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In 2024, the most-watched line in Tesla's earnings wasn't a car. It was a battery. The energy segment - the Powerwall in someone's garage, the Megapack humming next to a substation - grew 67% to just over $10 billion in revenue, and did it at a 26.2% gross margin while the car business shrank 6% and earned closer to 19%.13 For a company famous for vehicles, the headline wrote itself: the quiet bet finally paid off, and the batteries are now more profitable than the cars.
Tesla's energy business is a high-margin juggernaut that was always the smarter bet. The energy business is genuinely fast-growing and genuinely useful - but its star margin is younger and softer than the story lets on, because a large share of it is a government subsidy parked inside the cost line. Read the same 10-K that prints the 26.2% and you find the asterisk.
“...benefits from manufacturing credits earned, amounting to $756 million and $115 million for the years ended December 31, 2024 and 2023, respectively.”2
The margin that a subsidy paid for
Here is the mechanism almost nobody traces. The IRA manufacturing credits don't sit in a separate 'subsidy' line where a skeptic would catch them. They land inside cost of revenue, lowering the cost figure that the gross margin is calculated against. So when the credit jumped from $115 million in 2023 to $756 million in 2024, it offset a 52% rise in the segment's cost of revenue and held the margin up.2 The reported gross profit was $2.64 billion.1 Back out the $756 million the company itself names, and the segment's adjusted gross profit is roughly $1.88 billion - a gross margin in the neighborhood of 18.6%, which is not better than the cars. It is the cars.
| As reported | Backing out the IRA credit | |
|---|---|---|
| Energy revenue | ~$10.09B | ~$10.09B |
| Energy gross profit | ~$2.64B | ~$1.88B |
| Gross margin | 26.2% | ~18.6% |
| vs. automotive (~19%) | Clearly higher | Roughly even |
And the segment's profitability is new in a way the 'always the quiet bet' framing erases. As recently as 2022, the same business ran a 7.4% gross margin - $288 million of gross profit on $3.9 billion of revenue.1 That is barely above break-even for a hardware line. The leap to genuinely high margin happened in a single year, and it happened alongside the credit ballooning sevenfold. Two things rose together; only one of them is operational improvement.
What the storage business actually is - and isn't
The product story underneath is real, and worth getting right because the press routinely garbles it. Powerwall, the residential battery, was first installed in 2015; it didn't ship at scale until Giga Nevada ramped in 2017, and the millionth unit went in only in 2025 - a decade from launch to a million.6 Megapack, the utility-scale unit, is the newer half, and it is where the volume now lives. Tesla deployed 31.4 GWh of storage in 2024, more than double the 14.7 GWh of 2023, with one quarter alone up 244% year-on-year.3 That deployment curve, not solar, is the engine. The solar sub-segment bundled under the same 'energy generation and storage' label is shrinking - deployments fell 38% year-on-year to 66 MW in a single 2023 quarter - so the 'energy business' headline quietly staples a declining solar unit to a booming battery one.7
Doesn't outgrowing the car business prove the bet was right?
The strongest version of the bull case is that the numbers speak for themselves. Tesla's own 2023 outlook promised energy storage would outpace automotive in 2024, and it did; Musk has long said storage would grow faster than cars, and now it visibly is.8 That's true, and it matters - but notice the trick of the comparison. Energy grew 67% while autos fell 6% in the same year.3 A racer doesn't have to be fast to pass a car that's braking. Half the gap is energy strength; half is automotive weakness. And the scale is wildly lopsided: energy was about $10 billion in 2024 against automotive's $77 billion.3 The fraction is growing fast, but it is still a fraction. The honest counter to the skeptic is that real demand is here - 31.4 GWh deployed is not a rounding error, and Megapack sells out as fast as Tesla can build it. The honest counter to the bull is that the demand arrived hand-in-hand with a $756 million subsidy and a growth rate that already cooled to 27% in 2025.4 Strip the subsidy from the margin and the deceleration from the trend, and you have an excellent, ordinary-margin hardware business - not a separate, structurally superior one.
Tesla disclosed the $756 million in plain language - the trap isn't secrecy, it's placement. A credit that lands inside cost of revenue flatters the gross margin without ever appearing as 'subsidy income,' so the number a reader anchors on is already adjusted in the company's favor. When you evaluate any policy-favored business - batteries, chips, EVs, anything riding a manufacturing or production tax credit - find the credit, decide whether it's structural (will it still be there in five years?) or a tailwind you're paying full price for, and re-run the margin without it. The version of the business that survives the subsidy ending is the only version worth valuing.
None of this makes Tesla's energy bet a mirage. The deployments are real, the product lead is real, and a business that went from a 7.4% margin to a profitable one in two years did something right.1 But the cleanest way to see a company is to ask what it looks like with the props removed. Take away $756 million of credit and the margin stops beating the cars; take away the year automotive happened to shrink and the growth stops looking unstoppable. The quiet bet is a good business wearing a great one's clothes - and the difference is exactly $756 million, disclosed in plain sight, in the line item nobody reads.
When the margin story has an asterisk
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Sources
Where this comes from — the filings, records, and reporting behind it.
- 1Tesla's energy generation and storage segment revenue was $10,086M in FY2024 (up 67% YoY from $6,035M in FY2023 and $3,909M in FY2022); energy gross profit was $2,640M at a 26.2% gross margin in 2024, versus $288M at 7.4% in 2022.
- 2Tesla's FY2024 10-K states that cost of energy generation and storage revenue 'benefits from manufacturing credits earned, amounting to $756 million and $115 million for the years ended December 31, 2024 and 2023, respectively,' with the increase partially offsetting a 52% rise in cost of revenue for the segment.
- 3Tesla deployed 31.4 GWh of energy storage in FY2024, up 114% from 14.7 GWh in FY2023; Q4 2024 alone was 11 GWh, up 244% on Q4 2023. Total automotive revenue was $77,070M in 2024 (down 6% YoY). Energy revenue from 2020–2025: $1,994M / $2,789M / $3,909M / $6,035M / $10,086M / $12,771M.
- 4Tesla's FY2025 energy generation and storage revenue was $12,771M (up 27% YoY), a deceleration from the 67% growth rate recorded in 2024; total FY2025 revenues were $94,827M.
- 5Energy generation and storage segment gross margin was 30.5% in Q3 2024 and 26.6% for the first nine months of 2024, exceeding total automotive gross margin of 20.1% (Q3) and 19.0% (nine months). This is per Tesla's Q3 2024 10-Q filed with the SEC.
- 6Tesla's own Powerwall product page states the first Powerwall was installed in May 2015; mass production began at Giga Nevada in 2017; Powerwall 3 was released in September 2023; and the one-millionth Powerwall was installed in 2025.
- 7The solar sub-segment within Tesla Energy is in decline: solar deployment was at 66 MW in Q2 2023, representing a 38% year-on-year decline from Q2 2022; storage is 'doing the heavy lifting' for the segment, with the 26.2% full-year 2024 gross margin closely tied to Megapack and Powerwall performance.
- 8Tesla's own January 2024 10-K outlook stated: 'In 2024, the growth rate of deployments and revenue in our Energy Storage business should outpace the Automotive business.' Elon Musk said: 'I predicted for many years that the storage business will grow much faster than the car business. It is doing that.'