3.0TD Tariff Summary
What Is 3.0TD?
The mandatory tariff for any supply point requiring more than 15kW of power.
Who Uses 3.0TD?
Apartment blocks, urbanisations, and large residential complexes.
Why 3.0TD?
Allows for complex infrastructure like multiple lifts and communal pools.
Contracted Power
You specify a separate power limit (kW) for each of the 6 time periods.
What Is a 3.0TD Tariff?
Commercial Structure
3.0TD is a commercial-grade electricity tariff. While the supply may power residential common areas, the contract is tied to the community's CIF (Tax ID) and follows commercial market rules.
CNMC Reform
Introduced in June 2021 by the CNMC, 3.0TD replaced the old 3.0A and 3.1A tariffs to create a more granular, time-of-use pricing model for larger consumers.
6-Period Complexity
Unlike domestic 2.0TD tariffs with 3 periods, 3.0TD uses 6 distinct periods for both energy (consumption) and power (capacity), varying by month and region.
Who Uses 3.0TD Tariffs?
Apartment Communities
Standard blocks with lifts, communal lighting, and security systems.
Urbanisations
Large complexes with extensive garden lighting and communal pools.
Commercial Blocks
Mixed-use buildings with offices and residential units sharing a supply.
Gated Communities
Developments with guardhouses, electric gates, and CCTV networks.
Understanding P1 to P6 Electricity Periods
The 3.0TD tariff splits the year into four 'seasons' and the day into 6 time periods. These periods dictate both the price of energy and the cost of your standing capacity.
| Period | Cost Profile | Typical Timing |
|---|---|---|
| P1 | Highest (Peak) | Morning (09-14h) & Evening (18-22h) |
| P2 | High | Mid-day (14-18h) |
| P3 | Medium | Early morning & late night |
| P4-P5 | Low | Specific transition months |
| P6 | Minimum (Off-Peak) | 00:00 - 08:00, Weekends, Holidays |
Contracted Power (Potencia) Explained
Optimization Potential
Optimizing the 'Potencia Contratada' is often the single largest saving on a community bill, reducing the standing charge by up to 30%.
Demand Charges & Standing Costs
Excess Power Penalties
Fixed vs Indexed 3.0TD Tariffs
Fixed 3.0TD
- Budget certainty
- Known cost per kWh
- Highest supplier margins
- No benefit from solar peaks
Indexed 3.0TD
- Market-based transparency
- Typically 15% cheaper annually
- Lower supplier fees
- Monthly price fluctuations
Adjustment Services & Hidden Costs
How Communities Commonly Overpay
Oversized Potencia
Contracting power based on the building's electrical project rather than real usage.
Peak Period Usage
Running pool pumps during P1 morning peak hours.
Reactive Energy
Paying fines for 'dirty' power caused by old elevator motors.
Real 3.0TD Case Studies
Annual Bill Reduction
Annual Bill Reduction
Annual Bill Reduction
Annual Bill Reduction
How Communities Optimise 3.0TD
Common 3.0TD Mistakes
The '15kW Rule' Misconception
Thinking you can just contract 14.9kW to save money. If you need 15kW+, 3.0TD is mandatory.
Ignoring Standing Charges
Focusing only on the price per kWh while the fixed costs remain unoptimized.
3.0TD Technical FAQ
Deep technical answers for community energy managers.
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