Resource Efficiency
The main resources used by the project are natural gas and water. The power plant will have a best-in-class thermal efficiency of around 60% in base-load operation. There will be three General Electric (GE) model 7HA.02 combustion turbines (CTs). These CTs are the largest and most efficient CTs offered by GE and amongst the most efficient CTs on the market, making the power plant one of the most efficient thermal power plants in Brazil and globally.
The double-circuit transmission line will operate at 500 kV. This voltage matches the highest voltage used in the regional grid. Generally, use of higher voltages for transmission results in lower line losses (higher efficiency) compared to use of lower voltages. While each circuit can handle the full output of the power plant, to optimize efficiency under normal conditions power will flow in both circuits. Based on the preliminary design the typical line loses have been estimated to be 0.4% which is considered acceptable per international industry standards. In cases where only one circuit will carry the whole power output the losses will increase to 0.79%.
Seawater will be used to meet the power plant’s most significant water demand for cooling the condensate in the steam cycle. The cooling system will use forced draft cooling towers that require less water than a once-through cooling water system to help reduce this source of water use. The FSRU will use warm ocean water as the source of heat for re-vaporization of LNG to NG. This avoids the need to use natural gas or other fuel as the source of heat, although it does contribute to use of seawater.
Water Use & Wastewater Treatment
Freshwater for construction will be sourced from an on-site deep tube wells, supplemented by water transported to worksites by tanker truck. The abstraction of fresh water is not expected to have an effect on local water supplies or water users. All sanitary wastewater and oily wastewater generated during construction of the power plant and transmission line will be collected and shipped off-site for treatment and disposal at a licenced facility. As part of ESAP action 4, the sponsor will adopt the principles of “duty of care” for off-site disposal of wastes including procedures for verifying the fate of materials removed from site.
The company will require the EPC contractor for the power plant and transmission line to protect against sedimentation and water contamination by using measures such as fencing, silt barriers, and settling ponds in the case of sediments, and secondary storage, and strict handling procedures for fuels and hazardous materials. These measures are to be specified in the EPC Contractor’s ESMP to be developed as per ESAP action 4.
Seawater will be the principle source of water for operation of the FSRU and the power plant; the transmission line will not require water. Specifically, the FSRU will take approximately 12,000 m³/h from the Atlantic Ocean and return about the same amount back to the ocean. The Power Plant will take approximately 3,600 m³/h from the ocean. Approximately 2,000 m³/h will be returned to the ocean, with the balance (approximately 1,600 m 3 /h) transferred to the atmosphere through evaporation from the power plant cooling towers.
Most of the water used by the FSRU will be for vaporization of LNG, and lesser amounts for cooling. On-board desalinization process will generate potable water and process water. The FSRU will have dedicated structures built into the hull for water uptake and wastewater discharge.
Most of the water used at the power plant will be for plant cooling. Similar to the FSRU, a desalination process will be used to generate potable water and the small amounts of process water needed by the plant. To protect aquatic life water intakes are designed to achieve water intake velocities in line with WB-EHS Guidelines. The power plant will have a 1.3 m diameter water intake pipeline that will extend 1,500m into the ocean. A 0.9 m diameter wastewater discharge pipeline will extend 1,200 m into the ocean. The end-points of the two pipelines will be located approximately 400 m apart. In compliance with applicable World Bank Group Environmental Health and Safety (WBG EHS) guidelines the project will use forced draft cooling towers to reduce the thermal discharge to the sea, and multi-port diffusers to promote rapid and efficient dispersion of the effluent in the seawater.
Hydrodynamic modeling predicts that the thermal plumes from the FSRU and from the power plant will being within 3 degrees of ambient a short distance from the discharge points. For this reason, significant effects on marine life of human heath are not expected. Similarly, the pollutant load in the wastewater streams are well within the assimilative capacity of the vast quantity of water in the nearshore area.
GHG Emissions
Combined cycle gas turbine (CCGT) power plants are the most efficient fossil fuel fired technologies available today. The CO 2 emission rate for this power plant will be about 374 gCO 2 /kWh, which is about 5 % lower than the typical emission rate for a similar plant. The emission rate for the power plant and the FSRU together is about 404 gCO 2 /kWh. It is expected that the power plant will operate as back-up power with total project generation of 6.851 million MWh/y of electricity and total greenhouse gas emissions (power plant + FSRU) of 2.768 million tCO 2 /y. The sponsor will track the greenhouse gas contributions from the power plant and FSRU and report the amounts in the projects annual environmental reporting.
Air Emissions and Ambient Air Quality
Air quality monitoring completed as part of the ESIA indicates the air-shed is non-degraded for particulate matter 10 micrometers or less in diameter (PM 10 ) and 2.5 micrometers or less in diameter (PM 2.5 ), nitrogen dioxide (NO 2 ), and sulfur dioxide (SO 2 ). Measured concentrations of these substances were all well below the applicable Brazilian regulatory limits. The monitoring also showed that concentrations of ground level ozone (O 3 ) are high, and in a few cases exceeding the applicable guideline limits. The high levels of O 3 are not expected given that concentration of precursor compounds is comparatively low. To better understand and characterize the ambient air quality and baseline conditions, CELSE will immediately supplement an ambient air quality baseline for NO, NO2, VOC and O 3 on a quarterly basis during construction. (ESAP action 17).
During the construction period emissions to air will be generated from both onshore and off shore activities. Emissions from offshore activities will consist of stack emissions from vessels involved in laying the pipeline and installing the yolk.
On-shore activities, which will take place at the power plant site, the pumphouse and pipeline corridor, and the transmission line, will result in exhaust emissions from vehicles and motorized equipment and tools. During construction, there will also be emission of particulates resulting from wind and vehicle raised dust, material handling, and construction activities such as cutting and grinding.
Key measures to limit particulate emissions include use of cover during transport of excavated earth; application of dust suppressants to internal roads, stabilizing/covering friable material prone to wind erosion, regulated vehicles speed; regular road maintenance; grading and compacting road surfaces to prevent uneven running surfaces to prevent both noise and dust impacts. In addition, mandatory preventive vehicles and equipment maintenance to reduce generation of combustions gases will be also implemented. The EPC contractor environmental management plan will detail these measures as well as the implementation procedures.
The air impacts during operation will be primarily generated through the combustion of natural gas at the power plant and FSRU both of which primarily generate NOx. Emissions of particulate mater (PM) and sulfur dioxide (SO 2 ) are considered negligible. The emission from the FSRU will meet applicable MARPOL requirements. The emissions from the power plant will meet applicable WBG EHS guidelines for emissions from gas fired combined cycle power stations. The power plant will include a continuous stack emissions monitoring system.
As part of the ESIA, the company conducted dispersion modeling to predict the effect of the project’s emissions (power plant plus FSRU) on ground level concentrations of pollutants. The modelling predicts that in the affected airshed the contribution of the plant plus background levels will be below the applicable Brazilian air quality standards for all pollutants.
As part of the ESIA the company also conducted dispersion modelling to predict the cumulative effect of the project’s emissions plus two additional, similar-sized, power plants to be located immediately north of the power plant site. The modelling predicts that in the cumulative contribution of the three plants plus background levels will remain below the applicable Brazilian air quality standards for all pollutants.
As part of ESAP action 2, the client will undertake an analysis to assess the effects of the wake from nearby wind-turbines on dispersion of emissions from the power plant stacks.
CELSE will establish and maintain an ambient air quality monitoring program during O&M that complies with WBG EHS guidelines as part of ESAP action 18.
Noise
During the construction period, noise will be generated from both onshore and off shore activities. On-shore activities will take place at the power plant site, the pumphouse and pipeline corridor, and the transmission line corridor. Noise sources will include operation of: heavy equipment such as trucks, bulldozers, compactors, cranes; stationary generators, pumps, and portable power tools such as grinders and saws. Off-shore noise sources include barges and other water craft, as well as the equipment used on the vessels. The Sponsor’s management measures include implementing a process to collect and respond to complaints about noise and requiring contractors to take measures to manage construction phase noise levels in accordance with IFC and national law noise requirements including limiting noisy activities near residences to daytime hours.
During operation, noise will be generated by the FSRU and associated visiting LNGC’s, and the power plant.
Noise from the FSRU and visiting LNGCs, which are moored far offshore, are not expected to be noticeable above existing ambient noise levels on-shore.
As part of the ESIA, the company conducted noise propagation modeling to predict the effect of the power plant’s noise emissions on off-site noise levels. The model included all major noise sources at the power plant site except for the sea-water intake pumphouse that is located offsite, near the beach in Praia do Jatoba .
The modelling predicts that noise levels in community areas will increase above the existing baseline in all of the residential areas surrounding the site for both daytime and nighttime periods. During daytime, while the change in noise may be noticeable, the noise levels will remain below, and will comply with, the project applicable daytime noise limits. However, during nighttime, the predicted noise levels may exceed the project applicable nighttime noise limits in all community area.
As part of ESAP action 19, the company will update the noise model to include noise emissions from the seawater-intake pumphouse and will carry out additional baseline measurements to confirm the project applicable noise limits. The company will then identify noise reduction measures that will result in compliance with project applicable noise limits in surrounding community area. As part of the modeling the company will also consider the cumulative effect of the two additional power plants that may be developed at the site.
Solid Waste Management
Construction of power plant and transmission line will generate large amounts of solid waste including packing materials, scrap metal, scrap wood, waste concrete, and food waste. The FSRU will be constructed at a shipyard and not result in production of wastes locally.
The sponsor will require all construction phase contractors to establish plans and procedures for managing solid wastes that fully address applicable regulations and IFC guidelines. These include use of manifests and logs to track materials, worker training, protected storage with secondary containment, one-site equipment and material for spill response and cleanup. All wastes will be segregated and properly stored in temporary on-site waste storage area managed by the EPC contractor. All wastes will be transferred off site to a properly equipped and licenced facility for treatment and disposal.
Small amounts of solid wastes will be generated during operations compared to construction. On the FSRU, solid waste will be managed in accordance with Golar’s established plans and procedures, and in accordance with the requirements of the vessels classification. All solid wastes will be segregated and stored protected from the elements. Wastes will be shipped to shore for treatment and disposal at properly equipped and licenced facilities. The Nanook will have procedures and equipment on hand to protect against and clean up spills that might occur during ship-to-ship transfers.
At the power plant, solid wastes will be managed in accordance the management plans and procedures to be developed for operations as per ESAP action 5. Permanent, dedicated facilities will be established for safe storage of solid waste.
Management of Hazardous Material
Construction and operation will require use of hazardous material such as fuels, oils and lubricants, paints, solvents, and corrosive agents.
The sponsor will require all construction phase contractors to establish plans and procedures for managing hazardous material that fully address applicable regulations and IFC guidelines. These include the use of logs to track materials, worker training, protected storage with secondary containment, one-site equipment and material for spill response and cleanup.
On the FSRU hazardous material will be managed in accordance with Golar’s established plans and procedures, and in accordance with the requirements of the vessels classification. All hazardous material will be segregated and stored protected from the elements and with secondary containment. The Nanook will have procedures and equipment on hand to protect against and clean up spills that might occur during ship to ship transfers.
At the power plant, hazardous material will be managed in accordance the management plans and procedures to be developed as per ESAP action 4. It is expected these plans and procedures will be based on well establish plans and procedures of GE. Permanent, dedicated facilities will be established for safe storage of hazardous material that meet applicable regulations and IFC guidelines. This include providing secondary containment for hazardous materials, including any transformers that contain oil, ventilation, signage, personal protective equipment including eye-wash and shower stations, and worker training.
FSRU Pollution Prevention Measures
The FSRU and the port service vessels retained for the project conform with and are certified to IMO MARPOL (Marine Pollution Prevention) standards for waste management and pollution control. The vessel was designed, constructed and is audited to all applicable classification society, IMO and other relevant body practices and standards.
Golar, the owner and operator of the FSRU, has an established environmental management system that has been certified as complying with ISO 14001:2004. The management system applies to Golar’s fleet, which currently consists of 21 vessels. Golar shall update the management system to incorporate the Nanook.
Waste management plans for the handling and disposal of non-hazardous, hazardous and liquid wastes are consistent with and are certified to MARPOL requirements. This includes, although is not necessarily limited to, the shipment-to-shore for disposal of all hazardous and non-hazardous solid waste material and the treatment and disposal of sewage waters and oily waters. In line with IMO requirements, GOLAR ensures segregated handling and storage of all hazardous materials is standard practice.
The FSRU and port service vessels meet IMO dry docking requirements, also ensuring that tributyltin (TBT) containing anti-fouling paints are not used as per IMO regulations. Golar does not use ozone-depleting refrigerants on their vessels. The Nanook has a Green Passport, as noted in its classification, which refers to a detailed inventory being made during construction of all equipment to confirm that no hazardous or prohibited materials were used in the construction of the vessel.
The FSRU is fitted with Segregated Ballast Tank systems with water discharge systems being certified to IMO International Oil Pollution Prevention (IOPP) requirements. Air emissions are managed and certified to the IMO International Air Pollution Prevention (IAPP) standards in accordance to current guidelines and requirements.
Shipboard Oil Pollution Emergency Plans (SOPEP) are available for each vessel as required by the ISM Code. These emergency plans contain the oil and/ or chemical spill contingency arrangements in place and the response to be implemented in the event of a spill. Golar has not experienced any material spill incidents in their operational history.
The vessel complies with the IMO’s International Energy Efficiency Certificate requirements. The certificate requires the FSRU’s Energy Efficiency Design Index (EEDI) meets the requirements set by the revisions to MARPOL annex IV (January 1, 2013). The amendment sets mandatory limits to greenhouse gas emissions from shipping. In addition, the International energy efficiency certificate certifies that the vessel has a Ship Energy Efficiency Management Plan (SEEMP) on board, a mandatory requirement. The SEEMP informs a vessel owner on where improvements to the operational efficiency of a vessel, in a cost-effective manner, can be made over the course of a vessel's lifespan.