Solar’s Most Hated Year Became Its Best Five Months. The Setup That Explains the 120% Gain.

If you bought Invesco Solar ETF (NYSEARCA:TAN) on the last trading day of 2025 at about $49 and checked your account at Monday’s close, your shares were worth about $71, a gain of about 45% in roughly five months. A $10,000 position became about $14,480. The SPDR S&P 500 ETF Trust (NYSEARCA:SPY | SPY Price Prediction) over the same window returned about 11%. So TAN is beating the broad market by something like four-to-one year to date, and the gap widened again last week when the fund tacked on another roughly 8% in five sessions.

That is the kind of number that gets screenshotted. It is also the kind of number that needs a closer look, because the same fund five years ago traded at about $77. Over a half-decade, TAN is still down about 8%, while the S&P 500 returned roughly 80%. The 2026 run is a recovery off a bombed-out base, not a fresh leg up from all-time highs. That distinction matters for what comes next.

The Funeral That Never Quite Happened

The framing that solar was "left for dead" in 2025 deserves a small correction. TAN actually finished 2025 up about 41%, climbing from about $35 in early January to about $49 by year-end. The deeper damage was 2022 through 2024, when rising rates ate into project financing economics and the threat of a Republican sweep had traders pricing in a partial unwind of the Inflation Reduction Act. A Yahoo Finance piece from October 2024 captured the mood: a potential Republican sweep could lead to the scaling back of Inflation Reduction Act funds, specifically residential and commercial green investment tax credits. By the time 2025 opened, solar was a sector that hedge funds had largely walked away from.

That setup, a hated sector with crushed multiples and a few real businesses inside the wrapper, is what produced the move. Over the past twelve months TAN has returned about 120% against SPY’s roughly 29%. The fund just put in a 20% month in May alone. Sentiment turned before the fundamentals fully did, which is usually how these things work.

What Actually Did the Work

TAN tracks the MAC Global Solar Energy Index and holds roughly 40 solar energy companies, with the top 25 holdings comprising about 93% of the fund. The names doing the heavy lifting in 2026 are familiar to anyone who watched the sector get punished. First Solar, Enphase Energy, Nextpower, and Enlight Renewable Energy sit near the top of the book, and the bullish-to-somewhat-bullish coverage on First Solar in particular has been steady through the spring. A May 21 Barron’s piece by Doug Busch flagged the setup directly, with TAN carrying a 0.403 bullish ticker sentiment score in Alpha Vantage’s aggregation.

Underneath the price action there is a real demand story. The EIA’s May 2026 Short-Term Energy Outlook revised its utility-scale solar generation forecast for 2026 1.4% higher than the prior month, citing more solar generating capacity online at the beginning of the year than previously estimated. Residential electricity prices are running about 18.2 cents per kilowatthour in 2026, a roughly 5% increase from 2025, which improves the payback math on rooftop systems. Estimated net summer solar PV capacity from utility and small-scale facilities reached 216,249 megawatts as of March 2026, up from 209,304 megawatts in December 2025. Installations are accelerating into a tightening grid.

The policy backdrop also failed to deliver the disaster that was priced in. The IRA tax credits remained intact through the first half of 2026, and the residential and commercial tax credits that solar developers depend on are still flowing. That is the simplest way to explain the move. The sector was priced for the worst case, and the worst case did not arrive.

What You Are Buying At $71

Here is the honest part. A reader who saw the headline and is thinking about chasing the move is buying a fund that has already done a roughly 8% week and a 20% month, with shares down about 4% on Monday alone. The setup that produced 2026’s gains, namely deep pessimism, depressed valuations, and a policy bogeyman that never showed up, is no longer the setup in front of you. Solar in June 2026 is consensus-bullish. A Motley Fool piece from May 23 framed it neatly, arguing TAN provides higher growth potential in the renewable solar energy sector versus traditional fossil fuel ETFs. That is the kind of take that shows up after the easy money has been made, not before.

The indicators worth watching from here are concrete. First, the EIA’s monthly capacity additions, which tell you whether the installation pace is holding or rolling over. Second, the trajectory of residential electricity prices, because every penny of rate increase tightens the payback period for rooftop solar and helps Enphase’s microinverter unit economics. Third, the legislative calendar around the IRA, since any serious attempt to claw back tax credits would re-introduce the discount that 2025 priced in. Fourth, the Fed’s path on rates, because solar project finance is one of the most rate-sensitive parts of the energy capital stack, and the rate cuts feeding the 2026 rally are already partly in the price.

A fund that is up 50% in five months after five flat years is doing something real. It is also a fund where the easy disagreement has been resolved in the bulls’ favor, which means new buyers are paying for a recovery that has largely already happened. The thing to remember is that the 2026 move was about a hated sector getting re-rated, not about solar suddenly becoming a different business. The next 50% will have to come from earnings, not from sentiment, and that is a much harder ask.