Batteries have an important role as energy sources with environmental advantages. They offset the negative environmental impacts of fossil fuels or nuclear-based power; they are also recyclable. These attributes have led to increasing research with the aim of improving battery design and environmental impact, particularly regarding their end of life. In addition, there is a desire to improve battery safety as well as design batteries from more sustainable and less toxic materials.
New research shows that aluminium battery could offer several advantages:
Aluminium metal anode batteries could hold promise as an environmentally friendly and sustainable replacement for the current lithium battery technology. Among aluminium’s benefits are its abundance, it is the third most plentiful element the Earth’s crust.
To date aluminium anode batteries have not moved into commercial use, mainly because using graphite as a cathode leads to a battery with an energy content which is too low to be useful.
This is promising for future research and development of aluminium as well as other metal-organic batteries.
New UK battery project is said to be vital for balancing the country’s electricity demand
Work has begun on what is said to be Europe’s biggest battery. The 100MW Minety power storage project, which is being built in southwest England, UK, will comprise two 50MW battery storage systems. The project is backed by China Huaneng Group and Chinese sovereign wealth fund CNIC.
Shell Energy Europe Limited (SEEL) has agreed a multi-year power offtake agreement which will enable the oil and gas major, along with its recently acquired subsidiary Limejump, to optimise the use of renewable power in the area.
In a statement David Wells, Vice President of SEEL said ‘Projects like this will be vital for balancing the UK’s electricity demand and supply as wind and solar power play bigger roles in powering our lives.
The major hurdles for battery design, states the EU’s document, include finding suitable materials for electrodes and electrolytes that will work well together, not compromise battery design, and meet the sustainability criteria now required. The process is trial and error, but progress is being made.
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But before proceeding, it is important to first distinguish between the terms ‘primary energy consumption’ and ‘final energy consumption’. The former refers to the fuel type in its original state before conversion and transformation. The latter refers to energy consumed by end users.
Oil consumption is on the decline.
In 2018, UK primary energy consumption was 193.7 m tonnes of oil equivalent. This value is down 1.3% from 2017 and down 9.4% from 2010. This year, the trend has continued so far. Compared to the same time period last year, the first three months of 2019 have shown a declination of 4.4% in primary fuel consumption.
It is also important to identify consumption trends for specific fuels. Figure 1 below illustrates the percentage increases and decreases of consumption per fuel type in 2018 compared to 2017 and 2010.
Figure 1 shows UK Primary Energy Consumption by Fuel Type in 2018 Compared to 2017 & 2010. Figure: BEIS. Contains public sector information licensed under the Open Government Licence v1.0.
As can be seen in 2018, petroleum and natural gas were the most consumed fuels. However, UK coal consumption has dropped by almost 20% since 2017 and even more significantly since 2010. But perhaps the most noticeable percentage change in fuel consumption is that of renewable fuels like bioenergy and wind, solar and hydro primary electricity.
In just eight years, consumption of these fuels increased by 124% and 442%, respectively, thus emphasising the increasingly important role renewables play in UK energy consumption and the overall energy system.
Overall, the UK’s final energy consumption in 2018, compared to 2017, was 0.7% higher at a value of approximately 145 m tonnes of oil equivalent. However, since 2010, consumption has still declined by approximately 5%. More specifically, figure 2 illustrates consumption for individual sectors and how this has changed since.
Figure 2 from UK Final Energy Consumption by Sector in 2018 Compared to 2017 & 2010. Figure: BEIS. Contains public sector information licensed under the Open Government Licence v1.0.
Immediately, it is seen that the majority of energy, consumed in the UK, stems from the transport and domestic sector. Though the domestic sector has reduced consumption by 18% since 2010, it still remains a heavy emitting sector and accounted for 18% of the UK’s total carbon dioxide emissions in 2018.
Therefore, further efforts but be taken to minimise emissions. This could be achieved by increasing household energy efficiency and therefore reducing energy consumption and/or switching to alternative fuels.
Loft insulation is an example of increasing household energy efficiency.
Overall, since 2010, final energy consumption within the transport sector has increased by approximately 3%. In 2017, the biggest percentage increase in energy consumption arose from air transport.
Interestingly, in 2017, electricity consumption in the transport sector increased by 33% due to an increased number of electric vehicles on the road. Despite this, this sector still accounted for one-third of total UK carbon emissions in 2018.
Year upon year, the level of primary electricity consumed from renewables has increased and the percentage of coal consumption has declined significantly, setting a positive trend for years to come.
2019 has been declared by UNESCO as the Year of the Periodic Table. To celebrate, we are releasing a series of blogs about our favourite elements and their importance to the chemical industry. Today we look at copper and some of its popular uses.
A brief history
Copper was one of the first metals ever extracted and used by humans. According to the US Geological Survey, copper ranks as the third most consumed industrial metal in the world, dating back to around 5000BC.
Around 5500BC, early ancestors discovered the malleable properties of copper, and discovered they could be fashioned into tools and weapons – a discovery that allowed humans to emerge out of the stone age and drift into the age of metals.
Volcanic rocks in Tenerife, Spain.
Approximately two-thirds of the Earth’s copper is found in volcanic rocks, while approximately one-quarter occurs in sedimentary rocks.
Th metal is malleable, meaning it can conduct heat and electricity, making copper an extremely useful industrial metal and is used to make electronics, cables and wiring.
What is it used for?
Since 4500BC humans have made and manufactured items from copper. Copper is used mostly as a pure metal, but its strength and hardness can be adjusted by adding tin to create a copper alloy known as bronze.
In the 1700s, pennies were made from pure copper; in the 1800s they were made from bronze; and today, pennies consist of approximately 97.5% zinc and 2.5% copper.
Copper is utilised for a variety of industrial purposes. In addition to copper’s good thermal and electric conductivity, copper now plays an important role in renewable energy systems.
As copper is an excellent conductor of heat and electricity, power systems use copper to generate and transmit energy with high efficiency and minimal environmental impacts.
E. Coli cultures on a Petri dish.
Copper plays an important role as an anti-bacterial material. Copper alloy surfaces have properties which are set out to destroy a wide range of microorganisms.
Recent studies have shown that copper alloy surfaces kill over 99.9% of E.coli microbes within two hours. In the interest of public health, especially in healthcare environments, studies led by the Environmental Protection Agency (EPA) have listed 274 different copper alloys as certified antimicrobial materials, making copper the first solid surfaced material to have been registered by the EPA.
Copper has always maintained an important role in modern society with a vast list of extensive uses. With further development of renewable energy systems and electric vehicles, we will likely see an ongoing increase in demand for copper.
Transparent solar cells that can convert invisible light wavelengths into renewable energy could supply 40% of the US’ energy demand, a Michigan State University (MSU) engineering team have reported.
In contrast to the robust, opaque solar panels that take up a large amount of space – whether on rooftops or on designated solar farms – the transparent solar cells can be placed on existing surfaces, such as windows, buildings, phones, and any other object with a clear surface.
Traditional solar panels require large amounts of space.
‘Highly transparent solar cells represent the wave of the future for new solar cell applications,’ says Richard Lunt, Associate Professor of Chemical Engineering and Materials Science at MSU.
‘We analysed their potential and show that by harvesting only invisible light, these devices can provide a similar electricity generation potential as rooftop solar while providing additional functionality to enhance the efficiency of buildings, automobiles, and mobile electronics.’
Solar, or photovoltaic, cells convert the sun’s energy into electricity. Image: Pixabay
Currently, the cells are running at 5% efficiency, says the team, compared to traditional solar panels that have recorded efficiencies between 15-18%. Lunt believes that with further research, the capability of the transparent cells could increase three-fold.
‘That is what we are working towards,’ says Lunt. ‘Traditional solar applications have been actively researched for over five decades, yet we have only been working on these highly transparent solar cells for about five years.’
The cells can be added to any existing transparent surface, including mobile phones. Image: Max Pixel
While solar panels may be more efficient at converting energy than the group’s transparent cells, Lunt says that the latter can be easily applied to more surfaces and therefore a larger surface area, increasing the overall amount of energy produced by the cells.
‘Ultimately,’ he says, ‘this technology offers a promising route to inexpensive, widespread solar adoption on small and large surfaces that were previously inaccessible.’
Transparent solar cells. Video: Michigan State University
Together, and with further work on its efficiency, the authors of the paper believe that their see-through cells and traditional solar panels could fulfil the US’ energy needs.
‘The complimentary deployment of both technologies could get us close to 100% of our demand if we also improve energy storage,’ Lunt says.
Renewables outstripped coal power for the first time in electricity generation in Europe in 2017, according to a new report. The European Power Sector in 2017 – by think-tanks Sandbag and Agora Energiewende – predicts renewables could provide half of Europe’s electricity by 2030.
Wind, solar and biomass generation collectively rose by 12% in 2017 – to 679 Terawatt hours – generating 21% of Europe’s electricity and contributing to 30% of the energy mix. ‘This is incredible progress considering just five years ago coal generation was more than twice that of wind, solar and biomass,’ the report says.
Hydroelectric power is the most popular renewable energy source worldwide. Image: PxHere
However, growth is variable. The UK and Germany alone contributed to 56% of the expansion in the past three years. There is also a ‘bias’ for wind, with a 19% increase in 2017, due to good wind conditions and huge investments, the report says.
‘This is good news now the biomass boom is over, but bad news in that solar was responsible for just 14% of the renewables growth in 2014 to 2017.’
New analysis by trade group WindEurope backs up the findings on wind power, showing that countries across Europe installed more offshore capacity than ever before: 3.14GW. This corresponds to 560 new offshore wind turbines across 17 wind farms. Fourteen projects were fully completed and connected to the grid, including the first floating offshore wind farm. Europe now has a total installed offshore wind capacity of 15.78GW.
The EU’s 2030 goals for climate and energy. Video: European Commission
Germany remains top of the European league, with the largest total installed wind-power capacity; worth 42% of the EU’s new capacity in 2017, followed by Spain, the UK, and France. Denmark boasts the largest share of wind in its power mix at 44% of electricity demand.
In July 2017, the UK government announced plans to end the sale of all new petrol and diesel cars and vans by 2040, but there’s a long way for the electric vehicle market to go before that target can be reached – low-emission vehicle sales still account for just 0.5% of total car sales.
Last week, the European Commission announced a new Innovation Deal that could go some way to overcoming barriers to electric vehicle development and acceptance by consumers.
Entitled ‘From e-mobility to recycling: the vitreous loop of the electric vehicle’, it is designed to help innovators address regulatory obstacles to the recycling and re-use of propulsion batteries in second-life applications, such as energy storage.
The deal comprises a multi-disciplinary working group of partners across industry and government in France and the Netherlands. In France, Renault, Bouygues and the Ministries for the Ecological and Inclusive Transition and Economy and Finance; in the Netherlands, renewable energy technology company LomboXnet, the Provice of Utrecht, and the Ministries of Infrastructure and Water Management, Economic Affairs, and Climate Policy.
Carlos Moedas, EU Commissioner for Research, Science and Innovation, said, ‘The electric vehicle revolution is a testimony to how innovation generates growth and fundamentally changes society for the better. In order for Europe to stay in the lead of this innovation race, we need to work together with innovators and authorities to make sure our laws do not hamper innovation. This Innovation Deal will clarify the regulatory landscape in this area, and boost demand for electric vehicles.’
Robin Berg, founder of LomboXnet is one such innovator set on fundamentally changing society for the better. In Utrecht, the Netherlands, his company has set up a smart solar charging network that allows excess solar power harvested via rooftop photovoltaic panels to be stored in electric vehicle batteries – the energy can then be transferred between car and home as demand requires.
‘Enhancing the economic value of car batteries through vehicle-to-grid applications, second-life battery projects and smart solar charging of cars, creates huge business opportunities,’ Berg said.
‘The Smart Solar Charging consortium in Utrecht Region led by LomboXnet together with Renault seeks to increase these opportunities to spur the transition to a renewable energy system and a zero-emission mobility future. Europe is leading in these developments; this Innovation Deal offers a chance to further strengthen Europe’s leadership.’
Pure electric vehicle sales were down in the first two months of 2018 compared with the previous year – although sales of plug-in hybrid cars, which combine a conventional petrol or diesel engine with an electric motor that can be charged at an outlet or on the move, were up by 40% over the same period.
Renewable energy has long been known as a greener alternative to fossil fuels, but that doesn’t mean that the former has no negative environmental impacts. Hydropower, for instance, has been known to reduce biodiversity in the land used for its systems.
Now, a team of Norwegian-based researchers have developed a methodology that quantifies the environmental effects of hydropower electricity production.
Ulla-Førre – Norway’s largest hydropower station.
Martin Dorber, PhD candidate in Industrial Ecology at the Norwegian University of Science and Technology (NTNU), is part of the team that developed the analytic tool. ‘Some hydropower reservoirs may look natural at first. However, they are human-influenced and if land has been flooded for their creation, this may impact terrestrial ecosystems,’ he said,
The Life Cycle Assessment, or LCA, can be used by industry and policymakers to identify the trade-offs associated with current and future hydropower projects. Norway is one of the top hydropower producers in the world, with 95% of its domestic electricity production coming from hydropower.
Generations inside the Hoover Dam station. Image: Richard Martin/Flickr
Many hydropower facilities include a dam – many purpose-built for hydropower generation – which stores fresh water from lakes or rivers in a reservoir.
Reducing biodiversity in the areas where hydropower development is being considered is one of the main disadvantages of the renewable source. Reduced freshwater habitats and water quality, and land flooding are among the damaging effects – all of which are difficult to assess, says the team.
‘Land use and land use change is a key issue, as it is one of the biggest drivers of biodiversity loss, because it leads to loss and degradation of habitat for many species,’ said Dorber.
Hydropower development can be damaging to freshwater habitats. Image: Pexels
Using reservoir surface area data from the Norwegian Water Resources and Water Resources Directorate and satellite images from the NASA-USGS Global Land Survey, the team were able to create a life cycle inventory that showed the amount of land needed to produce a kilowatt-hour of electricity.
‘By dividing the inundated land area with the annual electricity production of each hydropower reservoir, we calculated site-specific net land occupation values for the life cycle inventory,’ said Dorber.
‘While it’s beyond the scope of this work, our approach is a crucial step towards quantifying impacts of hydropower electricity production on biodiversity for life cycle analysis.’
While this study is exclusive to hydropower reservoirs in Norway, the team believe this analysis could be adopted by other nations looking to extend their hydropower development and assess the potential consequences.
Pumped-storage hydropower. Video: Statkraft
‘We have shown that remote sensing data can be used to quantify the land use change caused by hydropower reservoirs,’ said Dorber. ‘At the same time our results show that the land use change differs between hydropower reservoirs.’
‘More reservoir-specific land use change assessment is a key component that is needed to quantify the potential environmental impacts.’
Compared with other renewable energy resources – take solar or wind power as examples – tidal energy is still in the first stages of commercial development. But as the world moves towards a greener economy, tidal power is becoming more in demand in the competitive renewables market.
Currently, the very few tidal power plants in the world are based in Canada, China, France, Russia, South Korea, and the UK, although more are in development. Experts predict that tidal power has the potential to generate 700TWh annually, which is almost a third of the UK’s total energy consumption.
How does it work?
Tidal energy is produced by the natural movement of ocean waves during the rise and fall of tides throughout the day. Generally, generating tidal energy is easier in regions with a higher tidal range – the difference between high tide, when the water level has risen, and low tide, when levels have fallen. These levels are influenced by the moon’s gravitational pull.
The moon’s gravitational pull is responsible for the rise and fall of tides. Image: Public Domain Pictures
We are able to produce energy from this process using tidal power generators. These generators work similarly to wind turbines by drawing energy from the currents of water, and are either completely or partially submerged in water.
One advantage of tidal power generators is that water is denser than air, meaning that an individual tidal turbine can generate more power than a wind turbine, even at low currents. Tides are also predictable, with researchers arguing that it is tidal power is potentially a more reliable renewable energy source.
What is tidal power and how does it work? Video: Student Energy
There are three types of tidal energy systems: barrages, tidal streams, and tidal lagoons. Tidal barrages are structured similar to dams and generate power from river or bay tides. They are the oldest form of tidal power generation, dating back to the 1960s.
However, there is a common concern that generators and barrages can damage the environment, despite producing green energy. By creating facilities to generate energy, tidal power centres can affect the surrounding areas, leading to problems with land use and natural habitats.
Fleet tidal lagoon in Dorset, UK. Image: Geograph
Since then, technologies in tidal streams and lagoons have appeared, which work in the same fashion as barrages but have the advantage of being able to be built into the natural coastline – reducing the environmental impact often caused by the construction of barrages and generators.
However, there are no current large-scale projects with these two systems, and output is expected to be low, presenting a challenge to compete with more cost-effective renewable technologies.
Latin America is setting the pace in clean energy, led by Brazil and Mexico. Renewables account for more than half of electricity generation in Latin America and the Caribbean – compared with a world average of about 22% – according to the International Energy Agency.
Brazil is one of the world’s leading producers of hydropower, while Mexico is a leader in geothermal power. Smaller countries in the region are also taking a lead. In Costa Rica, about 99% of the country’s electricity comes from renewable sources, while in Uruguay the proportion is close to 95%.
The Itaipu hydroelectric dam, on the border of Brazil and Paraguay, generated 89.5TWh of energy in 2015. Image: Deni Williams
At the same time, countries such as Chile, Brazil, Mexico and Argentina have adjusted their regulations to encourage alternative energy without having to offer subsidies. Some have held auctions for generation contracts purely for renewables.
Latin America’s renewable energy production is dominated by an abundance of hydropower, but there is strong growth potential for other sources of renewable energy. Wind and solar power are expected to account for about 37% of the region’s electricity generation by 2040, compared with current levels of about 4%, according to a report from Bloomberg New Energy Finance (BNEF).
Total electricity generation in Latin America is forecast to grow by 66% by 2040, and renewable energy is expected to account for the vast majority of the new capacity. While Brazil has significant solar water heating, solar PV is virtually non-existent. But consumer-driven rooftop PV is expected to account for 20% of Brazil’s electricity generation by 2040, it says. This compares with an expected 24% in the leading country, Australia, followed by 15% in Germany and 12% in Japan. Meanwhile, in Mexico, solar is forecast to overtake gas and hydro to dominate Mexico’s capacity mix.
Brazil is the world’s third largest producer of renewable power, after China and the US, and has the world’s second largest hydropower capacity, after China, according to a report issued by the Renewable Energy Policy Network for the 21st Century (REN21). Brazil also ranks fourth in terms of bio-power generation - after the US, China and Germany - and fifth in terms of solar water heating collector capacity.
Rio do Fogo wind farm, Brazil. Image: The Danish Wind Industry
However, the recent economic downturn in Brazil, combined with declining electricity demand, has dampened growth in investments in renewable power in the country in the short-term. Although substantial hydropower capacity was commissioned in Brazil in 2016, the country’s renewable energy auction scheduled for 2016 was cancelled, and many projects awarded contracts in tenders through 2015 were stalled.
In the wind power sector, a shift is expected away from Brazil to other countries in the region. The unstable politic and economic climate in Brazil coincides with unprecedented auction activity in Mexico, Argentina and Chile, says Make Consulting, part of Wood Mackenzie. It expects more than 47GW of new wind power capacity to be commissioned in Latin America by 2026. But following the cancellation of Brazil’s reserve power auction planned for 2016, wind power installations in Brazil in 2019 are expected to be half the size of 2014 and 2016.