ahorr.ai · Blog
Electricity Bill with Self-Consumption: Compensation and Fixed Terms Autopsy
Respuesta rápida
Your electricity bill remains high because surplus compensation only
En 30 segundos
- ✓Locate the 'Potencia Contratada' section and compare it with your peak usage in the distributor's portal.
- ✓Check the 'Excedentes' (Surplus) line to see the price per kWh your provider pays you.
- ✓Identify any 'Servicios Adicionales' or maintenance fees that don't relate to energy consumption.
Is your solar investment underperforming?
Upload your bill and get a forensic breakdown of your fixed terms and surplus compensation in 30 seconds.
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- Free and no signup
- AI trained on the Spanish market (~30s)
- Privacy-first: ephemeral processing (we don't store your bills)
Transparencia y fuentes
Authorship, methodology and official sources.
Actualizado: 10 de enero de 2026
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Transparencia y fuentes
Authorship, methodology and official sources.
Actualizado: 10 de enero de 2026
Autoría
Equipo ahorr.ai
Auditoría energética (España)
Metodología orientada a decisión: separar coste fijo/variable, detectar extras y comparar opciones con números claros.
Metodología
- →Separamos coste fijo (potencia/término fijo), energía y cargos/impuestos.
- →Buscamos sobrecostes típicos: potencia sobredimensionada, servicios extra, lecturas estimadas.
- →Damos pasos accionables (qué tocar primero) con ejemplos orientativos, no promesas.
- →Enlazamos fuentes oficiales y marcamos lo que puede variar por comercializadora.
Información orientativa (España). Comprueba condiciones con tu comercializadora: precios, peajes, cargos e impuestos pueden variar.
Typical Causes (And How They Appear in the Breakdown)
Understanding your bill requires looking past the total amount and into the specific line items.
Fixed vs Variable
Your bill is split into the fixed term (power and taxes) and the variable term (energy consumed). Solar panels primarily reduce the variable term. If your fixed term is too high, your savings will always have a ceiling.
Invisible Extras
Many providers sneak in 'protection' or 'emergency' services. In a self-consumption setup, these 'vampire' costs often negate the financial benefit of the energy you export to the grid.
What to Review in Your Bill (The Paper Trail)
To diagnose the health of your installation's ROI, you need to track these specific numbers.
- →The 'Facturación por potencia' line: Are you paying for more than you use?
- →The 'Descuento por excedentes': Is the price per kWh fair (usually >0.08€/kWh)?
- →The 'Cargos y Peajes': These are regulated but can be optimized by adjusting your profile.
Real Case: The Culprit Wasn't the kWh
In our forensic audits, we often find that the price of energy is secondary to the structure of the contract.
The Clue
A user noticed that even in summer with maximum production, their bill never dropped below 40€. The autopsy showed 4.6 kW contracted while their inverter logs showed they never drew more than 2.5 kW from the grid.
The Correction
By lowering the power to 3.3 kW and removing a 7€ maintenance fee, the user saved over 150€ per year without changing their consumption habits.
Quick Solution: Autopsy with ahorr.ai
Stop guessing and let technology do the forensic work for you.
What it Detects
Our IA scans for oversized power, hidden services, and compares your surplus compensation against the 'Price Guardian' database of current Spanish rates.
What You Do with the Report
You receive a clear PDF with specific actions: 'Lower power to X', 'Cancel service Y', or 'Switch to provider Z for better surplus rates'.
Checklist for Electricity Bills with Self-Consumption
- ✓Locate the 'Potencia Contratada' section and compare it with your peak usage in the distributor's portal.
- ✓Check the 'Excedentes' (Surplus) line to see the price per kWh your provider pays you.
- ✓Identify any 'Servicios Adicionales' or maintenance fees that don't relate to energy consumption.
- ✓Verify the 'Término Fijo' cost; this is paid regardless of how much solar energy you produce.
- ✓Compare your surplus compensation rate against the current PVPC or free market average.
- ✓Decide if a 'Virtual Battery' service would be more profitable than simple surplus compensation.
Symptoms of an Inefficient Self-Consumption Bill
| Symptom | Likely Culprit | Recommended Action |
|---|---|---|
| High bill despite high production | Oversized Contracted Power | Lower your kW power setting |
| Surplus credit is very low | Poor Compensation Rate | Switch to a provider with better surplus prices |
| Fixed costs exceed 30€ | Hidden Maintenance Services | Cancel non-essential insurance or services |
| Negative balance not possible | Lack of Virtual Battery | Look for 'Hucha Solar' or Virtual Battery plans |
Fixed terms cannot be compensated below zero unless you use a Virtual Battery service.
The Case of the Oversized Power: A 90m² Apartment Story
A family living in a 90m² apartment with a recent solar installation couldn't understand why they were still paying over 60€ a month. They had 4.6 kW of contracted power, but their actual peak usage never exceeded 2.8 kW. Additionally, they were being charged 6.99€/month for a 'maintenance service' they didn't need, effectively pushing their cost to 0.23€/kWh despite having panels.
Hallazgos
- ✓Contracted power was 1.8 kW above their actual needs.
- ✓Hidden maintenance service fees were eating up the surplus compensation.
- ✓Effective price per kWh was significantly higher than market alternatives.
No bill handy?
You can still create a profile to monitor market prices and receive alerts when a better surplus rate appears.
Related guides
Preguntas frecuentes
Privacy-First Auditing
We don't store your data. No commercials will call you. Just pure data for your decision-making.
Disclaimers
- Informational tool; not financial advice.
- We don’t guarantee savings: these are estimates.