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What is renewable energy?

As a category, renewable energy encompasses a broad range of energy technologies and fuels, ranging from photovoltaic solar cells to the burning of animal dung for fuel in many poor regions of the world. Major sources of renewable energy –– in the rough order of the amount of energy they contribute globally –– include hydroelectric power, wood used for heating, cooking, and electrical generation, bioenergy produced from agricultural crops and waste, wind energy, concentrated solar power generated with mirrors and steam turbines, photovoltaic solar cells, geothermal energy, and tidal energy.

Sources of “renewable” energy are finite but inexhaustible, meaning that there is a physical limit to how much energy might be produced from any given renewable energy technology, but the maximum utilization of that technology in the present does not diminish our ability to utilize it in the future. There is, for instance, a theoretical limit to the amount of solar radiation that might be harnessed for energy production today, but fully utilizing all of the solar radiation hitting the earth today does not diminish our ability to fully utilize that radiation tomorrow. Similarly, burning wood for fuel this year does not diminish the long term capacity to burn wood for fuel so long as the amount of wood harvested for fuel annually does not exceed the rate at which forests grow.

Is it possible to power the entire world with renewables?

That depends on what you mean. Until a few hundred years ago, we powered the entire world almost entirely with renewable forms of energy, mostly by burning wood for fuel, using animal fats like whale oil for lighting, and using animal labor for motive power.1 But 100 years ago, the world had vastly fewer people, virtually all of whom were significantly poorer than the average person today.

So the question is whether we can power today’s world, or, more accurately, the world in 2040 or 2050, with renewable energy. The world in 2050, with a population exceeding 9 billion people and a greater proportion having achieved modern living standards, will almost certainly require at least twice as much energy as the world today, and more than 50 times more energy than was required to power the pre-industrial world when we last depended primarily on renewable energy sources.

Some analyses suggest that it is theoretically possible to power today’s world with renewable energy, but these analyses uniformly assume drastic reductions in global energy consumption.4 Such projections also assume significant breakthroughs in the scalability and reliability of renewable energy technologies while typically failing to account for the costs or the amount of land needed to scale up to levels consistent with meeting expected future energy demand.

Why has it proven so difficult to scale wind and solar energy?

Harnessing energy flows, such as the blowing wind and the shining sun, rather than utilizing energy stocks, such as fossil fuels or uranium, has the advantage of being an inexhaustible resource but the disadvantage of being extremely diffuse. Wind turbines must be deployed across vast landscapes to capture enough energy to meet the demands of a modern economy. Solar radiation is, theoretically, less diffuse. But current solar panel technologies don’t convert that energy to electricity very efficiently. The places in which solar radiation and wind are most abundant are also often far removed from the places where electricity is needed, requiring costly long distance transmission.

Wind and solar energy are also highly intermittent. As a result, solar and wind generation capacity must be heavily overbuilt, meaning that the actual energy produced by solar panels and wind turbines is substantially less than what is theoretically possible. Typically, a 100 MW wind farm will not have a capacity factor above 30 percent, meaning that on average, a wind farm with a total capacity of 100 MW will only produce about 30 MW of electricity. Capacity factors for solar panels are typically lower, in the range of 10 to 25 percent. In northerly climates like Germany, the average capacity factor for solar panels is around 10 percent. Hence, while Germany’s installed solar generation on rare occasions produces upwards of 50 percent of its total electricity, annually it only produces about 5 percent.

Taken together, these challenges present substantial obstacles to scaling solar and wind energy. The need to overbuild generation capacity substantially increases costs, as does the need to transmit electricity across very long distances. Lacking very large-scale and affordable energy storage technologies, wind and solar require the availability of substantial backup generation capacity, usually coal- or gas-fired generation that can be ramped up and down quickly in response to highly variable electricity production, further adding to the cost of integrating wind and solar into electrical grids as grid penetration rises.

What are the land impacts of renewables?

Present-day wind and solar technologies are very low-density, and generating large amounts of electricity from them comes with substantial land use implications. The recently completed Ivanpah concentrated solar facility, for instance, produces about the same amount of electricity as two small modular nuclear reactors but requires 92 times as much land as the nuclear plant. The recently approved Hinkley nuclear plant in Great Britain will produce the same amount of electricity as a 250,000-acre wind farm on a 430-acre site.

When taking life-cycle land impacts into account, nuclear power remains the most land efficient form of energy production, while various forms of bioenergy are the least efficient. According to a review of estimates, solar power requires 6 to 15 times as much land per unit energy as nuclear power, wind 30 times as much land, and biomass 225 times. Some technologies like rooftop solar have functionally zero land use impacts, but ultimately there are only so many rooftops on which to put solar panels. Scaling solar will ultimately require building large-scale solar farms.

As such, scaling wind and solar will bring significant environmental impacts for ecosystems, biodiversity, watersheds, and viewsheds. Even at relatively low levels of deployment, those impacts have generated significant local opposition to wind and solar development, often from environmental groups themselves, creating significant obstacles to large-scale expansion of wind and solar.

What are realistic expectations for wind and solar, given current technology?

Despite the challenges enumerated above, it is likely that wind and solar energy will play a significant role in our energy future. The cost of energy produced from solar panels and wind turbines has declined significantly. Continuing declines in the cost of photovoltaic solar panels may open up much larger markets for rooftop solar while similar improvements in the cost and performance of wind turbines may make large-scale on- and offshore wind farms economically viable in the coming decades. Taken together, these continuing developments may allow wind and solar energy to grow from present levels, which are negligible globally, to something on the order of 15 or 20 percent of global electricity generation over the next three or four decades. Few detailed energy technology assessments, however, expect wind and solar to account for a significantly larger share of global electricity, much less primary energy, without fundamental breakthroughs across a range of technologies, including much more efficient solar cells and utility scale energy storage technologies.

BP expects non-hydro renewables (including solar, wind, biomass, geothermal, and other) to supply about 14 percent of global electricity in 2035. Beyond electricity, BP projects non-hydro renewables and bioenergy will supply about 7 percent of total primary energy, up from about 2 percent today.

Can biofuels scale up significantly?

Biofuels once fueled virtually all transportation and other forms of labor such as pasture lands that fed horses, oxen, and other domesticated animals that humans utilized for transport and agriculture. Today, we have more technologically advanced ways to convert biomass into transportation fuels. But despite decades of efforts to improve these technologies, we haven’t made much progress in improving the land efficiency of biofuel production and conversion. Current generation technologies to create biofuel from corn and sugar cane require vast expanses of agricultural land and often compete with crops for food production. As a result, food prices increase as well as pressure to convert forests to agricultural land, particularly in the tropics.

Next-generation technologies to create cellulosic fuels from agricultural waste, or from more land efficient crops such as switchgrass, are somewhat less land intensive, but would still require vast resources – water, land, and fertilizers – to produce fuels that would displace petroleum at significant scale. Very advanced technologies to produce fuels from algae or other microorganisms might allow for much more land efficient fuel production, but those technologies are still highly speculative.

How much more do renewables cost in comparison to other sources?

It depends on what you count. For some consumers in some places, the cost of electricity from rooftop solar photovoltaic panels is comparable to the retail cost of grid electricity. But that doesn’t reflect the full costs. In the United States, the federal investment tax credit subsidizes about one-third of the cost of buying and installing solar panels.23 Other subsidies at the state level frequently augment that subsidy. Net metering policies in many states provide even more subsidies, requiring utilities to buy back power from solar producers at several times the effective rate at which they could purchase power on the wholesale market..

The US Energy Information Agency attempts to make “apples-to-apples” comparisons of the cost of different electricity generation technologies by estimating the “levelized cost of energy” (LCOE). LCOE is an estimate of the unit costs of electricity generated by different technologies, typically expressed in dollars per megawatt-hour ($/MWh) after public subsidies are accounted for.

LCOE, however, does not capture the full costs of different energy technologies. All energy technologies impose indirect costs of one form or another in addition to the direct costs calculated through LCOE. Due to its capital-intensive nature, for instance, nuclear power faces substantial upfront financing costs. The burning of fossil fuels impose substantial externalized costs on society, in the form of public health costs and climate change, along with the often substantial costs of procuring and transporting fuels. Renewable energy technologies create unique “system costs” in addition to the direct costs of generating power.

Solar and wind require backup sources of energy to meet load demands when the renewable resources are unavailable. Solar and wind capacity must be overbuilt and backup from more reliable energy sources, such as gas, hydro, nuclear, and coal, must be on call to deal with fluctuations and shortfalls in generation.28 Integration costs,

broadly defined, include the costs of backup generation, storage, and overbuilt renewables capacity; balancing, voltage control, and curtailment costs of intermittent power; and the cost of transmitting power over long distances from the point of generation to load centers.

The costs associated with overbuilding, firming, and backing up intermittent renewables are modest at low penetrations. But at higher penetrations they become substantial. Germany is today scaling back its renewable subsidies and mandates in part because costs associated with backing up its growing renewable energy capacity have grown substantially.

While intermittent renewables carry costs that LCOE calculations fail to account for, they also bring unique benefits that can also be undervalued. A benefit of solar power, for instance, is that in sunny, warm areas, solar panels can produce at their highest capacity when daily electricity demand peaks. This can make the value of solar power high enough to justify its higher relative costs. However, these benefits decline as renewables penetration increases. Above 10 to 20 percent of electricity generation, the value of solar power to a grid declines substantially. Wind power sees less decline in its value to the grid as penetrations rise, but that is because its value to the grid compared to solar power is lower to start with, as wind generation fluctuations are less usefully or predictably correlated with demand load

In some locales, most notably Northern Europe, peak load occurs in colder months, when sunlight is exceptionally scarce, further lowering the capacity value of technologies like solar power.

These issues might be resolved through the development of utility-scale energy storage technologies. However, those technologies do not yet, for the most part, exist and will also entail not insignificant additional costs to electrical systems.

Isn’t the cost of solar coming down rapidly?

As deployment of solar panels has risen over several decades, the cost of manufacturing solar panel modules has declined consistently. Between 2007 and 2012, solar panel costs declined precipitously. Recent rates of rapid cost declines are not expected to continue by most industry analysts, however. The recent price declines have been driven by over-production as much as real reductions in actual production costs. Heavy solar subsidies in developed countries, like the United States and Germany, combined with heavy production subsidies in China and other developing countries created a global glut of solar manufacturing capacity and solar module inventories. Chinese firms, in particular, have been accused of dumping excess production capacity at below the cost of production in key export markets such as the United States and Europe. Trade actions taken by the United States Trade Commission and the European Community have alleged that Chinese dumping has depressed the price of solar modules by as much as 75 percent.

Actions to scale back solar subsidies in many parts of the world have triggered a consolidation within the industry, with module inventories declining and manufacturing facilities closing. As this has occurred, module prices have begun to rise. Over the longer term, module costs will likely revert to long-term cost trends, with prices coming down more slowly. Declining module costs, however, will have a less pronounced effect on solar system costs going forward then they have in the past. This is because module costs no longer represent the lion’s share of total solar costs.

While module costs have fallen, other costs associated with solar panels have not. Because solar technology in general, and rooftop solar most of all, tends to be more distributed than conventional power plants like natural gas or nuclear plants, solar systems typically have a much higher ratio of installation, permitting, interconnection, and other non-hardware costs in relation to the cost of producing the actual hardware and fuel. While “soft costs” of this nature can also see returns to scale, they don’t spill over from one economy to another in the same way that hardware costs do. Solar modules are a globally traded commodity, where cost reductions in, for instance, Chinese manufacturing, benefit solar costs everywhere. The same is not the case with regard to skilled labor and services. Labor-intensive economic services tend to get more, not less, expensive over the long term.

But isn’t the fact that renewables are more distributed an advantage over conventional energy technologies?

At lower levels of generation, distributed generation sited close to demand load can provide substantial benefits in the form of avoided costs of transmission and capacity. However, as illustrated above, these marginal benefits decline as penetration increases.

Most renewable energy isn’t actually distributed or decentralized. Hydroelectric power, which constitutes the vast majority of renewable energy generation, is highly centralized. Energy from biomass, which also constitute large shares of renewable generation, is generated at centralized power stations. Much of the bioenergy produced in Europe, for instance, is generated at coal power stations that have been converted to burn wood pellets. Even most solar and wind energy today is generated by large, centralized wind and solar farms, not decentralized sources.

Any future in which renewables constitute a much larger share of our energy mix is likely to see more centralization not less. All the major scenarios modeling large penetrations of renewable electricity foresee the vast majority of renewable energy, including wind and solar, coming from large power plants, requiring massive, new long-distance transmission infrastructure and not home and commercial installations.

Would renewables be more economically competitive without subsidies for fossil fuels?

While fossil fuels worldwide enjoy more absolute subsidization than renewable energy, fossil fuels also supply vastly greater quantities of energy than do renewables. Calculated as subsidy per unit of energy generated, fossil fuels receive vastly lower subsidies than renewables like wind and solar. Moreover, these subsidies represent a very small portion of their per-unit cost of energy.34 While there may be good reason to remove subsidies for fossil energy as a matter of policy, particularly in developed economies where universal access to modern energy has long been a reality, there is little evidence to suggest that removing fossil energy subsidies would substantially reduce fossil fuel dependence or increase renewable energy deployment.

A large share of global subsidies for fossil fuels are actually in the developing world, where governments often subsidize access to electricity and modern heating, cooking, and transportation fuels for poor communities. In these cases, removing subsidies would be unlikely to result in poor communities in developing economies turning to renewable energy sources, which remain substantially more expensive. Removing these subsidies, however, would, in the near term, almost certainly reduce access to modern energy services in many developing economies

Can emerging economies “leapfrog” from wood and dung to distributed renewables?

Off-grid solar and wind energy can help the rural poor meet some of their energy needs. They are cleaner than wood and dung and, in some contexts, cheaper than diesel generators. Off-grid renewables technologies, in these circumstances, can offer an important first step up the “energy ladder.” But as with conventional energy technologies, there is little market for these technologies among the global poor without substantial public aid. Given enormous global need and limited public resources, efforts to extend modern energy services to poor communities throughout the world must account for how access to those services might most cost-effectively be extended. One recent study, by the Center for Global Development, found that tens of millions more sub-Saharan Africans can achieve electricity access using centralized, gas-fired generation than current off-grid renewable technologies.

Strategies to extend energy access through off-grid renewable energy systems must also account for a broader development context. If off-grid and micro-grid solutions to provide access to modern energy services are to be successful, they must 1) facilitate “productive uses” of energy, or energy consumption that spur economic development; and 2) function in a way where connection to the central grid is achievable at some point in the future.39 Installing off-grid generation technologies without considering these conditions risks partitioning the process of expanding energy access from the broader processes of urbanization, industrialization, democratization, and economic growth..

How much of the world’s energy comes from renewable sources today?

Sustainable CUNY released a Resilient Solar Roadmap for NYC through its NYSolar Smart DG Hub in an effort to increase the deployment of resilient, Some advanced developed economies have met significant percentages of their electricity demand with solar and wind energy at certain times. Solar power, for instance, supplied over 50 percent of Germany’s electricity demand for a few hours during a sunny weekend in 2012.8 But overall, solar provided only about 5 percent of Germany’s total electricity generation that year. All together, Germany gets a quarter of its electricity from renewables. But about half of that still comes from hydropower and biomass.

Some countries have reached considerable penetrations of wind energy. Denmark, for instance, gets 34 percent of its electricity from wind turbines.9 But that is made possible because Denmark’s grid is interconnected with Sweden’s. When the wind isn’t blowing, Denmark is able to import large volumes of Swedish hydro and nuclear power, and when Denmark has more wind than it needs, it can export it to Sweden. As a percentage of generation on the total interconnected grid, Denmark’s wind represents a significantly lower percentage of total electrical generation.

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Our aim is to generate energy for the future. Solar power remains the most secure source of energy for the future. We set global standards in achieving this goal.

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