Origin Energy’s market capitalisation sits comfortably past $15 billion. AGL’s has spent most of the past two years struggling to hold above $10 billion. That gap is the whole story, if you’re in a hurry. It tells you which of the country’s two big listed gentailers the market thinks has the better balance sheet under it, and it’s not the one that gets more headlines for building batteries.
I’ve spent a fair bit of this year going back through both companies’ investor presentations, and the contrast in strategy is sharper than most coverage gives it credit for. AGL is racing to get out of coal generation and into firming assets before its ageing fleet becomes a liability. Origin is doing the same thing, on paper, but with a gas business underneath it that keeps writing cheques nobody at AGL gets to write. Same transition, two very different financial positions to fund it from.
The boardroom fights that shaped both companies
Neither company chose its current strategy in a vacuum. Both had it partly forced on them by shareholders and suitors.
AGL’s board spent 2022 fighting off Mike Cannon-Brookes’ Grok Ventures, which built a stake and blocked the company’s plan to demerge its coal generation into a separate entity. The board and CEO didn’t survive that fight. What came out the other side was a company committed to closing its Victorian brown coal plant, Loy Yang A, a decade earlier than originally planned, and pouring capital into grid-scale batteries on old coal sites like Liddell and gas sites like Torrens Island. AGL set out the accelerated Loy Yang A closure timetable, targeting 2035, in its own ASX filings and investor briefings.
Origin had its own near-death experience at the takeover table. In 2023 and into 2024, a consortium including Brookfield and MidOcean/EIG tried to take the whole company private, at a price plenty of Origin’s own shareholders decided undervalued the business, particularly its stake in the Australia Pacific LNG venture. The vote failed. Origin stayed listed, kept its 27.5 per cent share of APLNG, and kept the cash flow from that gas export business, which is precisely the asset the bidders wanted most. That single failed takeover probably explains more about Origin’s current confidence than any strategy document since.
AGL’s bet: batteries funded by a thinner balance sheet
AGL is, in effect, the country’s biggest landlord of retiring coal sites turning them into battery paddocks. That’s a reasonable one-line summary of the pivot I wrote about in more detail in AGL’s coal exit and battery build-out plan. The logic is sound: the sites already have grid connections, transmission access and, in some cases, water rights and land the company already owns outright. Converting a coal paddock into a battery paddock is cheaper than starting from a greenfield REZ site.
But AGL is doing this with a retail and generation business that doesn’t have a gas export arm quietly topping up the coffers every time the wholesale gas price spikes. Its earnings are more exposed to the volatility of the National Electricity Market itself, the swings I went through in why wholesale electricity prices swing so violently. When Loy Yang A is running flat out on a hot afternoon, AGL captures the upside. When it’s tripped offline unexpectedly, which brown coal units do more often as they age, AGL wears the downside directly, with less of a hedge sitting underneath it than Origin has.
Origin’s bet: gas cash flow buying time
Origin’s Eraring coal plant on Lake Macquarie was due to close in 2025. The NSW government paid to keep it running into 2027, a deal I covered at the time in the piece on how 2025 became 2027 for Eraring. That extension bought Origin two extra years of generation revenue from an asset it had already largely written down, at essentially no risk to Origin’s own capital.
Underneath all of that sits APLNG, the Queensland coal seam gas-to-LNG venture Origin shares with ConocoPhillips and Sinopec. It’s the single biggest reason Origin’s market value sits well clear of AGL’s, and it’s also the reason critics keep asking whether the company writing itself up as a clean energy transition story is actually a gas exporter with a retail arm attached. I don’t think that’s quite fair, but it’s not nothing either. Origin has used the APLNG cash flow to buy into Octopus Energy, the UK retail technology platform, and to fund battery builds at Eraring and Mortlake in Victoria without stretching its own credit metrics the way AGL has had to.
Whether that gas exposure is a liability or an asset depends entirely on where east-coast gas prices go next, a question I keep circling back to in whether the gas industry has been written off too early. My honest view is that most of the commentary treating Origin’s gas book as a stranded-asset risk has got the near-term picture backwards. Domestic gas is tight, export contracts are long-dated, and APLNG is going to keep generating cash well past the point most of AGL’s coal fleet has gone to scrap.
Retail: the quieter battlefield
Both companies still make a large share of their money the boring way, selling electricity and gas to households and businesses. AGL runs close to four and a half million customer accounts. Origin’s book is a similar scale. Neither company is winning that fight on price; the Default Market Offer resets the floor every July regardless of what either company would prefer, a dynamic I went through in the Default Market Offer and your power bill. Where they’re actually competing is on the software layer: virtual power plants, home battery orchestration, EV charging tariffs, and whatever comes out of Origin’s Octopus Energy technology partnership versus AGL’s own in-house retail platform.
It’s a quieter battlefield than the generation story, and it gets less attention, but the margins in retail are where both companies actually make money most years. Generation is where they take the risk.
Who actually firms the grid when it matters
The Capacity Investment Scheme has become the mechanism both companies now lean on to de-risk new firming builds, and it’s worth understanding properly before comparing their project pipelines; I laid out the mechanics in how the Capacity Investment Scheme actually works. AGL has been more aggressive chasing CIS-backed battery contracts on its own retired sites. Origin has been more selective, mixing CIS bids with projects it can fund off its own balance sheet, which it can afford to do because of the gas cash flow underneath it.
Both companies are also, in their own way, betting against the idea that gas peaking plants are finished. AGL still runs gas peakers alongside its batteries; Origin’s Eraring battery sits next to a coal unit it’s still burning. The argument over which technology actually firms the grid when solar drops off at dusk isn’t settled, and I’d point sceptical readers to gas peakers versus big batteries: who firms the grid for the fuller version of that debate. Neither AGL nor Origin has picked a side outright. Both are hedging with a foot in each camp, which is probably the sensible thing to do given how unresolved AEMO’s own reliability modelling still is on this question.
The verdict
If I had to back one strategy over the other for the next five years, I’d back Origin’s, and not because I think AGL’s battery build-out is wrong-headed. It isn’t. But Origin is running the transition with a gas cash machine funding the risk, while AGL is running it on a thinner balance sheet with more direct exposure to an ageing coal fleet that could still throw up expensive surprises before it closes. That’s not a moral judgement on either company. It’s a balance-sheet one.
AGL’s bet pays off bigger if battery economics keep improving and the coal fleet limps to retirement without a major failure. Origin’s bet pays off regardless, because the gas earnings arrive whether the coal exit goes smoothly or not. The market’s already made that call, which is roughly what the $5 billion-plus gap in their valuations is telling you. Whether that gap closes once AGL’s battery fleet is fully online, or whether Origin’s gas advantage just compounds, is the thing worth watching over the next couple of reporting seasons: for anyone still deciding which of these two stocks, or which of these two strategies, they actually believe in.
For the primary data behind both companies’ generation output and reliability performance, AEMO’s NEM data dashboard and the AER’s annual State of the Energy Market report remain the best independent cross-check against either company’s own investor materials.
AEMO’s National Electricity Market overview and the AER’s State of the Energy Market report are both worth ten minutes of anyone’s time before taking either company’s own pitch at face value.
– Marcus Wren, Editor
Photo by Bernd 📷 Dittrich on Unsplash