Market & Tariffs
Mirox lets you describe how each plant earns money — the legal subsidy framework, the direct-marketing or PPA contract, the grid operator, and the buy/sell tariffs — so the platform can turn raw production into revenue figures and feed your financial reports. Today this is built around the German EEG market; other national schemes are planned.
Concept
A plant's revenue model is split into two independent layers:
- Market configuration — the regulatory and contractual setup for a plant: which subsidy framework applies, the EEG applicable-value bands, any direct-marketing (PPA) contract, the grid operator, and how curtailment is settled. This is what determines the price you actually receive per megawatt-hour of production.
- Tariffs — simple buy and sell rates in cents per kilowatt-hour, used for self-consumption and feed-in accounting at the meter level. Tariffs are a separate, lighter concept and do not replace the market configuration.
Alongside per-plant setup, Mirox also tracks the German wholesale market prices (day-ahead spot, monthly Marktwert, annual market premium) so everyone in your organization can see the market context their revenue is settled against.
Germany / EEG today
Market configuration is built around the German EEG (Erneuerbare-Energien-Gesetz) sliding market premium. Additional national frameworks — for example Italy, the Netherlands, and pure merchant/PPA settlement — are scaffolded but Planned, not yet active. When you choose an accounting region today, the only active option is Germany–EEG.
Market Configuration
Open a plant's market settings to describe its full revenue model in one place. The view returns the general configuration, the grid operator, the list of EEG bands and PPA contracts, plus several derived figures the platform calculates for you.
General Settings
The top-level configuration frames the whole calculation:
- Accounting region — the legal/subsidy framework the plant is settled under. Germany–EEG is the active region today.
- Market zone and technology — the lookup key (e.g. the bidding zone and the technology) used to apply the right market value to your production.
- Clipping — whether inverter clipping is reflected in the accounting calculation. Either considered or ignored; the default is ignored.
- Accounting responsibility — who performs the market accounting for the plant: the plant operator, the grid operator, or the marketer. The default is grid operator.
EEG Bands
EEG settlement works in capacity bands — slices of your installed peak power, each at its own "anzulegender Wert" (applicable value). You can add as many bands as your plant needs:
- Covered capacity — the slice of installed peak power this band applies to, in watts.
- Applicable value — the anzulegender Wert for that capacity, in euros per megawatt-hour.
- Validity window — an optional start and end date, so historical and future values can coexist on the same plant.
From your bands, Mirox computes a set of read-only figures so you can confirm the configuration is complete and correct:
| Figure | What it tells you |
|---|---|
| Installed peak power | The plant's installed peak production, in watts |
| EEG-covered capacity | The sum of all currently active EEG bands |
| Unassigned capacity | Installed peak minus EEG-covered (may be negative) |
| Effective applicable value | The capacity-weighted anzulegender Wert across active bands, in EUR/MWh |
| Allocation status | Whether the covered capacity is under, exact, or over the installed peak |
Allocation status helps you catch setup mistakes
A small mismatch between installed peak power and EEG-covered capacity is normal (rounding, AC versus DC ratings), so a 2% tolerance is allowed before the status is flagged as under or over. If a plant reads under, you have capacity that no EEG band covers yet; over means your bands sum to more than the plant's installed peak.
Direct Marketing and PPA Contracts
If the plant is sold through a direct marketer (Direktvermarktung) or a power purchase agreement, you can record those contracts on the plant as well. Each contract captures:
- Counterparty — the Direktvermarkter or offtaker name.
- Settlement method — how curtailment is settled, which also determines the production data source Mirox uses (a pyranometer-based reading, a weather-based estimate, or none).
- Management fee — the marketer's fee in euros per megawatt-hour.
- Validity window — when the contract is in force.
PPA contracts are not subscription contracts
The "PPA contracts" here describe how your plant sells its electricity on the market. They are entirely separate from the Mirox service contracts that govern your subscription and billing — see Accounting & Billing. Don't confuse the two.
Grid Operator
The grid operator configuration records the settlement method for grid-operator curtailment. As with PPA contracts, the chosen settlement method derives which production data source the platform uses for the calculation.
Market Prices
Beyond per-plant setup, Mirox tracks the German wholesale electricity market and exposes it to every member of your organization for context. This is read-only market reference data, ingested and kept current by the platform:
- Spot prices — day-ahead (SPOT) prices for a chosen delivery day in the German–Luxembourg bidding zone, including both confirmed and forecast points so you can see the upcoming day's price shape.
- Marktwert — the monthly market value per technology (solar, onshore wind, offshore wind) for a calendar year, with the most reliable published source automatically selected and a verified indicator showing when an official value has landed.
- Annual market premium (Jahresmarktprämie) — the annual market value per technology across all published years, with the latest value per technology highlighted.
- Bidding zones — the catalogue of zones available in the spot-price selector.
Market prices are region-wide, not per-organization
Market price data is the same for everyone and is not scoped to your plants. Any active user can read it. Your plant-specific revenue model lives in the per-plant market configuration described above.
How This Feeds Financial Reporting
The market configuration is what makes a financial report meaningful. When you generate a financial report for a plant, the platform combines its production with the configured EEG bands, PPA terms, and the relevant market value to express results in revenue terms rather than raw energy. See Reports for report types, periods, and downloads, and Forecasts for forward-looking energy estimates that you can read against current market prices.
Tariffs
Tariffs are a separate, simpler concept for buy and sell accounting at the meter. A plant can carry one or more tariffs over time, each describing:
- Sell rate and buy rate — feed-in and consumption rates in cents per kilowatt-hour. If you don't specify them, defaults of 5.8 ct/kWh (sell) and 28.5 ct/kWh (buy) are applied.
- Validity window — when the tariff is in force, so rate changes over time are preserved.
- Per-meter or plant-wide — a tariff can target a specific feed-in meter, or apply to the whole plant if no meter is given.
- Tariff parts — optional fractional breakdowns (for example, a portion of the rate at one price and the remainder at another), split into selling and buying parts. When you provide parts, the totals are derived from them.
Tariffs are not the market configuration
Tariffs give you a straightforward buy/sell rate per kilowatt-hour for meter-level accounting. The market configuration (EEG bands, PPA, spot/Marktwert) is the full revenue model. The two coexist and serve different purposes — don't substitute one for the other.
Who Can Configure It
Market and tariff settings follow the standard plant permission model — see the Permission System for the full role matrix.
- Reading a plant's market configuration, tariffs, and the global market prices requires only read access to the plant (any organization member with a role on it). Global market prices are readable by any active user.
- Changing the market configuration, EEG bands, PPA contracts, the grid operator, or tariffs requires modify access on the plant — at least a Moderator in the owning organization, or an equivalent job role (Operator, Technical Manager, or Asset Manager).
Distinction From Related Concepts
| Concept | What it captures | Scope | Who controls it |
|---|---|---|---|
| Market configuration | EEG bands, PPA, grid operator, settlement | Per plant | Moderator or higher |
| Tariffs | Simple buy/sell rates in ct/kWh | Per plant or per meter | Moderator or higher |
| Market prices | Spot, Marktwert, annual premium | Region-wide reference | Read-only for all |
| Service contracts | Your Mirox subscription and billing | Per organization / per plant | Admin or Moderator |
Related Features
- Accounting & Billing — organization billing contacts, SEPA mandates, e-signing, and your Mirox subscription contracts
- Reports — technical and financial reports that consume your market configuration
- Forecasts — five-day energy forecasts to read against current market prices
- Permission System — the role model that gates who can read and change market settings