Lately, I've been focusing on energy storage stocks, and the more I research, the more I believe this sector is truly worth paying attention to. Speaking of energy transition, it's no longer news, but the real investment opportunities still hinge on the energy storage segment.

First, let's talk about why energy storage is so important. Wind and solar power—these renewable energies—have become cheaper now, but the problem is their output is unstable. Solar depends on sunlight, and wind power depends on wind conditions. So, you need a system that can store electricity when there's excess and release it when needed—that's the core value of energy storage. According to the latest forecasts, by 2030, the global cumulative capacity of energy storage installations will surpass one terawatt-hour, leaving plenty of room for growth.

From an investment perspective, there are actually many options when it comes to energy storage stocks. I’ve roughly divided them into a few categories. The first is battery manufacturers, which are the heart of energy storage systems. In the U.S. market, Tesla’s Megapack and Powerwall are leading the way. Enphase has a good residential storage penetration rate, QuantumScape is working on next-generation solid-state batteries, and they are now shifting from R&D to mass production. In Taiwan, New Power Focus specializes in lithium battery modules, and Chang Yuan Technology develops lithium iron phosphate materials and systems.

The second category is system integrators. These companies don’t just supply batteries—they also integrate inverters, battery management systems, energy management software, delivering a complete solution. In the U.S., Fluence Energy (a joint venture between Siemens and AES) is notable. Stem has an AI software platform called Athena that automatically determines charging and discharging timing. Generac performs well in residential backup power systems. In Taiwan, Delta Electronics is the strongest integrator, offering everything from power conversion systems to energy management software. ZTE Electric has a high market share in frequency regulation services for Taipower, and Soin Energy provides comprehensive green energy solutions.

The third category includes power equipment and infrastructure manufacturers. For energy storage to be effective, it must connect to the grid, so traditional power equipment like transformers and switchgear are also in high demand. NextEra Energy in the U.S. is the world’s largest renewable energy operator. Vistra has transformed old coal plants into the largest energy storage bases in the U.S. Eaton is a global leader in power management. In Taiwan, Walsin Lihwa is a leading transformer manufacturer, A-Lin’s switchgear and inverters are used in many green energy projects, and Shih Electric has been accelerating its green energy deployment in recent years.

The last category is raw material and component suppliers. Lithium, nickel, and cobalt are the lifeblood of batteries. Albemarle is the world’s largest lithium producer. Freeport-McMoRan operates copper mines, as copper is heavily used in energy storage equipment. In Taiwan, Formosa Plastics supplies electrolyte raw materials through its subsidiaries, Sanxing develops graphene materials to enhance battery performance, and Kintec and Meki-Ma are suppliers of cathode materials.

Honestly, the biggest advantage of investing in energy storage stocks is that this theme has strong policy support. Countries are pouring money into this sector to achieve carbon neutrality, so the industry outlook is relatively stable. However, risks do exist—especially for some new companies whose technologies may not be competitive. If they fail to reach profitability in the long run, their stock prices could be hit hard. My advice is to select stocks carefully, paying close attention to the company’s fundamentals and technological strength, and avoid blindly following the trend.

In the future, as electric vehicles become more popular and AI applications increase electricity demand, the need for renewable energy and energy storage systems will continue to grow. Every new policy announcement could stimulate the market, so investors should stay alert for opportunities. But regardless, discipline and risk management are ultimately the keys to profitability.