Nuclear indicators

Transparency

In 2023, installed nuclear power capacity corresponded to 5% of the Group's total installed capacity. Electricity production from nuclear power accounted for 14.1% of total production (excluding steam generation) and sales from nuclear power production are less than 2% of the Group's total sales.

Unplanned automatic shutdowns for every 7000 H*

(WANO UA7)

*Iberdrola joint value calculated on the WANO UA7 (24 months) indicators of nuclear power plants weighted by Iberdrola share power and ownership. Indicator does not take into account the Sta. María de Garoña NPP which was not included on WANO indicators during 2013.

Year	Automatic shutdowns
2013	0.54
2014	0.51
2015	0.24
2016	0.16
2017	0.20
2018	0.08
2019	0.18
2020	0.30
2021	0.49
2022	0.64
2023	0.68

Number of notified events by type according INES Scale*

Annual values depend much on the number of refueling outages within the year and are subjected to normal statistical fluctuations.

*Iberdrola joint value calculated on the events notified by nuclear power plants weighted by Iberdrola share power and ownership. Notified events according to the Safety Instructions IS-10 of the Nuclear Safety Council

YEAR	N0	N1
2013	4.7	0.1
2014	5.7	0
2015	4.4	0.1
2016	5.6	0.3
2017	2.0	0.3
2018	5.5	0.3
2019	4.8	0
2020	3.8	0.1
2021	1.9	0.1
2022	4.5	0.6
2023	5.0	0.3

Public Collective Dose IB Fleet (Public) (mSv*Person)

* Collective dose received by all the inhabitants of the population closest to the plant, weighted by Iberdrola's Power, considering that all the inhabitants have received the same dose as that of the critical individual (fictitious person who receives the maximum envelope dose of the of any person living in the area.) The dose received by the critical individual is calculated by the radiological protection services of each plant and is published in the monthly operating report, which is controlled by the regulator (CSN). people is obtained from the data published by the National Institute of Statistics (INE). The values depend on the number of recharges made in the year.

YEAR	PUBLIC COLLECTIVE DOSE (mSv*Person)
2019	0.69
2020	0.56
2021	1.07
2022	0.83
2023	1.71

Collective dose (WANO CRE) (Workers) Sv-Person*

Variations of this indicator depend on the number and lenght of refueling outages within the year. Actions continue to be taken to optimize the collective dose

*Iberdrola joint value calculated on the WANO CRE indicators of nuclear power plants weighted by Iberdrola share power and ownership and considering its fuel cycle. Indicator does not take into account the Sta. Mª de Garoña NPP which it is not included in WANO indicators since 2013.

YEAR	COLLECTIVE DOSE (Sv-Person)
2013	0.71
2014	0.7
2015	0.72
2016	0.69
2017	0.64
2018	0.71
2019	0.67
2020	0.52
2021	0.53
2022	0.51
2023	0.52

Generated and conditioned waste of low and medium activity (m³)

Annual values depend on the number of refueling outages within the year and are subjected to normal statistical fluctuations

*Iberdrola joint value calculated on the amount of generated waste of low and medium activity and packed in each plant weighted by Iberdrola share power and ownership.

YEAR	GENERATED AND CONDITIONED WASTE OF LOW AND MEDIUM ACTIVITY (m3)
2013	129.7
2014	121.8
2015	132.3
2016	150.4
2017	150.8
2018	147.2
2019	152.4
2020	109.4
2021	144.5
2022	125.1
2023	114.9

Generated and conditioned waste of low activity (m³)

*Iberdrola joint value calculated on the amount of generated waste of low activity and packed in each plant weighted by Iberdrola share power and ownership.

YEAR	GENERATED AND CONDITIONED WASTE OF LOW ACTIVITY (m3)
2019	99.13
2020	67.97
2021	93.50
2022	69.87
2023	56.14

Generated and conditioned waste of medium activity (m³)

*Iberdrola joint value calculated on the amount of generated waste of medium activity and packed in each plant weighted by Iberdrola share power and ownership.

YEAR	GENERATED AND CONDITIONED WASTE OF MEDIUM ACTIVITY (m3)
2019	53.22
2020	41.45
2021	51.02
2022	55.24
2023	58.72

High-level waste generated annually (Spent Fuel) (tU Initial)*

Cumulative value obviously increases every year and annual value fluctuates because it depends much on the number of refueling outages within the year

*Iberdrola joint value calculated on the amount of initial U of each element discharged annually in the fuel pool at each plant weighted by Iberdrola share power and ownership.

YEAR	ANNUAL SPENT FUEL (tU Initial)
2013	21
2014	13
2015	25
2016	16
2017	23
2018	14
2019	25
2020	9
2021	28
2022	12
2023	18

Cumulative spent fuel (tU Initial)*

Cumulative value obviously increases every year and annual value fluctuates annualy because depend much on the number of refueling outages within the year

*Iberdrola joint value calculated on the amount of initial U of each element in the fuel pool at each plant weighted by Iberdrola share power and ownership.

YEAR	CUMULATIVE SPENT FUEL (tU Initial)
2013	596
2014	609
2015	634
2016	650
2017	673
2018	688
2019	713
2020	722
2021	750
2022	762
2023	773

Volume of radioactive operational waste per year (m³)*

	2019	2020	2021	2022	2023
High radioactive waste (spent fuel)	1.3	0.5	1.1	0.8	0.9
Medium radioactive waste	53.2	41.5	51.0	55.2	58.7
Low radioactive waste	99.1	68	93.5	69.9	56.1
Medium and low combined	152.3	109.4	144.5	125.1	114.9
Aggregate of all thre types of radioactive wastes	153.7	109.9	145.6	125.9	115.8

*Values for Iberdrola calculated by taking the individualvalues of each type of waste generated at each power plant, weighted by Iberdrola share power and ownership.

Amount of decommissioning waste (m³)

Increase in 2015 value is due to AVANGRID operation (Ownership percentage has raised from 9 % to 15.5 % in Connecticut Yankee Atomic)

*Spent Fuel from Maine Yankee, Yankee Rowe and Connecticut Yankee is considered in this indicator. These spent fuel elements are stored in one ISFSI per site, waiting for USA Federal Government to remove it.

YEAR	AMOUNT OF DECOMMISSIONING WASTE (m3)
2013	2,031
2014	2,031
2015	2,202
2016	2,202
2017	2,202
2018	2,202
2019	2,202
2020	2,202
2021	2,202
2022	2,202
2023	2,202