Source: http://sitepasite.free.fr/montagne/info_4_pique.html
I share them here because I had a little trouble finding them (nothing on wiki for example on the charging rate per station)
Portillon power station (1150m)
Commissioned 1941
Head height on gate side 1420m (highest in France), flow 5m³ / s, power 55MW, annual output 54GWh
Drop height Blue Lake side 1120m, flow 4.6m³ / s, power 40MW, annual production 14GWh
Prat-Long pumping station (2232m) (pumps water from Blue Lake to Portillon Lake)
Commissioned 1946
Delivery head 280m, Delivery rate 2.2m³ / s
Annual flow pumped 11 hm³
Annual consumption 10 GWh
Central of the Upper Pique (860m)
Commissioned 1919
Drop height 232m, flow 6.5m³ / s, power 10.8 MW, annual production 42 GWh
Central of the Lower Pique (660m)
Commissioned 1918
Drop height 171m, flow 5.2m³ / s, power 7.2 MW, annual production 37 GWh
Lake Oo powerhouse (640m)
Commissioned 1921
Fall height 802m, flow rate 4.75m³ / s, power 30MW, annual output 62GWh
Portillon Lake (2566m)
Natural lake enhanced by a dam 22m high and 205m long
Reservoir volume 16.8 hm³, annually 18 hm³ are turbinated and 11 hm³ injected by pumping from Lac Bleu
Lake Oo (1500m)
Natural lake enhanced by a dam 11m high and 66m long
Reservoir volume 13 hm³, annually 33 hm³ are turbinated
We can therefore estimate the load factors for each of these examples:
power 55MW, annual production 54GWh or 54 / 000 = 55h per year at nominal power
power 40MW, annual production 14GWh or 14 / 000 = 40h
power 10.8 MW, annual production 42 GWh or 42 / 000 = 10.8h
power 7.2 MW, annual production 37 GWh or 37 / 000 = 7.2h
power 30MW, annual production 62GWh i.e. 62 / 000 = 30h
Either in% of an hour at nominal power / hours of the year:
982 / 8760 = 11.2%
350 / 8760 = 4%
3888 / 8760 = 44.4%
5140 / 8760 = 58.7%
2067 / 8760 = 23.6%
Average = 28.4% (so not too bad)
We therefore see that the load rate is very variable, necessarily dependent on the hydraulic resource but also may be on local demand (hydraulic plants are currently used to compensate for peak current demand)