En particulier, si le courant et la tension sont des fonctions sinusoïdales du temps, le facteur de puissance est égal au cosinus du déphasage entre le courant et la tension.

http://fr.wikipedia.org/wiki/Cosinus_Phi

The power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit,[1][2] and is a dimensionless number between 0 and 1. Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power.
:
The power factor is defined as: [formule] P/S
If phi is the phase angle between the current and voltage, then the power factor is equal to the cosine of the angle, cos phi,
http://en.wikipedia.org/wiki/Power_factor

So we do not talk about „power factor“ as this is translated by „facteur de puissance“, but about the cos phi of the installation.

By the way, I assume that „N°

Situation
Puissance apparente(kVA)
Cos phi installation
Puissance active (kW)
hiver
1
2 GE en attente hiver
are the headers of the corresponding columns.

Reason for highest confidence level: I am electrical engineer (electrical power engineering) since 1972.

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Note added at 16 hrs (2012-12-29 21:19:03 GMT)
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Annex: Please replace the word "phi" with the corresponding greek symbol. Was unable to enter this.