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The average price at Polpaico was USD 94.8/MWh, 14% higher than last week and 38% higher than the same week last year.
Marginal cost evolution in Polpaico during past years
In the generation mix, wind share fell by 2.5 pp and solar fell by 2.4 pp. Coal increased by 2.9 pp and gas by 2.3 pp, while oil decreased by 0.7 pp.
Peak system output occurred on Friday at 1 PM, reaching 12.0 GW. The highest BESS participation was recorded on Sunday at 8 PM, when injections accounted for 15.8% of system output.
Daily operation reports showed recurring gas availability constraints, particularly at Nueva Renca and Nehuenco, due to supplier limitations.
Prices were mostly coupled during the week, although localized congestion continued to cause price decoupling on the 220 kV Charrúa–Santa Clara line on Thursday, the 220 kV Lastarria–Ciruelos line on Thursday and Friday, and the 500 kV Nueva Pan de Azúcar–Polpaico line during solar hours on several weekdays.
Oil-fired plants set the marginal price on most days, except Sunday and Wednesday. The highest reference price was USD 316.1/MWh in Puerto Montt at 11:45 PM on Friday, set by the oil-fired Los Guindos plant, based on preliminary data.
Marginal cost evolution
Crucero
USD 85.5/MWh
Cardones
USD 86.2/MWh
Pan de Azúcar
USD 87.7/MWh
Polpaico
USD 94.8/MWh
Charrúa
USD 93.1/MWh
Puerto Montt
USD 99.1/MWh
Solar and Wind production & BESS dispatch
Solar generation decreased by 39.8 GWh (-12.9%) this week. The highest solar plant factor was 16.2% in Cardones and the lowest was 5.6% in Charrúa. The system-wide solar plant factor was 12.1%.
Wind generation decreased by 40.8 GWh (-17.2%). The highest wind plant factor was 24.1% in Puerto Montt and the lowest was 12.3% in Polpaico. The system-wide wind plant factor was 17.0%.
BESS injections fell by 2.2 GWh (-2.4%); the largest injections occurred in the Crucero zone, totaling 64.9 GWh.
This week curtailment rates were 2.0% (3.6 GWh) for wind and 2.0% (5.5 GWh) for solar, resulting in a combined system-wide curtailment rate of 2.0%, down 3.7 pp from last week.
Hourly Solar production
Hourly Wind production
Hourly BESS dispatch
PV capture price
Crucero
USD 53.0/MWh
Cardones
USD 55.4/MWh
Pan de Azúcar
USD 58.0/MWh
Polpaico
USD 71.3/MWh
Charrúa
USD 73.0/MWh
Puerto Montt
USD 92.8/MWh
Energy weighted average spot price using PV production by zone
Wind capture price
Crucero
USD 81.8/MWh
Cardones
USD 71.6/MWh
Pan de Azúcar
USD 76.7/MWh
Polpaico
USD 72.0/MWh
Charrúa
USD 74.5/MWh
Puerto Montt
USD 104.2/MWh
Energy weighted average spot price using wind production by zone
BESS discharge capture price
Crucero
USD 115.0/MWh
Cardones
USD 122.1/MWh
Pan de Azúcar
USD 105.3/MWh
Polpaico
USD 116.9/MWh
Charrúa
USD 102.4/MWh
Energy weighted average spot price using BESS discharge by zone
BESS charge capture price
Crucero
USD 56.0/MWh
Cardones
USD 58.5/MWh
Pan de Azúcar
USD 74.3/MWh
Polpaico
USD 92.7/MWh
Charrúa
USD 99.1/MWh
Energy weighted average spot price using BESS charge (both from co-located power plant and from grid) by zone
