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Guide · Grid Code

Grid Code: the 0.97 power factor required since April 2026

Since April 8, 2026, Mexico’s Grid Code (CRE, RES/550/2021) requires a power factor between 0.97 lagging and 1.0. It applies to medium-voltage plants with a contracted demand of 1 MW or more, and to all high-voltage plants. It is measured every five minutes and must be met at least 95 % of the time each month.

What is power factor?

It shows how much of the energy your plant draws is turned into useful work. Motors, compressors and transformers also draw reactive energy (kVArh), which does no work and lowers the power factor.

What does the Grid Code require?

  • A power factor between 0.97 lagging and 1.0.
  • Measurement every five minutes.
  • Compliance at least 95 % of the time each month.
  • In force since April 8, 2026.

Who does it apply to?

Medium-voltage plants with a contracted demand of 1 MW or more, and all high-voltage plants.

What does the CFE tariff charge for power factor?

This is separate from the Grid Code. If your power factor is below 90 %, CFE adds a surcharge to your bill; above 90 %, it gives you a credit.

See every GDMTH tariff charge

How does a BESS solve it?

The BESS inverter compensates reactive power continuously, so it helps sustain the power factor the Grid Code requires. On the bill, a surcharge is reduced or becomes a credit, and an existing credit grows. We measure how much of the savings comes from this, and you see it separately in your reconciliation.

How the BESS works

Go to the Ollin Platform and sign up to simulate your real savings with an ENEGRIN BESS.

Simulate my savings

Sources

  1. CRE, Grid Code, RES/550/2021 (DOF, December 31, 2021).
  2. CFE, GDMTH tariff: power factor surcharge and credit.