What is the GDMTH tariff?
It is CFE’s tariff for large consumers connected at medium voltage. It has three time bands with different energy prices (base, intermediate and peak) and charges for the demand your plant registers.
What are the base, intermediate and peak bands?
| Band | When | Charge (Norte, July 2026) |
|---|---|---|
| Base | Early morning, the cheapest band | MXN 0.9908/kWh |
| Intermediate | Most of the day | MXN 1.5710/kWh |
| Peak | The most expensive band: 18:00 to 22:00 in winter, in the Norte division | MXN 1.8372/kWh, 85 % more than base |
What is billable demand?
It is the demand in kW that CFE charges you. It is driven by your maximum demand during peak hours: the higher your peak in that band, the more you pay.
How are the capacity and distribution charges calculated?
| Charge | How it is calculated | Norte, July 2026 |
|---|---|---|
| Capacity | On your billable demand | MXN 386.37/kW |
| Distribution | On the maximum measured demand, with a cap | MXN 72.92/kW |
What does power factor cost?
If your power factor is below 90 %, CFE adds a surcharge; above 90 %, it gives you a credit. Separately, the Grid Code has required 0.97 since April 2026 for medium-voltage plants of 1 MW or more.
Which charges does a BESS lower?
- Peak energy: the BESS discharges in that band and your plant draws from the batteries. This is the main source of savings.
- Capacity: by cutting peak demand, billable demand falls and this charge with it.
- Distribution: falls as the maximum demand registered by the meter falls.
- Power factor: the inverter compensates reactive power continuously: a surcharge is reduced or becomes a credit, and an existing credit grows.
- Base energy: rises slightly, because the BESS charges its batteries in that band, when energy costs less.
Go to the Ollin Platform and sign up to simulate your real savings with an ENEGRIN BESS.
Sources
- CFE, GDMTH tariff, Norte division, July 2026 (charges published by CFE).
- CRE, Grid Code, RES/550/2021 (DOF, December 31, 2021).