Steam study on power plant water usage
According to the U.S. Department of the Interior, for the first time since 1995 the U.S. Geological Survey will reinstate reporting the amount of water consumed in the production of thermoelectric power.
Tracking the consumptive use of water by thermoelectric power plants could allow water resource managers to evaluate the influence of this type of use on the overall water budget of a watershed. The use of heat and water budgets to estimate water consumption at individual thermoelectric plants provides a useful check on other estimation approaches and in many cases may be the most accurate method available.
Thermoelectric water withdrawal is the water removed from groundwater or surface water for use in a thermoelectric power plant, mainly for cooling purposes. Much of the water that is currently withdrawn for cooling is reintroduced into the environment, and immediately available for reuse.
The consumptive use occurs when some of the water is evaporated during the cooling process or incorporated into byproducts as a result of the production of electricity from heat. Once the water is consumed, it is no longer able to be reintroduced into the environment.
"Thermoelectric withdrawal occurs in both freshwater and saline water sources," says Eric J. Evenson, coordinator, and USGS National Water Census. "It is the most significant use of saline water in the country."
Learn more at:
- Methods for Estimating Water Consumption for Thermoelectric Power Plants in the United States
- Tennessee Water Science Center
- National Water Census
- Progress Toward Establishing a National Assessment of Water Availability and Use
This study presents a method for collecting location and cooling-equipment data. An upcoming study will be released providing the consumption numbers derived from our heat/water budget models. About half of the water withdrawals in the United States are for thermoelectric cooling water, however, most of the water is returned to the environment after use.
The methods for estimating evaporation presented in this study will play a key role in the National Water Census, a USGS research program on national water availability and use that develops new water accounting tools and assesses water availability at the regional and national scales.
"The most significant contribution of this report," according to Diehl, "is to present an updated method for estimating evaporation from surface water downstream from once-through cooling systems, and make the tool available in the form of a spreadsheet."
The USGS classifies water withdrawals for thermoelectric cooling by the two types of cooling systems used at the plants: recirculating systems and once-through systems.
A recirculating cooling system circulates water through the generating plant condensers and is then cooled in a structure such as a cooling tower or cooling pond, before it is re-used in the same process. A once-through cooling system withdraws water from a surface-water source to circulate through the generating plant condensers and then discharges the water back to surface water at a higher temperature.
Hydrostor receives $4m funding for A-CAES facility in Canada
Hydrostor has received $4m funding to develop a 300-500MW Advanced Compressed Air Energy Storage (A-CAES) facility in Canada.
The funding will be used to complete essential engineering and planning, and enable Hydrostor to plan construction.
The project will be modeled on Hydrostor’s commercially operating Goderich storage facility, providing up to 12 hours of energy storage.
Hydrostor’s A-CAES system supports Canada’s green economic transition by designing, building, and operating emissions-free energy storage facilities, and employing people, suppliers, and technologies from the oil and gas sector.
The Honorable Seamus O’Regan, Jr. Minister of Natural Resources, said: “Investing in clean technology will lower emissions and increase our competitiveness. This is how we get to net zero by 2050.”
A-CAES has the potential to lower greenhouse gas emissions by enabling the transition to a cleaner and more flexible electricity grid. Specifically, the low-impact and cost-effective technology will reduce the use of fossil fuels and will provide reliable and bankable energy storage solutions for utilities and regulators, while integrating renewable energy for sustainable growth.
Curtis VanWalleghem, Hydrostor’s Chief Executive Officer, said: “We are grateful for the federal government’s support of our long duration energy storage solution that is critical to enabling the clean energy transition. This made-in-Canada solution, with the support of NRCan and Sustainable Development Technology Canada, is ready to be widely deployed within Canada and globally to lower electricity rates and decarbonize the electricity sector."
The Rosamond A-CAES 500MW Project is under advanced development and targeting a 2024 launch. It is designed to turn California’s growing solar and wind resources into on-demand peak capacity while allowing for closure of fossil fuel generating stations.
Hydrostor closed US$37 million (C$49 million) in growth financing in September 2019.