Latest / Energy Economics with Fexingo: Oil Prices, Renewables, and the Cost of Power / Why Battery Storage Is Crashing While Solar Stocks Sink
Transcript
- Lucas: Let's start with a number that stopped me this week: Enphase Energy, ticker e n p h, down twelve percent in five days. That's not a bad week — that's a rout. Luna: And it wasn't just Enphase. The Invesco Solar ETF, TAN, fell ten percent. First Solar dropped nearly eight. The whole clean energy complex got hammered. Lucas: Right. But here's what's interesting — oil and gas stocks were basically flat. Exxon up half a percent, Chevron up eight-tenths. So this isn't a macro selloff. It's sector-specific. Luna: So if oil isn't dragging them down, what is? Because we've seen a pattern where clean energy rises when oil falls, and vice versa. This feels different. Lucas: It is different. I think the real story this week is battery storage. Enphase is primarily a solar inverter company, but their growth narrative — and their valuation — hinges on storage. The Enphase IQ Battery is a big part of their pitch. And I think the market is suddenly pricing in a margin squeeze in storage. Luna: Because battery prices are falling fast, right? I saw that lithium-ion battery pack prices dropped below $95 per kilowatt-hour in 2025. That's down from over $150 a few years ago. Lucas: Exactly. And falling battery costs are good for deployment — we set a record in 2025 with over 10 gigawatt-hours of utility-scale storage added in the U.S. alone. But here's the tension: when the hardware gets cheaper, the system integrators and inverter makers have to cut their prices too. Their margins compress if they can't differentiate. Luna: So Enphase is caught between falling battery cell prices and competition from Tesla, SunPower, and a bunch of Chinese manufacturers flooding the market? Lucas: Exactly. And the market is also looking at natural gas. We added about 15 gigawatts of new gas-fired generation in 2025. Those plants are designed to run as peakers — they complement renewables. But they also sign long-term capacity contracts that lock in revenue for years. That undercuts the economic case for paired solar plus storage, which has higher upfront capital costs. Luna: So even though the Inflation Reduction Act offers tax credits for storage, the actual grid economics are shifting. Gas plants are cheaper to build right now, and they're getting built. Lucas: Yes. And the storage market is responding with lower prices, which is great for utilities and ratepayers, but terrible for the companies that make the hardware. Their revenue per megawatt-hour is shrinking. That's exactly what you see in Enphase's recent earnings — storage revenue grew in units but not in dollars. Luna: So the selloff isn't irrational. It's the market saying 'we overestimated the profitability of storage in a world where batteries are a commodity.' Lucas: I think that's right. And look at First Solar — they dropped eight percent but they're a module manufacturer, not a storage play. Their drop might be sympathy selling, but also concern that utility-scale solar projects are being paired with cheaper storage and that pressures their module pricing. Luna: Meanwhile, natural gas stocks like EQT and Chesapeake are up this week. The divergence is stark. Lucas: It really is. And I want to be careful not to overstate this — battery storage installations are still growing. But the market is now differentiating between 'growth' and 'profitable growth.' Enphase has a lot of growth, but the street is questioning whether they can sustain margins above 40 percent. Luna: They reported gross margin of 44 percent last quarter, but guided down to 42 percent for this quarter. That's not a disaster, but it's a trend. Lucas: Right, and when you combine that with the macro picture — interest rates still elevated, inflation sticky at 3.3 percent on core CPI — companies that need customers to finance big upfront costs get squeezed. Solar plus storage is a big upfront cost. Luna: So the clean energy trade is being repriced. Not because the transition is failing, but because the margins are normalizing. And the market hates that. Lucas: Exactly. And look — we talk about this stuff every day because the energy economy is changing fast. If you find these conversations useful, honestly, a few listeners help keep it going through buy me a coffee dot com slash fexingo. No ads, no sponsors — just listener support. It makes a real difference. Luna: Yeah, it really does. And it keeps us free to dive into whatever angle matters most each week, without worrying about commercial breaks. Lucas: So back to the numbers — one more data point. The 10-year breakeven inflation rate is at 2.36 percent, essentially flat. The Fed isn't getting a clear signal on inflation, which means rates stay higher for longer. That's another headwind for capital-intensive clean energy projects. Luna: Higher rates increase the cost of capital for solar and storage installations. That's a direct hit to demand. Lucas: Yes. And the interesting thing is, oil is actually up this week — WTI crude at 90.54, Brent at 93.09. So higher oil prices would normally boost clean energy substitutes, but that effect is being overwhelmed by the margin story and the rate story. Luna: So the clean energy sector is facing a triple whammy: falling margins in storage, higher interest rates, and competition from natural gas that is actually being built right now. Lucas: Exactly. And I think the next six months will tell us whether Enphase and others can adapt — either by cutting costs faster than prices fall, or by finding new revenue streams like software and services. If they can't, the selloff has further to go. Luna: It's a tough spot. The transition is real, but the business models are still being tested. Lucas: And that's the story this week. We'll be watching.