Small Hydropower Market:
Hydropower is the largest renewable source of power generation and currently accounts for about 20% of the world’s total electricity supply. Hydropower became a source of electricity generation in the late 19th century. Hydropower plants can be classified into large, small, micro and mini depending on its generation capacity. The hydropower systems between 1 MW to 30 MW are generally considered small, though the definition varies from country to country. Small hydropower plants produce electricity on a small scale to serve small communities or industrial establishments. These plants can also be grid connected in addition to the areas where it is used off grid as an economic source of electricity generation or where there is no grid connectivity. Small and mini hydro generally uses existing dams or the dams constructed for other purposes such as water level control and irrigation. At times, old abandoned hydropower sites are also redeveloped for small hydropower generation.
Small hydropower plants provide certain benefits over the large
hydropower plants in terms of financial viability. Small hydropower
generation plants have a shorter gestation period; large hydropower
plants usually have a gestation period of about seven years, whereas
it is about two to five years for small plants. Additionally, small
hydro plants give a higher return on investment due to the low
capital investment and operational and maintenance costs. Small
hydropower plants are easier to construct and commission due to
simpler designs, thereby keeping the costs down.
As small hydropower installations have minimal infrastructure
requirements, they possess a large potential for cost effectiveness.
Small hydropower technology is not receiving similar benefits or
incentives and subsidies as other sources of renewable energy even
though it is a proven and low risk technology. The cost of machinery
(equipment) in small hydropower plants depends on several factors
such as head height, complexity of the civil work involved, electric
works and other external costs. The other external cost largely
involves the cost of obtaining a license and other engineering
services.
Global small hydropower cumulative installed capacity increased from
54 GW in 2001 to 87 GW in 2009, registering a CAGR of 6% during this
period. Annual installed capacity surged during 2004 mainly due to a
rise in new installations in China. The advantages of generating
electricity from small hydropower coupled with a rising interest in
the sector has led to increased government support policies which
will derive installations in many countries in the years to come.
Cumulative installed capacity of small hydropower is expected to
reach 140 GW in 2015 and 201 GW in 2020.
The Asia Pacific region is the leader in terms of installed
capacity followed by Europe. The growth in the Asia Pacific region
is largely attributable to the strong growth in China’s small hydro
market while in Europe Italy leads the installed capacity. The top
five countries the small hydropower market, in terms of installed
capacity, are China, Japan, the US, Brazil and Italy (2009). The top
five countries represent around 84% of the global cumulative
installed capacity.
China small hydro power market
China has good small hydropower potential, with estimated capacity
of 128GW of which nearly 40% is exploited. Under the National Medium
and Long-Term Development Plan for Renewable Energy (introduced in
2007 and amended in 2009), the country is planning to have 75 GW of
small hydro cumulative installed capacity by 2020. The small
hydropower market in the country is driven by the Chinese
government’s rural electrification programs.. At present, more than
30% of China’s counties depend on small hydro to meet their
electricity requirements.
The major under construction small hydro plants in China include
Beiping, Cizhong, Ma'er, Chayuan and Liujiagou. The Bejping plant
has rated capacity of 25 MW, situated on the Panhe River and owned
by Chongqing Water Resources Investment Group Co., Ltd. The Cizhong
plant and Ma’er plants have a rated capacity of 24 MW, owned by
Deqin County Cizhong river Hydropower Co., Ltd and Nujiang Zhedian
Hydropower Development.
Chayuan and Liujiagou have a rating capacity of 20 MW each, and are
owned by NEFCO Nordic Environment Finance Corporation and Wuxi
Yuanda Hydro Power Co. Ltd.
The US small hydro power market
In the US, small hydropower gained traction especially after the
enactment of the Energy Policy Act in 2005. The American Recovery
and Reinvestment Act (ARRA) of 2009 strengthened the regulatory
support to the sector. The ARRA provided a 30% investment tax credit
and grants for adding capacity to the existing plants and non
powered dams. This resulted in a rise in the number of requests to
build small hydro plants, especially facilities with capacity of up
to 5 MW. The country has tremendous potential to add capacity to
existing non-powered dams as 97% of about 79,000 dams in the US are
not generating any power. Furthermore, since most of the
environmental damage associated with the construction and operation
of dams has already taken place, energizing these dams will not have
a high impact on the environment. Of the 2,500 operating dams, about
85% of them are categorized as small scale as they have the rated
capacity of less than 30 MW. Another 76,500 dams are currently not
operating. These dams, if energized, have the potential to supply an
additional 7.3 GW of capacity by 2025.
In the US, major small hydro plants under construction include Lake
Livingston, Turnbull Hydro, St. Anthony Falls, Youngs Creek and
Youngs Creek Hydro. The Lake Livingston plant has a rated capacity
of 24 MW and is situated on Trinity River. The Turnbull hydropower
plant that has a rated capacity of 13 MW is situated on Spring
Valley Canal and is owned by Turnbull Hydro, LLC. St. Anthony Falls
has a rated capacity of 10 MW which is to be built over Mississippi
river, owned by Brookfield Renewable Power Inc and Nelson Energy
Inc. Youngs Creek and Youngs Creek Hydro are situated over Elwell
Creek, Skykomish with a capacity of 7.5 MW each, owned by Snohomish
County PUD. A 29 MW small hydro plant is planned over Tygart River
which is owned by US Army Corps of Engineers.
Brazil small hydro power market
Rising energy demand and concerns for energy security have been
driving the small hydropower market in Brazil since 2000 and are
expected to drive it further in years to come. Hydropower is
expected to play a major role in the Brazilian energy mix, though
its share might go down slightly due to the development of other
sources of renewable energy. Hydropower is forecast to account for
73% of the total energy capacity in Brazil by 2015. The country
possesses huge potential for hydropower development, especially in
the Amazon region. Hydropower potential in Brazil stands at 260 GW,
of which only one third is currently exploited. The northern region
of the country alone accounts for more than 40% of the country’s
economically viable hydropower potential. By 2020, small hydro is
expected to generate around 62,214 GWh from 15,293 GWh in 2009.
In Brazil, major small hydro plants are included in the category of
planned and under construction: Serra dos Cavalinhos II, Goiandira,
Volkswagen 25.2 MW / Sapucai River SHP, PCH Paracambi, and Pirapora.
The Serra dos Cavalinhos II plant has a rated capacity of 29 MW to
be built on Taquari river, owned by Brookfield Renewable Power. The
Goiandira plant is to be built on Verissimo river with a rating
capacity of 27 MW. Volkswagen do Brasil Ltd is planning to build a
small hydropower plant with a capacity of 25.2 MW over Sapucai
River. Empresa Metropolitana de Aguas e Energia SA is planning to
come up with a small hydropower plant with a capacity of 25 MW over
Tiete River.
Among the other major countries, Japan, has registered a declining
trend in annual installations largely due to decommissioning of old
plants. Government support in terms of financial incentives and
grants will drive growth in small hydropower installations in Japan,
which will rise to 9,533 MW by 2015 and 9,668 by 2020. In Europe,
Italy is one of the largest markets for small hydro power accounting
for nearly 21% of the overall Europe market. Hydropower is one of
the most important sources of electricity generation in Italy,
supplying about 25% if the total electricity produced in the
country. The major hydropower producer in the country is a state
owned utility Enel SpA. The country still has non-utilized potential
for hydropower, amounting to about 15 TWh of electricity per year.
In Italy, the small hydro power generation is expected to reach
11,106 GWh by 2020.
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