Closed beta·The first secondary CAE marketplace in Spain, currently in development·Request an invitation
Buy CAE with transparency to meet your annual obligation
A daily order book built for energy retailers that are Sujetos Obligados of the FNEE. Acquire the volume you are missing at a discovered price, with no chains of intermediaries, and let the platform handle regulatory traceability for you.
Discovered price
Daily order book, not opaque bilateral negotiation.
Aggregated volume
Automatic splitting across multiple SD from 30 MWh.
Commission from 0.15%
Mega tier for large buyers. Direct SEPA settlement.
CAE compliance, without the noise of the OTC market
Each year, a Sujeto Obligado retailer receives from the CNMC the exact volume of energy savings it must demonstrate before 31 March of the following year. The 2025 national obligation set by the MITECO is 4,942 GWh distributed among the retailers identified in Art. 70 Ley 18/2014. In 2026 it rises to 9,325 GWh.
Outside an organized market, meeting that obligation today involves:
- Acquiring a precise volume of CAE before the CNMC deadline, with a penalty of 1.5 times the CAE cost per MWh not delivered.
- Negotiating case by case with Sujetos Delegados and brokers, with no public price reference and wide spreads.
- Manually verifying the authenticity, validity and absence of liens of each certificate acquired.
- Managing contracts, eIDAS electronic signatures, transmission on the Sede MITECO and SEPA payments in separate workflows.
What you get on CAE Market as a buyer
Discovered price in the order book
You publish your purchase bid with a maximum price. Matching occurs when an SD offer crosses your book. Every close feeds a daily index visible to participants, which disciplines the negotiation spread compared with bilateral OTC.
Automatically aggregated volume
A single bid can be filled by several combined SD offers. You publish 5,000 MWh and the platform automatically aggregates lots from 30 MWh until your order is complete, managing a separate contract per seller but a single bid on your side.
Integrated documentary compliance
Each match triggers the automatic generation of the Art. 17.2 Orden TED/815/2023 sale contract, the eIDAS electronic signature of both parties and the transmission order to be filed on the Sede MITECO. The seller has 5 business days to fulfil their part.
Reporting for the CNMC Memoria
Structured export of all your transactions: Registro Nacional identifier, ficha IDAE, MWh, EUR, contract reference and transmission date. The format is directly reusable for the annual Memoria that retailers submit to the CNMC regarding their FNEE compliance.
Calculate your purchase cost and the applicable commission
Enter the volume you need to acquire and the target price you are willing to accept. The calculator applies the official buyer commission grid according to the tier assigned by purchase volume accumulated over 12 months, and estimates the savings versus a reference OTC negotiation.
Your planned purchase details
Your organisation's annual CAE obligation, expressed in megawatt-hours. Minimum volume per transaction on Mercado CAE: 30 MWh.
Observed range 2026: 115 - 140 EUR/MWh. FNEE 2025 ceiling price (MITECO): 189,17 EUR/MWh.
Buyer tier assigned automatically
Medium·500 - 5.000 MWh / 12 months·commission 0,40 %
The tier is determined by the purchase volume accumulated over the last 12 months. See the full grid.
Estimated result
| Gross cost (volume x price) | 125.000,00 EUR |
|---|---|
| Mercado buyer commission (0,40 %) | 500,00 EUR |
| Total acquisition cost | 125.500,00 EUR |
| Estimated saving vs OTC (1,50 % reference) | 1.375,00 EUR |
Indicative estimate. The actual saving depends on volume, effective matching and the OTC conditions compared. The OTC reference rate (1,50 %) corresponds to the average cost observed in bilateral negotiations between Sujetos Obligados and Sujetos Delegados, broker commissions included. It is neither a binding offer nor a market price prediction.
CAE Market versus the alternatives for compliance
The relevant decision for an SO is not whether to buy CAE: it is how to buy them. These are the three usual routes, compared across the dimensions that genuinely change the total cost of compliance.
| Dimension | CAE Market | Bilateral OTC | Courtiers / brokers |
|---|---|---|---|
| Discovered price | Yes | No | Partial |
| Minimum volume | 30 MWh | Negotiable | 100 - 500 MWh |
| Buyer commission | 0,15 % - 0,60 % | 0% direct | 1% - 3% broker |
| Contracting timing | 24 - 48 h | Weeks | Weeks |
| MITECO traceability | Integrated | Manual | Partial |
| Compliance reporting | Exportable | Manual | Partial |
Use case: electricity retailer with a 5,000 MWh obligation for 2025
A mid-sized retailer with a residual FNEE 2025 obligation of 5,000 MWh to close before 31 March 2026. Its compliance team compares two routes: signing with three known SD via OTC or publishing a bid on CAE Market.
Action
Publishes a bid for 5,000 MWh at a maximum price of 125 EUR/MWh. Within 72 h, the book aggregates 4 offers from different SD (1,200 + 1,500 + 1,000 + 1,300 MWh) at prices between 119 and 124 EUR/MWh. Batch eIDAS electronic signature of the 4 contracts.
Outcome
Compliance closed in 3 weeks, with full MITECO traceability and exportable CNMC reporting. Market commission cost: Large tier, 0.25%. 12-month volume accumulated with each new purchase.
Alternative OTC route
Simultaneous negotiation with 4-5 SD over 2-3 months, prices between 128 and 138 EUR/MWh depending on the intermediation chain, scattered document management and a risk of not covering the full volume before the CNMC deadline.
Illustrative scenario based on the range observed in 2026 (115 - 140 EUR/MWh) and the official commission grid. It constitutes neither a price commitment nor a matching guarantee.
Frequently asked questions from Sujetos Obligados
Who can register as a Sujeto Obligado?
Wholesale retailers of electricity, natural gas and petroleum products identified as Sujetos Obligados of the FNEE by the MITECO under Art. 70 of Ley 18/2014 and RD 36/2023. Registration on CAE Market requires proving SO status by means of the NIF, the registration certificate in the Registro de Comercializadores and the eIDAS electronic signature of the legal representative.
Can I buy a partial volume to complete my obligation?
Yes. The order book lets you split any purchase bid across multiple sellers. If your remaining obligation is 5,000 MWh, you can aggregate lots of 30 MWh or more until you reach the exact volume, with a single published bid. The minimum volume per transaction is 30 MWh.
How is it verified that the purchased CAE is authentic?
Each CAE listed for sale on the platform is linked to its registration in the Registro Nacional de CAE (MITECO) via the official identifier. Before matching, CertificAhorro checks that the certificate is in force, not expired, free of liens and that its holder is in fact the seller. The sale contract incorporates the Registro identifier and the issue date.
When is the CAE reflected in my MITECO registration?
The seller has 5 business days after signing the contract to file the transmission request on the Sede MITECO. Once processed by the Gestor Autonómico and validated by the MITECO, the CAE appears in your name in the Registro Nacional. The usual subsequent registration period is 2 to 4 weeks, traceable from the tracking panel.
What documentation do I receive for the Memoria before the CNMC?
The platform exports a structured report per transaction and an annual consolidated report: Registro Nacional identifier, issue date, ficha IDAE, MWh, EUR, seller, reference of the eIDAS-signed contract and MITECO transmission date. The format is directly reusable for the annual Memoria that retailers must submit to the CNMC within the framework of the FNEE.
Can I negotiate a price outside the order book?
The order book is the main mechanism: it guarantees discovered price and traceability. Nevertheless, the platform accepts operations negotiated bilaterally between the parties provided both parties are registered and the contract is signed on the same Art. 17.2 Orden TED/815/2023 template. The applicable commissions are identical.
Is there a maximum volume per transaction?
There is no operational ceiling. The platform has been sized to handle the full annual volumes of the largest SO. For purchases above 20,000 MWh per transaction, your buyer tier automatically drops to Mega (0.15% commission) and the CAE Market team validates the operation before matching.
Security for Sujetos Obligados
Mandatory KYC of the counterparty, deterministic matching, eIDAS signature, freezing of the CAE in transit and an immutable audit log. The five technical controls that protect your annual compliance.
Get ready for the 2026 obligation with a transparent order book
We are admitting new Sujetos Obligados retailers into the closed beta while we consolidate the order book. Request an invitation to access the test environment with real prices and contracts.
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