What Is PBW? Invesco WilderHill Clean Energy ETF

PBW is the Invesco WilderHill Clean Energy ETF, one of the oldest and best-known clean energy funds. It tracks the WilderHill Clean Energy Index, a roughly equal-weighted basket of around 70 to 80 companies advancing the clean energy transition, spanning solar, wind, hydrogen and fuel cells, electric vehicles and batteries, biofuels, and grid technology.

The fund's equal-weight construction means small and mid-cap innovators carry real weight rather than being drowned out by a few giants. That design gives PBW a more aggressive, higher-beta profile than large-cap clean energy funds, with an expense ratio of 0.64%.

Approximate weights as of mid-2026; refresh quarterly from Invesco's fund page. Each ticker links to its individual stock guide in Walnut.

Because PBW rebalances toward equal weights, its portfolio is spread fairly evenly across roughly 70 to 80 names, with top positions typically under 2%. Recent holdings have included OPAL Fuels, Darling Ingredients, Rivian, FuelCell Energy, Gevo, Plug Power, and a mix of solar, battery, biofuel, and grid companies.

The portfolio skews toward US small and mid-cap companies, many of which are earlier-stage and capital-intensive. This is what gives PBW its distinctive character: broad diversification within the clean energy theme, but a heavy tilt toward higher-risk, higher-growth names.

ICLN (iShares Global Clean Energy) holds larger, more established companies weighted by size and is cheaper, making it the steadier core option. TAN (Invesco Solar) is a concentrated solar bet. QCLN (First Trust NASDAQ Clean Edge) blends clean energy with technology and EV names and leans larger-cap.

PBW is the broadest and most equal-weighted of this group, spreading exposure across many clean energy subsectors while tilting toward smaller companies. That makes it the most diversified within the theme but also one of the most volatile, so investors often choose based on how much small-cap risk they want.

PBW's history is a case study in the clean energy sector's cyclicality. It surged during the 2020 to 2021 clean energy boom and then fell sharply as interest rates rose and speculative growth stocks corrected, taking many small-cap clean energy names down with them.

The long-term thesis rests on decarbonization, electrification, and continued cost declines in solar, batteries, and hydrogen. But the path is highly sensitive to interest rates, government policy, and investor sentiment. Given its small-cap, equal-weight design, PBW tends to amplify both the upswings and the downswings of the underlying theme.

PBW concentrates in a single, cyclical theme and weights small and mid-cap companies heavily. Many holdings are unprofitable, capital-intensive, and dependent on subsidies or favorable policy, which makes them acutely sensitive to interest rates and political shifts.

The result is a fund that can rise or fall far more than the broad market. Investors who use PBW typically treat it as a small satellite position, size it deliberately, and accept the possibility of deep, extended drawdowns as the price of high-beta exposure to clean energy innovation.

PBW may fit aggressive, risk-tolerant investors who want diversified, high-beta exposure to clean energy innovation and can stomach large swings over a long horizon. It is generally used as a thematic satellite, not a core holding. Walnut is not an investment adviser, so this page is descriptive information, not a recommendation; whether PBW fits depends on your goals, timeline, and risk tolerance, and you should do your own research or consult a licensed professional first.

PBW trades on NYSE Arca and is available through brokerages including Robinhood, Fidelity, Schwab, and Public, many with fractional shares. You can connect your existing broker to Walnut to hold PBW inside a thematic clean energy basket, track it against target weights, and analyze it alongside your other positions, while trades execute at your own broker.

ETFs are passive bundles; thematic baskets in Walnut let you concentrate within them. If you hold PBW as a core position, these are the themes you might layer on as satellites.

PBW is a high-volatility, thematic satellite holding for aggressive investors bullish on clean energy innovation. Its equal-weight, small-cap design means bigger upside in rallies and steeper drawdowns in downturns than large-cap peers. At 0.64% it is pricier than ICLN, and its returns have been very cyclical, so position sizing and time horizon matter.

Whether PBW is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is PBW a buy?

PBW yields ~2.7% as of mid-2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see PBW dividend: yield and schedule.