Indonesia's Carbon Exchange Doesn't Trade a Single Share of Stock
6 min read
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6 min read
The company that runs the Indonesia Stock Exchange (IDX) also runs a second exchange, and it does not sell a single share of stock. On its first day of trading, 26 September 2023, this exchange moved Rp29.2 billion worth of a completely different kind of asset: certificates proving that just under 460,000 tons of carbon dioxide had been kept out of the atmosphere. That exchange is Indonesia's carbon exchange, called Bursa Karbon Indonesia or IDX Carbon, and if you have never heard of it, that is not an accident. It was built for companies, not for you.
This article explains what a carbon unit actually is, who is allowed to buy and sell one, and why this market works nothing like the one NetWort tracks for you every day.
A stock represents a slice of ownership in a company. A carbon unit represents something completely different: proof that one ton of carbon dioxide equivalent (CO2e, a way of measuring different greenhouse gases on the same scale) was either avoided or removed from the atmosphere.
Every legitimate carbon unit in Indonesia has to be recorded in the Sistem Registri Nasional Pengendalian Perubahan Iklim (SRN-PPI), the government's national climate registry. Think of it as a ledger that tracks who created a unit, how large it is, who currently owns it, and whether it has already been used or retired. Bursa Karbon Indonesia is simply the regulated marketplace where units already sitting in that registry change hands, operated by PT Bursa Efek Indonesia (the same company behind IDX) under a license the Financial Services Authority (OJK) granted on 18 September 2023.
Not every carbon unit on this exchange means the same thing. There are two distinct types.
The first is called PTBAE-PU, and it works like a permission slip with a ceiling attached. The government sets an emissions cap for specific companies, currently centered on coal-fired power plants, and hands each one a quota. A plant that pollutes less than its quota ends up holding a surplus it can sell. A plant that pollutes more than its quota has to buy enough units to cover the difference, or face a penalty. This is a classic cap-and-trade design: the cap creates scarcity, and scarcity is what gives the unit a price.
The second is SPE-GRK, a voluntary carbon offset credit. This comes from a specific project, a geothermal plant, a reforestation effort, a methane-capture system, that has measured and verified a real reduction in emissions and had it certified. Unlike PTBAE-PU, nobody is required to buy an SPE-GRK unit. A company buys one voluntarily, usually to offset emissions it could not otherwise cut, or to support a sustainability commitment it has made publicly.
This is the part that matters most if you are wondering whether this exchange is something you should be paying attention to as an individual investor: right now, it almost certainly is not.
Bursa Karbon Indonesia was designed around companies, not individuals. When President Joko Widodo launched the exchange, his own remarks flagged 99 coal-fired power plants, representing 86% of Indonesia's entire operating coal fleet, as the initial pool of businesses expected to need PTBAE-PU units under the government's cap. Everyone else who has joined since is a company too: OJK's own count put registered "pengguna jasa" (service users, the exchange's term for its members) at 153 by the end of February 2026, up from 16 on launch day. That is company growth, not retail account growth, and none of the reporting on this exchange describes an ordinary person opening an account the way you would open a brokerage account to buy an IDX-listed stock.
The numbers show a market that is real but still small next to the stock exchange sharing its building. From that Rp29.2 billion opening day in September 2023, cumulative transaction value had reached Rp91.87 billion by the end of February 2026, according to OJK, spread across 153 registered companies. For comparison, IDX's own stock market regularly turns over more than that in a single trading session.
| IDX (stocks) | Bursa Karbon (IDX Carbon) | |
|---|---|---|
| What you own | A slice of a company | A certificate for one verified ton of CO2e |
| Who typically trades it | Any retail investor, through a broker | Companies with an emissions cap or a voluntary climate commitment |
| What sets the price | Company earnings, growth, sentiment | A government-set cap (PTBAE-PU) or project supply and corporate demand (SPE-GRK) |
| Registered participants | Millions of individual accounts | 153 companies, as of February 2026 |
| Ownership recorded at | KSEI, the central securities depository | SRN-PPI, the national climate registry |
Everything else NetWort helps you track, an IDX stock, a US stock, a cryptocurrency, has a market price you can look up in seconds and a brokerage account you can use to buy it directly. A carbon unit does not work that way for an ordinary investor. There is no retail brokerage flow for buying a PTBAE-PU or an SPE-GRK unit the way there is for buying a share of a bank or a telecom company, and the underlying registry, SRN-PPI, is built to track a company's compliance obligations, not to serve as a savings vehicle for individuals.
This is also a good moment to draw the line between two things this series has already covered separately. Owning an IDX stock means KSEI custodies your shares in an account held in your own name, a structure our explainer on who actually holds your shares covers in detail. A carbon unit is a completely different asset, recorded in a completely different registry, built for a completely different purpose. Confusing the two is an easy mistake to make simply because both trade on an exchange run by the same company.
If you are curious what you can actually buy and track today, from IDX-listed stocks to crypto to global indices, NetWort's Market page shows a live heatmap and price pulse across everything that is genuinely open to a retail investor, so you can see what is actually moving before you decide where to look next.