The largest volume of water we withdraw from water bodies is seawater for cooling purposes and this is confined to our fossil fuel-based power stations. The majority of this water is safely discharged back to source after appropriate treatment to minimise the environmental impact.
Our facilities monitor their total water withdrawal and discharge. The quantity of Water withdrawal and discharge in CLP’s operations is dominated by thermal plants using once through seawater cooling where very large quantities of seawater are used for cooling and returned to the sea with only slight increase in temperature. In 2017 FCG II commenced operation and Tallawarra had higher generation and these operations resulted in an overall increase in water use.
The water intensity of our power generation process in 2017 of 1.07 m3/MWh, was similar to 1.05 m3/MWh in 2016. The amount of water we are able to recycle depends on factors such as location, power station design, and regulatory requirements. We encourage our power stations to track their total water recycling and report this for indicative purposes.
We manage our water resource risks through a number of means. We assess water availability in the planning stage of projects including the likelihood of water scarcity in the future and during plant operations, we ensure that all requirements and necessary engagements with local stakeholders are in place to maintain our licence to operate. As a result of the water treatment processes we have put in place at our power stations, none of our operations significantly impact the respective water receiving bodies.
Water conservation initiatives
Our power stations, in particular our fossil-fuel fleet which uses more water, have carried out a range of water conservation initiatives depending on site-specific conditions, operational situations and age. Some new initiatives in 2017 were:
- Jhajjar Power Station, India – In 2017, the cooling water system at Jhajjar was optimised. Combined with improved efficiency brought by higher plant load, raw water consumption dropped by 9% and water recirculation increased by 14% respectively in 2017 compared to 2016.
- Fangghenggang Power Station, Mainland China – A water recycling system has been installed to collect used water from the coal yard. The water is treated and used for suppressing the dust of the coal stock and general cleaning.
We also place high emphasis on learning and sharing across CLP Group, so that all our business units can benefit from an individual power station’s efforts and experience.
We monitor our waste generation by tracking the amount of both solid and liquid forms of hazardous and non-hazardous waste produced and recycled by our facilities on an annual basis.
All hazardous waste is transported locally for disposal according to local regulations, collected by licensed collectors, or sold for reuse. The amount of hazardous and non-hazardous waste we produced and recycled are summarised below.
No significant spill was reported in 2017.
Our total solid waste increased to 21,191T in 2017 because of construction at our Black Point Power Station in Hong Kong. We continue to sell our generation by-products such as ashes and gypsum for use in other industries.
Waste management programmes
During the year, our power stations run different programmes to manage waste, and learning is shared with both our colleagues and contractors to raise awareness and build capacity. Examples of our programmes in 2017 included:
- Some of our older power stations using materials which were at the time deemed efficient, but later classified as hazardous and so replacement programmes are implemented. For example, at Castle Peak Power Station, we have been replacing HCFCs in air conditioners and HVAC chillers in a rolling programme. Seventy-three air conditioners and three chillers were replaced in 2017.
- At Jhajjar Power Station in India, an oil filtering system was installed in the middle of the year, through which approximately 11,000 litres of oil was filtered and reused in 2017.
The quantity of spent nuclear fuel produced by GNPS for the past several years is presented here. Quantities were similar in 2015 and 2017 as there was only one planned refuelling outage, while there were two in 2016.