sized lithium-ion batteries that include ventilation, fire safety, and more are the standard for quick and safe installation for utility scale solar projects. These 18-wheeler sized containers feature plug-and-play architecture, consistent temperature maintenance, and enhanced safety measures.

Here are some of the current lithium-ion battery technology leaders and their applications:

The Energy Information Administration forecasts the strongest four-year growth in U.S. electricity demand since 2000. Utility-scale energy storage is critical to strengthening the electric grid as rapidly expanding data centers and a growing number of electric vehicles increase the country’s energy demands.

Helping power the future with energy storage

Experienced at all levels of BESS design, our engineers excel at both custom solutions and connecting multiple large-scale rechargeable lithium-ion battery stationary energy storage units, in addition to responding to project, site, and client requirements. “Blymyer is a leader in engineering renewable energy projects and energy storage systems,” says Director of Engineering Greg Mazur. “We are at the forefront of engineering utility-scale and distributed-generation battery energy storage systems that amplify the benefits of solar and wind energy generation.” Blymyer has completed design for energy storage projects with a total capacity of 11,630MWh.