Investor Presentaiton
eneva
Water and effluents
GRI 103.1, 103-2, 103-3 - Protection and management of
water resources | 303-1 | 303-2 | 303-3 | 303-4 | 303-5 |
IF-EU-140a.1 | IF-EU-140a.3 | OG5
Our generation assets represent the largest
volume of water abstraction and consumption.
The input is fundamental for this activity and
used, with less relevance, in the activities of
exploration and production of hydrocarbons.
In thermal generators, the average consumption
can vary according to the type of cycle and
cooling technology used, the humidity and
ambient temperature, in addition to the chemical
and physical characteristics of the water
collected, with the cooling of the water-steam
cycle being the biggest consumer. For this reason,
all our plants that use water for cooling have a
recycle system, allowing the reuse of water in its
liquid state. We highlight the case of TPP Pecém
II, which has the highest salt concentration cycle,
which can reach up to 15x, achieving a substantial
reduction in water consumption.
The main impact associated with use is the
concentration of salinity and chlorine in generation
and, in the case of E&P, chemicals in well drilling.
Thus, due to the importance in our production
process and for the surrounding communities, for
the development and conception of our assets,
we conduct extensive studies of water availability
and of the support capacity for effluent disposal.
These studies guide us in the correct adoption
of technologies compatible with the availability
of the territories in which we operate. The TPP
Jaguatirica II will be the first in Brazil with Air
Cooled Condenser (ACC) technology for cooling the
water-vapor cycle. In this process, hot air cooling
occurs with thermal exchanges with atmospheric
air by means of fans, without significant water
consumption.
In addition, in 2021 we adopted new KPIs in the
Water Resources and Effluents Management
procedure, as a result of the procedure published
in 2020, in order to improve traceability,
management performance and monitoring
processes. The current indicators include data
from:
> New water collected and reused, broken down
by source (m³);
> Total water consumption (m³);
> Water abstraction rate (m³/MWh);
> Volume of effluents generated, broken down by
type (m³);
> Industrial effluent generation rate (m³/MWh);
> Deviation in the monitoring of effluents in the
control with external releases (number of legal
violation).
8%
reduction in the intensity of new
water abstraction, compared to
2020
The indicators are used for critical performance
analyses by specific committees, carried
out regularly and used as a decision-making
instrument. All our operational units apply a
Control and Monitoring Plan for Water Resources
and Effluents, considering the licenses and
authorizations for the activity and the appropriate
legislation. The monitoring data reveals if the
industrial activity alters the quality or availability
of the water resource, and any eventual deviation
is formally registered in the Redmine System
and dealt with through preventive and corrective
actions designed to avoid recurrence.
sustainability report 2021
97 >
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