
Energy storage is the capture of produced at one time for use at a later time to reduce imbalances between energy demand and energy production. A device that stores energy is generally called an or . Energy comes in multiple forms including radiation, , , , electricity, elevated temperature, and . En. The key is to store energy produced when renewable generation capacity is high, so we can use it later when we need it. With the world’s renewable energy capacity reaching record levels, four storage technologies are fundamental to smoothing out peaks and dips in energy demand without resorting to fossil fuels. [pdf]

The different kinds of thermal energy storage can be divided into three separate categories: sensible heat, latent heat, and thermo-chemical heat storage. Each of these has different advantages and disadvantages that determine their applications. Sensible heat storage (SHS) is the most straightforward method. It simply means the temperature of some medium is either increased or decreased. This type of storage is the most commerciall. Other sources of thermal energy for storage include heat or cold produced with heat pumps from off-peak, lower cost electric power, a practice called peak shaving; heat from combined heat and power (CHP) power plants; heat produced by renewable electrical energy that exceeds grid demand and waste heat from industrial processes. [pdf]
Heat storage, both seasonal and short term, is considered an important means for cheaply balancing high shares of variable renewable electricity production and integration of electricity and heating sectors in energy systems almost or completely fed by renewable energy.
Thermal energy can generally be stored in two ways: sensible heat storage and latent heat storage. It is also possible to store thermal energy in a combination of sensible and latent, which is called hybrid thermal energy storage. Figure 2.8 shows the branch of thermal energy storage methods.
As thermal energy storage is performed based on the heat changes in an energy storage medium, first, we need to define the branch of heat. There are two types of heat change in a material: sensible and latent heat. When energy is released from a material, the temperature of that material decreases.
It is possible to store any type of energy in heat storage systems. For instance, solar energy can be stored in the form of sensible heat in solar domestic hot water systems or solar ponds. In the cold thermal energy storage systems, electricity load can be stored. Also, heat storage can be used in the organic Rankine cycle to store electricity.
Chemical heat storage systems use reversible reactions which involve absorption and release of heat for the purpose of thermal energy storage. They have a middle range operating temperature between 200 °C and 400 °C. Below equation represents a generic chemical equation for TES function .
There are several applications for heat storage systems in residential and industrial settings. It is possible to store any type of energy in heat storage systems. For instance, solar energy can be stored in the form of sensible heat in solar domestic hot water systems or solar ponds.

Energy in Uruguay describes and production, consumption and import in . As part of climate mitigation measures and an energy transformation, Uruguay has converted over 98% of its electrical grid to sustainable energy sources (primarily solar, wind, and hydro). are primarily imported into Uruguay for transportation, industrial uses and applicat. . The electricity sector of Uruguay has traditionally been based on domestic along with plants, and reliant on imports from and at times of peak demand. Over the last 10 years, investments in renewable energy sources such as and allowed the country to cover in early 2016 94.5% of its electricity needs with [pdf]
Uruguay generates nearly half of its electricity from wind and solar, more than any other country in Latin America and the Caribbean. Source: Visual Capitalist: Solar & Wind Power by Country © 2020 The World Bank, Source: Global Solar Atlas 2.0, Solar resource data: Solargis.
Uruguay primarily imports natural gas from Argentina via the Gasoducto Cruz del Sur. As of May 2021, there are no new projects proposed for oil and gas in Uruguay. Uruguay generates nearly half of its electricity from wind and solar, more than any other country in Latin America and the Caribbean.
In 2020, Uruguay produced 13.5 TWh of electricity, with 40% coming from wind energy, 30% from hydro, 20% from biomass, 6% from fossil fuels, and 4% from solar. As of 2020, 100% of the population has access to electricity. The UTE is spending $960 million between 2020-2025 for installing new electrical transmission infrastructure.
As of 2020, renewables accounted for 75.8% of Uruguay's electrical capacity, while non-renewable sources made up the remaining 24.2% (down from 29% in 2016).
The current 6% private contribution to the generation park is expected to increase as investments in new wind power plants materialize. Renewables could play a role in future energy supply, in particular wind power, allowing Uruguay to reduce its dependence on imports.
According to the National Directorate for Energy and Nuclear Technology (DNETN), grid-connected wind power generation is one of the domestic resources with both medium and long term potential in Uruguay. The government has taken action to promote RE development.
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