Sustainable energy

Pros and Cons of Solar Energy

May 2, 2016

Advantages of Solar Energy

Solar energy is a renewable energy source, meaning we cannot run out of solar energy; as opposed to non-renewable energy sources (e.g. fossil fuels, coal and nuclear).   We will have access to solar energy for as long as the sun is alive—another 6.5 billion years according to NASA.

The potential of solar energy is beyond imagination.  The surface of the earth receives 120,000 terawatts of solar radiation (sunlight)—20,000 times more power than what is needed to supply the entire world.

This abundant and renewable energy source is also sustainable.  Sustainable energy sources meet the needs of the present without compromising the ability of future generations to meet their needs.  In other words, solar energy is sustainable because there is no way we can over-consume.

Harnessing solar energy generally does not cause pollution.  However, there are emissions associated with the manufacturing, transportation, and installation of solar power systems—almost nothing compared to most conventional energy sources.  It is clear that solar energy reduces our dependence on non-renewable energy sources.  This is an important step in fighting the climate crisis.

Solar energy is available all over the world.  Countries that are closest to the Equator are not the only ones which can put solar energy to use—Germany, for example, has by far the highest capacity of solar power in the world.  With the introduction of net metering and feed-in tariff (FIT) schemes, homeowners can now sell excess electricity, or receive bill credits, during times when they produce more electricity than what they actually consume.

Homeowners can reduce their overall electricity expenses by going solar.  Data from One Block Off the Grid reveal that adding solar panels to your home can bring in monthly savings of well above $100 in many states.

Solar energy can be used for many different purposes.  It can be used to generate electricity in places that lack a grid connection, for distilling water in Africa, or even to power satellites in space.

Solar energy is silent.  There are no moving parts involved in most applications of solar power. There is no noise associated with photovoltaics.  This compares favorably to certain other green-techs such as wind turbines.

The majority of today`s solar power systems do not required a lot of maintenance. Residential solar panels usually only require cleaning a couple of times a year. Serious solar manufacturers ship 20- or 25-year warranties with their solar panels.


Technological advancements are constantly being made in the solar power industry. Innovation in nanotechnology and quantum physics has the potential to triple the electrical output of solar panels.

Disadvantages of Solar Energy

Is solar power really expensive? This is probably the most debatable aspect on the entire solar energy pros and cons list.  The driving forces behind the development of solar energy are rooted in politics.  Solar power is incentivized to compete against other energy sources on the market.  On the other hand, the U.S. government, similarly to the rest of the world, provides incentives to every major energy production market – not just solar.  In 2010, coal received $1,189 billion in federal subsidies and support for electricity production; while solar is not far behind at $968 billion.  Nowadays, the best solar panels can in many situations be cheaper than buying electricity from the utility. This wouldn`t have been possible without incentives.

Solar energy is an intermittent energy source.  Access to sunlight is limited at certain times (e.g. morning and night). Predicting overcast days can be difficult.  This is why solar power is not our first choice when it comes to meeting the base load energy demand.  However, solar power has fewer problems than wind power when it comes to intermittence.

Energy storage systems such as batteries will help smoothen out demand and load, making solar power more stable, but these technologies are also expensive.

While solar power certainly is less polluting than fossil fuels, some problems do exist.  Some manufacturing processes are associated with greenhouse gas emissions.  Nitrogen trifluroide and sulfur hexafluoride has been traced back to the production of solar panels.  These are some of the most potent greenhouse gases and have many thousand times the impact on global warming compared to carbon dioxide.  Transportation and installation of solar power systems can also indirectly cause pollution.

Solar power requires space for the solar panels.  Power density, or watt per square meter (W/m²), is essential when looking at how much power can be derived from a certain area of real estate of an energy source.  Low power density indicates that too much real estate is required to provide the power we demand at reasonable prices.  The global mean power density for solar radiation is 170 W/m².  This is more than any other renewable energy source, but not comparable to oil, gas, and nuclear power.

The bottom line is this: There’s nothing that’s completely risk-free in the energy world, but solar power compares very favorably with all other technologies.

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