First Solar or Enphase Energy: Which Solar Company Stands Out Today?

Solar Industry Growth and Key Players

With renewable energy gaining momentum, investors are increasingly focusing on companies that are pivotal in the solar sector. Among the most notable are First Solar, Inc. and Enphase Energy, Inc.. Both benefit from the global transition to clean energy, but they serve distinct segments of the solar market and each brings unique advantages.

As industries worldwide shift toward sustainable and dependable energy sources, solar power has emerged as a leading renewable option. The expansion is evident in the increasing number of solar panel installations across residential, commercial, and utility-scale projects. Government incentives, corporate sustainability goals, and consumer efforts to reduce energy expenses are all fueling the adoption of solar technology. These combined influences are driving steady growth in solar capacity in both advanced and developing economies.

First Solar (FSLR): Expansion and Manufacturing Strength

First Solar is actively increasing its production capabilities to meet rising global demand for solar solutions. In 2025, the company began manufacturing Series 7 modules at its new Louisiana facility, producing 16.1 gigawatts (GW) and selling 17.5 GW of modules. This expansion is expected to enhance its international footprint and support future revenue streams.

The company has recently launched operations at its fourth and fifth U.S. manufacturing sites and expanded its Ohio operations, with a sixth facility under construction and scheduled to open in late 2026. First Solar’s vertically integrated, continuous-flow manufacturing process enables efficient, large-scale module production across plants in the United States, India, Malaysia, and Vietnam. To sustain growth and technological innovation, First Solar anticipates capital expenditures of $0.8 billion to $1 billion in 2026, targeting new facilities, equipment upgrades, and research and development.

Enphase Energy (ENPH): Battery Storage and Microinverter Leadership

Enphase Energy has established a strong presence in the battery storage market with its integrated solar-plus-storage systems. In the fourth quarter of 2025, the company shipped 150.1 megawatt-hours of IQ Batteries, reflecting robust demand in key solar markets. Enphase’s third-generation IQ Battery 5P is now available to customers in Australia, New Zealand, the U.S., Puerto Rico, Mexico, Canada, the U.K., Italy, France, the Netherlands, Luxembourg, Belgium, Romania, and India.

Enphase also leads the U.S. microinverter segment, having revolutionized the industry with its semiconductor-based microinverter technology, which converts electricity at the module level. In Q4 2025, Enphase shipped approximately 1.55 million microinverters, showing strong year-over-year growth. The company continues to expand globally, launching new products such as the IQ9 microinverter in the U.S. in January 2026.

Next, let's examine the fundamental metrics of both companies to assess which may offer a better investment opportunity.

Comparing Zacks Consensus Estimates for FSLR & ENPH

According to Zacks Consensus Estimates, First Solar’s projected earnings per share (EPS) for 2025 have decreased by 0.13% over the past 60 days.

Source: Zacks Investment Research

Meanwhile, Enphase Energy’s estimated EPS for 2026 has risen by 4.76% during the same period.

Source: Zacks Investment Research

Return on Equity Comparison

At present, First Solar’s return on equity (ROE) stands at 17.32%, while Enphase Energy’s ROE is significantly higher at 41.33%.

Stock Price Performance

Over the past six months, FSLR shares have appreciated by 9.9%, whereas ENPH shares have surged by 29.1%.

Valuation Metrics

First Solar trades at a forward 12-month Price/Sales (P/S) ratio of 3.56, compared to Enphase Energy’s P/S ratio of 5.03.

Which Solar Stock Stands Out?

Both companies are prominent players in the growing solar sector. First Solar specializes in utility-scale projects and large-scale module manufacturing, focusing on domestic expansion and production capacity. Enphase Energy targets residential and commercial markets with its microinverters and battery storage products. While First Solar leverages manufacturing scale, Enphase distinguishes itself through advanced power electronics and integrated energy solutions.

Currently, Enphase Energy appears to be the more attractive option, thanks to its superior stock performance, earnings growth, and higher ROE compared to First Solar.

Both Enphase Energy and First Solar currently hold a Zacks Rank #3 (Hold).

Additional Resources

Looking for the latest stock recommendations from Zacks Investment Research? Download the 7 Best Stocks for the Next 30 Days for free.

• First Solar, Inc. (FSLR): Free Stock Analysis Report
• Enphase Energy, Inc. (ENPH): Free Stock Analysis Report