Geothermal Energy
Environment Friendly
Energy
Business plan
Energeotek extracts clean and renewable geothermal energy in order to produce
electricity and heat, used for district heating and cooling by constructing geothermal
power plants.
Geothermal energy
Geothermal energy is the energy present in the soil. The center of the earth is very hot,
this heat is conducted towards the earth's surface through water in the ground. The
deeper you drill into the ground, the warmer it becomes, if you drill far enough, you can
get hot water that are several hundred degrees.
The hot water can then be used for energy recovery in a geothermal power plant and
thus produce electricity and hot water for district heating and cooling.
The better alternative
Geothermal energy is an inexhaustible and environmentally friendly energy source. The
technique can be applied anywhere on earth. Production of electricity and heat is
continuous throughout the day, all year round unlike for example wind power, that only
produces electricity when the wind blows. As the oil reserves diminishes we need
alternative renewable energy sources as a replacement. All oil production in the world
falls annually, oil will be available commercially for about 20 years but not at today's
prices, coal extraction is not a good idea environmentally. Carbon stocks last for about
100 years, uranium will last for 20 years. It is a fact that we need to change to
renewable energy sources as soon as possible in order to be able to meet the energy
demand. A geothermal plant uses 1/9:th of the area as a coal power plant and blends
into the environment.
A win-win situation
By using modern technology the energy production is safe and enviroment friendly with
no pollution. Common with other traditional power plants that run on fossil fuels,
construction cost is high but lower than for a conventional coal plant with carbon dioxide
trap. The payback time for a geothermal power plant of 2 MW is short about 6 years,
this depends on size MW and price of sold energy kWh. Due to up scaling effect, every
installed MW costs less for a larger power plant. Life expectancy is at least 100 years.
Geothermal energy production
The principle is very simple, the ground
becomes warmer the closer to the earth's center
we come. By drilling two deep holes (wells) of
about 2-6 km, you can bring up hot water from
hundred to several hundred degrees, the
temperature depends primarily on the depth.
Drill depth depends on geological conditions, in
Hungary it is enough with 2 km deep bore holes
to achieve economically interesting water
temperatures (90-130 ˚ C). Equivalent depths in
Sweden are 5 km.
When the hot water around (90-130 ˚ C)
reaches the surface and is lead into the
geothermal plant it gets heat exchanged against
a secondary heat carrier with lower boiling point
than water (Binary Cycle Technology), the heat
transfers the liquid into steam. The steam drives
a turbine which generates electricity, the hot
water is used for district heating and district
cooling.
The hot water is first used for
industrial applications and then for
domestic/municipal heating/cooling
and in the end for farming.
After the water is depleted of heat,
it is reinjected into the ground in the
second bore hole thus obtaining a
closed system an enviromental
friendly system with no emissions.
The cold water will be reheated
again by the hot bedrock. Through
cracks in the ground, there is a
circulation between the two drill
holes at 2-6 km's depth and the hot
water can be used from the first drill
hole all over again.
Geothermal
Power plant
Hot
water
UP
Cooled
return
water
The ground gets
hotter closer to earths
center.
DOWN
The heat content in the hot water is utilized in steps in a cascade system to enable maximum
heat usage.
The hot water is
first routed to
high temperature
applications then
to municipal and
residential
buildings for
heating/cooling
and tap water,
there after the
water with a
lower heat
content can be
used in thermal
baths and then
on to
greenhouses
and further to a
fish farm.
Another major
new application is
cooling. The hot
water is
converted locally
with an
adsorption heat
pump into cold
liquid which can
be used for
airconditioning,
cooling houses
and large scale
freezers , thereby
saving the need
of expensive and
environmentally
harmful cooling
systems.
Technology and capacity
Conventional power plants, whether heated by coal, gas, oil, biomass, or waste, have in
common that the fuel is burned in a boiler that heats water to steam, the steam drives in
turn a turbine that produces electricity.In a geothermal power plant, no boiler or heating
is necessary, as we have hot water and steam directly from the earth.
In order to generate the maximum amount of electricity it is possible to install more
turbines in series one after another (Flashing). Each step reduces the pressure and
temperature of the steam, which means that less and less can be extracted from it by
ordinary techniques.To increase efficiency, a secondary system (Binary Cycle
Technology) can be used, where a liquid with a lower boiling point than water is used to
provide a higher pressure of steam, and thus more electricity.
Flash-technology water as medium.
Binary Cycle technology with isobutane as medium.
What type of technology is used and their sequence is determined by the geological
conditions and the required output of the plant. The capacity can be expanded over time
by adding new wells.
▪ A 2 MW plant produces power for about 3600 households and district heating/cooling to1660.
▪ A 6 MW plant produces power for about 11 000 households and district heating/cooling to 5000
▪ A 40 MW plant produces power for about 73 000 households and district heating/cooling to 33
000 households.
Based on a 56 m2 living space, usage of 5000 kWh power and 10000 kWh heating /cooling yearly
The larger the plant, the lower is the investment/installed capacity (MW) due to up
scaling effects and the payback time decreases, the profits also increases with capacity.
Geothermal power plant
The geothermal
power plant
requires a small
area and fits well
in the landscape.
Existing district
heating pipes
Location
Geothermal power plants can be built anywhere in the world, but the economic conditions
vary across the world. The largest cost is the bore holes, the deeper the hole is, the more
expensive it is. It is preferable to find areas where there is a good supply of hot water at a
fairly shallow depth. Energeotek can build geothermal power plants all over the world.
Ideal places to build at have a good supply of hot water at a relatively shallow depth, 2
km and a densely populated country, which gives a good market for district heating and
cooling.
This is unique.
Energeotek’s technology is capable of producing electricity from low temperature water,
from temperatures as low as ~50 °C.
There are operational facilities in Europe using a variety of techniques, but none have
combined the entire chain of techniques to maximize the heat utilization. A plant that
produces only electricity, another that manufactures heating, some do not return
the water into the ground and that is causing problems with both subsidence, long-term
sustainability and enviromental impact. Yet there is no geothermal power plant with
completely closed system, which utilizes all the energy. Energeotek offers a new system
service innovation with turnkey facilities, which can contribute to self sustainable cities,
municipality in terms of energy and food.
Market
Geothermal power plants can be built worldwide. To build near medium-sized cities,
newly built residential areas and process industries, is preferred in order to use district
heating resourcefully. Construction of the plant is done in cooperation with the city /
municipality at each site. The plants are connected to the grid in order to sale the
electricity. The interest in district heating and district cooling is increasing, as the fossil
fuel prices are rising and becoming more unpredictable. Applications that use cooling is
expected to increase constantly.
Schedule
A presurvey takes 6 months, during this time, specific data are collected and compiled
concerning the planned geothermal power plant. This information is used to make an
accurate estimation of the project schedule and the financial plan for investments, costs,
payback time and profit margin that the project will require. Total time for the project is
1.5-3 years, dependent on local authorities, that is time required to receive different
permits in given country.
Contact information
For more information, do not hesitate to contact us.
Investor relations
Energeotek AB
Enspännarvägen 1
131 52 Nacka Strand
Sweden
Tel: +46 708 41 35 35
Email: [email protected]