Sustainability Report ENEVA 2020
In 2020, we maintained the direct water withdrawal from the Mearim River
(which is why we are part of the Mearim River Hydrographic Basin Committee),
for the Parnaíba Complex, and from the São Marcos Bay, for the Itaqui TPP,
both located in the state of Maranhão. At the Pecém II plant, we have
maintained the use of water supplied by the Ceará Water Resources
Management Company, COGERH. One highlight is the maintenance of high
rates of water recycling in the cooling towers of Pecém II (with up to 15
recycles), due to our insertion in a water-stressed zone, dependent on the
water stored in the Castanhão weir.
In the Parnaíba Complex, there is also underground water withdrawal in
specific and transitory situations, in order to guarantee the project's operational
safety. Thus, in cases of a sudden shutdown of the adductor, along its course
of 27 kilometers from the Mearim River to the plants, the water wells are
activated. In all cases, we strictly comply with the operational and legal
requirements set forth in the concession, monitoring the withdrawn flow
and performing all legal analyses of water quality, both at the entrance and
at the exit of the operations.
In 2020, including power generation, E&P and construction, 11,223 ML of new
water was withdrawn, 17% less than 2019, a reflection of the reduction in
merit order dispatch. The main source of use continued to be seawater, as
well as the main use in power generation activities. Water consumption,
which is mainly through evaporation in the cooling towers of the plants, was
7,810 ML in 2020.
The rate of new water withdrawal in energy generation activities has also
been reduced by 6% when comparing the volumes withdrawn for each MWh
generated. This decrease is due to the increased share of gas in the composition
of the dispatch, according to the merit order of the national system operator.
9.4.1.2
Water/Effluent Disposal
[GRI 303-4 | OG5 | IF-EU-140A.1]
In all operations with disposal of water or effluents, we have
established controls so that this activity is carried out following
our internal guidelines and federal, state, and municipal legislation,
with emphasis on compliance with Conama Resolution 430/2011
on the disposal of effluents. Our commitment is to guarantee
the return of water in adequate and healthy conditions for the
environment and the population, although there are no water
discharges or runoffs that significantly affect bodies of water,
habitats, or areas with high environmental sensitivity.
The disposal of sanitary and oil effluents occurs by means of
specialized companies contracted. In addition, we have our own
Effluent Treatment Stations (ETE) and effluent monitoring and
quality control programs before final disposal.
In 2020, 3,439 ML of effluents were generated, considering all
activities (power generation, E&P and construction sites).
Effluent Generation
Total (ML)
6.203
5.191
3.439
2018
2019
2020
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INTELLECTUAL &
ORGANIZATIONAL
CAPITAL
MANUFACTURED
HUMAN
CAPITAL
CAPITAL
SUSTAINABILITY REPORT ENEVA 2020
Effluent generation by source
2020 (ML)
Water Disposal
2020 (ML)
[GRI 303-4 | IF-EU-140A.1]
(ML)
2020
(ML)
Industrial
2.4
Surface water
2020
880.9
Oil
1.6
Reinjection in a gas well
6.4
Sanitary
16.0
Seawater
2,532.3
Cooling water
3,413.2
Produced water
6.4
Water for third parties
20.0
Total
3,439.6
Total
3,439.6
Effluent Generation
by source (ML) 2020
99.23%
Cooling water
O
0.19%
Industrial
0.07%
Produced water
0.05%
Oil
0.47%
Sanitary
SOCIAL &
RELATIONSHIP
CAPITAL
Effluent generation in
generation assets
Intensity (ML/MWh)
0.69
0.57
0.43
2018
2019
2020
NATURAL
CAPITAL
FINANCIAL
CAPITAL
APPENDICES
GRI
CONTENT
INDEX
SASB
CONTENT
INDEX
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