POSCO has announced its financial reports at Investor Relation (IR) conference call on April 24th that its first quarter consolidated sales were up to 14.7 billion dollars and its consolidated operating profit was 1.4 billion dollars. The consolidated net profit was approximately 1 billion dollars.

POSCO’s consolidated profits indicates positive sign for both domestic and overseas

Reach to 14.7 billion dollars consolidated sales, 1.4 billion dollars in consolidated operating profit

Sales, operating profit and net profit has elevated by 5.2%, 9% and 10.9% compared to the previous year. This impressive achievement is done by the improvement of both domestic and overseas steel production and non-steel affiliates.

Non-consolidated sales of 7.7 billion dollars and 946 million dollars of operating profit.

PT. KRAKATAU POSCO, which is an integrated steel mill in Indonesia also turn into profit from the third quarter. Despite of decrease of steel bar and shaped steel plant from POSCO SS VINA in Vietnam, operating profit has increased gradually. This great performance of oversea steel subsidiaries gives positive indication of growth in sales.

Its non-consolidated sales rate has increased by 9.8% year-on-year to 7.7 billion dollars. Also, the proportion of the sales of World Premium products went up by 1.4% year-on-year to 54.9%.

Increased sales of high-value-added products, cost reduction, continued improvement of profitability, and the increased price of steel were the driving force of increasing operating profit margin from 1.8%p year-on-year to 13.1%.

Future is even brighter

POSCO expects that demand of steel will continuously increase on the back of steady restructuring of the Chinese steel industry and recovery of emerging economies. POSCO still also continue to secure financial soundness, reducing costs, and expanding high value-added sales.
All those efforts of POSCO brought impressive result of increasing consolidated and non-consolidated sales to 58.4 billion dollars and 27.9 billion dollars.

Besides utility managed solar farms, solar developers are targeting other open spaces, such as auto parking lots, for large-scale energy savings (Source: Phys.org)

The surge in these installations is prompting a parallel upswing in solar infrastructure, which is seeing its own technology advances as a result of high demand and the need for greater cost efficiencies. While sturdy racking is important to protect against the ravages of nature, one of the main requirements for large solar farms — and any larger installation — is solar tracking equipment.

Solar tracking offers grid operators the opportunity to squeeze efficiency from sunlight at all hours of the day. While fixed-panel arrays are highly efficient for general-purpose energy harvesting, single-axis solar tracking can increase a solar farm’s annual output by roughly 30 percent. Dual axis trackers can add 10-20 percent beyond that. For example, air mass tables for solar panels show that a panel mounted on a tracker can harness as much as 60% of solar intensity in the late afternoon at an angle of 15 degrees, 50% at 10 degrees, and capture 25% at a mere five degrees. In large installations these gains can mean the ability to respond with enough power to satisfy peak demand.

Solar tracking systems explained

A solar tracking system is used for a variety of applications. Depending on the applications, the mounting systems will differ somewhat. Typically solar trackers hold single or multiple standard flat panels, arranged in rows and funneling power to an energy storage site or directly to a substation.

Parabolic mirrors can focus sunlight onto solar collectors. (Source: EU Solaris)

However, solar trackers are critical for large-scale solar installations using concentrated solar power (CSP). These trackers hold mounted mirrors that reflect sunlight to a central collector tower containing hot liquid or gas. They are also a key element in concentrator photovoltaic (CPV) installations that use parabolic mirrors or lenses to focus sunlight (and even ambient light from the sky) into solar collectors that are part of each unit. These panels and mirrors require precise angles to enable optimized concentration of the light onto a fixed-location tower, into Fresnel lenses, or into a solar thermal collector. The tracking system may be centralized, where a single motor moves many rows of panels at once, or a distributed system, where an individual motor moves one row or table of panels.

Horizontal single axis trackers (pictured above) are better suited for lower latitudes. (Source: Energia Solar)

Solar tracking devices can be classified by the number of axes around which they rotate and by their orientation. Horizontal single axis trackers (HSATs) are horizontal to the ground and mounted on rotating tubes supported by pylons or frames. Horizontal single axis trackers with tilted modules (HTSATs) are similar but installed at an angle, for higher latitudes, but rotate the same way. Vertical single axis tracker (VSAT) panels, also for higher latitudes, rotate around a vertical axis, but the layout must be designed to prevent the rows of panels from casting shade on each other. A hybrid horizontal/vertical tracking system is referred to as a tilted single axis tracker (TSAT).

A tilted single axis tracker is a hybrid of horizontal and vertical tracking systems. (Source: The University of Queensland)

In addition to the panels or mirrors, tracker hardware may include steel posts or rails, cables, junction boxes, slew drives to rotate the panels, and hydraulic dampers to provide flexible resistance against the wind. The structures must be robust, well-anchored, easily transported and installed, and must be able to withstand the elements, including hot or cold locations, strong storms, heavy rain or snowfall, and even seismic activity.

Perceptions of solar tracking

For a time, solar tracking for large-scale installations had a reputation as a more expensive and maintenance-intensive technology despite the higher energy capture rates. Some of these reliability perceptions still linger. In actuality, according to Greentech Media, solar tracking systems boast a 99.9 percent uptime rate and advances continue in mechanical functionality and software-based optimization. In fact, the U.S. Energy Information Administration reports that of all utility solar projects constructed in the US in 2016, 79% used solar tracking rather than a fixed panel.

Advances in solar tracking

Despite being perceived as a less exciting infrastructural component of the solar industry, solar tracking has seen a number of technological and mechanical breakthroughs that promise increased growth due to lower costs and increased weather resistance.

One of the challenges is the economics of land use and site preparation. Until recently, utilities and third-party solar farm developers had to plan carefully to ensure that the needed amount of power could be generated from a particular site size given solar tracker configurations (e.g. HSAT vs VSAT). Additionally, they had to take into consideration the site contours and how much grading and preparation would be required to adapt the site to optimized solar tracker deployment. As a result, there has been stiff competition for flat sites.

Utilizing slopes and rolling terrain

In California, a company called Nevados Engineering is on the verge of launching single axis trackers designed to work on south-facing and sun-facing slopes and varied terrain, which offer better solar exposure. The company’s All Terrain Tracker (ATT) technology uses unique bearings that allow articulation with the driveline so it can fit the terrain using the same kind of posts as on flat land. Every post in the row is used to withstand the slope load, which is the toppling force exerted by the structure being pulled down the hill by gravity. The tracking units can handle slopes of over 20 degrees and can also handle side-to-side, and vertical, post misalignment of up to two feet. The advance vastly reduces the need for grading and landscaping, enabling solar developers to purchase significantly cheaper sloped or contoured terrain to maximize solar energy capture.  The company’s software enables developers to predict solar production for a site to calculate the economics.

Nevados Engineering’s All Terrain Tracker technology and help install solar trackers in all kinds of terrains. (Source: LA Cleantech Incubator)

“We need to look beyond what we expect solar trackers to do,” said Yezin Taha, CEO of Nevados Engineering. “Installing trackers on a slope can capture 7% more solar energy than trackers on flat ground, and 32% more energy than fixed tilt systems.”

Leveraging non-standard sites

Another recent development, floating ground mounts, has also made more large-scale solar sites available. While most solar trackers are mounted on posts that are driven directly into the ground or less frequently, on posts that use concrete foundations or ballast, certain kinds of terrain won’t support driving posts or invasive concrete structures. These sites, such as capped landfills, can be highly suitable for solar installations due to their height, restricted access, and unsuitability for other uses. The development of floating ground mounts, where the tracker is placed on a gravel pan that can be filled with a variety of materials, has made possible the use of these kinds of sites where posts can’t be driven.

Resisting the elements

Advances in resistive materials also show promise for the solar tracking industry. Posts and other tracking components are typically made of galvanized steel, which means they are coated with a high zinc content layer. Galvanization has been the most weatherproof and anti-corrosive solution to-date, but it still allows rust to form over time. Moisture can be an electrolyte that enables galvanic corrosion to occur, so that as humidity increases, the rate of corrosion increases. Also, atmospheric contaminants can catalyze the chemical reaction. Chlorides in marine environments, as well as and sulfur dioxide and nitrous oxides in industrial locations, may present a higher risk of corrosion.

Recently steel companies such as POSCO have begun to add magnesium to the coatings for further protection, a process that had been prohibitively complex until now.  POSCO’s PosMAC is a combination of zinc, aluminum and magnesium that “heals” any exposed parts of the steel by forming a layer of simonkolleite, a stable compound, over the vulnerable area. The development promises greater ruggedness and durability for tracking components.

Streamlining operations and maintenance

Finally, the advent of sensors, drone-based inspections, and the Internet of Things (IoT) will have a growing impact on solar farm operational costs by enabling remote monitoring, hardware predictability, just-in-time replacement and streamlined functioning. An operator in Germany could easily determine when to clean the solar panels in a Dubai installation after a dust storm or know when a tracking mechanism becomes jammed.

Solar tracking mechanisms can be monitored easily with the help of artificial intelligence. (Source: Micro Power Grids)

These advances, coupled with the cost efficiencies of solar and the increasing availability of grid-level energy storage solutions, will continue to boost the utility-scale solar energy market and take market share from fossil fuel power plants. The expansion of solar power offers a significant opportunity for multiple industries, from materials providers to solar panel manufacturers, tracking system component manufacturers, sensor distributors, battery makers, software developers and even drone suppliers. By leveraging the confluence of these technologies each industry can ensure that they participate in the solar market’s return on investment.

Tom Breunig is the publisher of Cleantech Concepts, an online magazine and market research firm tracking cleantech R&D and innovative business models.

Upon completion, the Green Iris will transport limestones from the port of Donghae in Gangwon-do to Gwangyang Works from the beginning of 2018.

POSCO’s high manganese steel allows the fuel tank to withstand temperatures as low as -196℃, so that it can store and transfer LNG. Moreover, it is highly weldable and cost-efficient compared to other common materials for LNG fuel tanks such as nickel steel or aluminum alloys.

POSCO developed the technology for its high manganese steel after 10 years of research since the late 2000s. Now, it is one of POSCO’s leading World Premium Products (WPP). Due to strengthening environmental regulations worldwide on emissions of sulfur oxides, nitrogen oxides and carbon dioxide from vessels, demand for high manganese steel for LNG tanks are expected to increase dramatically.

Cover photo courtesy of Gas Asia Summit.