Patent Publication Number: US-2006010867-A1

Title: Individual cogeneration plant

Description:
TECHNICAL FIELD AND BACKGROUND INVENTION  
      The invention relates to an individual cogeneration plant that can provide power to an individual structure, such as a residence, using an independent energy source, or when the independent energy source is not available, by other energy sources such as stored hydrogen gas or natural gas. In addition, the individual cogeneration plant can store unneeded energy for future use, or transfer it to a main power grid. The invention includes a control unit for determining whether the cogeneration plant generates energy using the independent energy source or imports energy from an external source, and whether unneeded energy is stored or transferred. The control units makes such determinations based on several factors such as the availability of the independent energy source, the cost of external energy sources, and the price paid for energy transferred out of the cogeneration plant.  
      In an effort to reduce pollution and conserve finite energy sources like petroleum and natural gas, and in response to the steadily rising cost of such energy sources, a number of prior art inventions have been made for utilizing solar energy to provide power to a residence or other structure. For example, U.S. Pat. No. 4,026,267 to Coleman discloses a solar energy apparatus for gathering and transmitting solar radiation to an energy storage area. The apparatus includes a wide-angle lens to focus solar energy on an end of an optical fiber bundle. U.S. Pat. No. 5,501,743 to Cherney discloses a fiber optical solar power generating system having a tower outside a structure to be supplied with solar energy, and a plurality of collectors.  
      The above prior art inventions disclose devices for utilizing solar energy to provide power to a structure, however, there are times when atmospheric conditions deny a sufficient supply of solar energy. In such a situation, the structure must be powered by another energy source, or be deprived of power altogether. As such, it is generally desirable for a solar energy apparatus to be alternatively powerable by other energy sources such as natural gas or stored hydrogen gas, or to allow the structure to be powered by electricity from a main power grid. Furthermore, as conditions change, such as atmospheric conditions and economic conditions relating to the supply and demand of various power sources, the economic desirability of operating using solar energy rather than another energy source, fluctuates as well. It would therefore be desirable to determine the optimal energy source for an energy producing apparatus based on such varying factors and to run the energy producing apparatus accordingly.  
     SUMMARY OF THE INVENTION  
      Therefore, it is an object of the present invention to provide a system that can produce energy for a structure using a renewable energy source such as solar energy, and can be alternatively powered using another energy source such as natural gas or hydrogen gas stored in the system, or electricity provided by an external main power grid.  
      Another object of the present invention is to provide a system that can provide power to an individual structure using a renewable energy source such as solar energy, and can store unneeded power in the form of hydrogen gas, or transfer the unneeded power to an external main power grid.  
      These and other objectives of the present invention are achieved by providing a system for providing power having a collector for collecting solar energy and transmitting heat generated from the solar energy, and a boiler in communication with the collector and having water for generating steam from the heat transmitted from the collector. A generator communicates with the boiler for generating electricity from the steam generated by the boiler, and unused electricity generated by the system can be transformed into storable energy for future use. As such, unused electricity can be stored in the system or transferred out of the system.  
      According to a preferred embodiment of the invention, the unused electricity transferred out of the system is transferred to a main power grid.  
      According to another preferred embodiment of the invention, the collector includes a solar dish and a focuser for collecting the solar energy.  
      According to yet another preferred embodiment of the invention, the collector includes a fiber optic cable for transmitting the heat generated by the solar energy.  
      According to yet another preferred embodiment of the invention, the collector includes a plurality of mirrors for transmitting the heat generated by the solar energy.  
      According to yet another preferred embodiment of the invention, the collector includes a fresnel lens for collecting the solar energy.  
      According to yet another preferred embodiment of the invention, the collector includes a fiber optic cable for transmitting the heat generated by the solar energy.  
      According to yet another preferred embodiment of the invention, the collector includes a plurality of mirrors for transmitting the heat generated by the solar energy.  
      According to yet another preferred embodiment of the invention, the boiler is connected to the collector and adapted for receiving heat transmitted by the collector.  
      According to yet another preferred embodiment of the invention, the boiler includes burners for receiving heat to convert the water to steam.  
      According to yet another preferred embodiment of the invention, the generator includes a steam turbine and an electrical generator, the steam turbine drives the electrical generator.  
      According to yet another preferred embodiment of the invention, the unused electricity stored in the system is stored as hydrogen gas.  
      According to yet another preferred embodiment of the invention, the system generates hydrogen gas from water, and unused electricity powers the generation of the hydrogen gas from water and the hydrogen gas is stored for future use as energy.  
      According to yet another preferred embodiment of the invention, the system includes a control unit so that a user can control whether unused electricity is stored in the system or transferred out of the system.  
      According to yet another preferred embodiment of the invention, the system includes a positioning device for positioning the collector in a position suitable for receiving solar energy.  
      According to yet another preferred embodiment of the invention, the system supplies power to a structure, and the system is connected to a power grid supplying power to a plurality of structures. Power transferred out of the system can be transferred to the power grid.  
      According to yet another preferred embodiment of the invention, the system is connected to a natural gas source, so that natural gas can be supplied to the system when solar energy is unavailable.  
      According to yet another preferred embodiment of the invention, the natural gas source is connected to the boiler for providing an alternative energy source to the boiler when solar energy is unavailable.  
      According to yet another preferred embodiment of the invention, the system is powerable by solar energy, stored hydrogen gas, natural gas and electricity provided by an external power grid.  
      According to yet another preferred embodiment of the invention, a control unit selects the energy source for powering the structure based on one or more predetermined factors, such as atmospheric conditions, cost of the electricity from the external power grid, cost of the natural gas, price paid for power transferred to the external power grid, and price paid for the stored hydrogen gas.  
      According to yet another preferred embodiment of the invention, the control unit determines whether unused electricity will be stored as hydrogen gas or transferred out of the system based on one or more predetermined factors, such as atmospheric conditions, cost of the electricity from the external power grid, cost of the natural gas, price paid for power transferred to the external power grid, and price paid for the stored hydrogen gas.  
      According to yet another preferred embodiment of the invention, the system includes a collector for collecting energy from an energy source, and a generator for generating electricity from the energy collected by the collector. Unused electricity is transformed into storable energy for future use, and the system is connected to an external power grid and power is transferable between the system and the power grid so that unused electricity can be stored in the system for future use or transferred to the power grid.  
      According to yet another preferred embodiment of the invention, a system for providing power includes an individual cogeneration plant adapted for providing power to a structure using an independent energy source. The cogeneration plant is in communication with an external power grid in communication with the structure so that power can be supplied to the structure by the individual cogeneration plant and the external power grid. A control unit communicates with the individual cogeneration plant for determining an optimal setting for the individual cogeneration plant based on one or more predetermined factors such as atmospheric conditions, cost of the electricity from the external power grid, cost of the natural gas, price paid for power transferred to the power grid, and price paid for stored hydrogen gas.  
      According to yet another preferred embodiment of the invention, the control unit determines whether the individual cogeneration plant is powered by the independent energy source or by the power grid.  
      According to yet another preferred embodiment of the invention, the control unit includes a computer program.  
      According to yet another preferred embodiment of the invention, the individual cogeneration plant can store unused power for future use.  
      According to yet another preferred embodiment of the invention, power is transferable between the individual cogeneration plant and the power grid, so that the unused power can be stored by the individual cogeneration plant for future use or transferred to the power grid.  
      According to yet another preferred embodiment of the invention, the control unit determines whether the unused power is stored by the individual cogeneration plant for future use or transferred to the power grid.  
      According to yet another preferred embodiment of the invention, a system for providing power includes a plurality of individual cogeneration plants. Each of the individual cogeneration plants provides power to a structure using an independent energy source. The individual cogeneration plants communicates with an external power grid, which is in communication with the structure so that power can be provided to the structure by the individual cogeneration plant and the external power grid. Each of a plurality of individual control units communicates with a respective individual cogeneration plant and maintains information relating to the operation of the respective individual cogeneration plant. A master control unit communicates with the external power grid and the plurality of individual control units so that information is exchanged between the master control unit and the plurality of individual control units. The master control unit determines an optimal setting of each of the individual cogeneration plants.  
      According to yet another preferred embodiment of the invention, the information received from the individual control units includes information such as atmospheric conditions, energy output capabilities and a desired price for energy transferred. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      Some of the objects of the invention have been set forth above. Other objects and advantages of the invention will appear as the invention proceeds when taken in conjunction with the following drawings, in which:  
       FIG. 1  is a schematic view of an individual cogeneration plant according to a preferred embodiment of the invention;  
       FIG. 2  is a schematic view of an individual cogeneration plant according to another preferred embodiment of the invention;  
       FIG. 3  is a schematic view of an individual cogeneration plant according to yet another preferred embodiment of the invention;  
       FIG. 4  is a schematic view of an individual cogeneration plant according to yet another preferred embodiment of the invention; and  
       FIG. 5  is a schematic view of a system for providing power comprising a plurality of individual cogeneration plants according to a preferred embodiment of the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT AND BEST MODE  
      Referring now specifically to the drawings, a preferred embodiment of the individual cogeneration plant according to the present invention is illustrated in  FIG. 1 , and shown generally at reference numeral  10 . The individual cogeneration plant  10  generally comprises a solar energy collector  11 , a boiler  12 , a steam turbine  13  and an electric generator  14 .  
      The collector  11  comprises a dish  15 , a focuser  16  positioned at the center of the dish  15 , and a fiber optic cable  17  also positioned at the center of the dish  15  on the opposite side of the focuser  16 . The fiber optic cable  17  connects the dish  15  to the boiler  12 . The dish  15  and the focuser  16  direct solar radiation from the sun “S” into the fiber optic cable  17 . The collected solar radiation travels through the fiber optic cable  17  to the boiler  12 , which has a supply of water. The collected solar energy heats the boiler  12 , which creates steam from the water that drives the steam turbine  13 . The steam turbine  13  then drives the electric generator  14  to create useable power in the form of electricity that can be used in a structure  21 . As used in this application, the term structure refers broadly to any kind of building, including a house, apartment or business. A steam discharge unit  18  allows for the escape of excess steam.  
      The useable power satisfies the typical power needs of the structure  21 , such as electricity for lights, appliances, heating and air conditioning. If more power is generated than what is needed to satisfy the current power needs of the structure  21 , the excess power can be either stored within the cogeneration plant  10  or transferred to an external main power grid  23 . The main power grid  23  is a conventional power plant providing electricity to a plurality of structures across a large geographic area. If the excess power is to be stored, it is directed to an electrolysis device  24  where it is used to provide the necessary electricity for triggering electrolysis, which creates hydrogen gas from water. The hydrogen gas is then transferred to a hydrogen gas storage unit  25 , where it can be stored until needed for a particular application. The stored hydrogen gas  25  can be used in place of solar energy, to generate heat for the boiler  12 , and thereby power the cogeneration plant  10 . Alternatively, the stored hydrogen gas  25  can be used to power hydrogen powered devices  26 , such as automobiles, laptop computers, cell phones and Segueway vehicles.  
      Preferably, a natural gas reservoir  27  is connected to the boiler  12 , and provides another alternative energy source for powering the cogeneration plant  10 . The natural gas can be directed to the boiler  12  to generate heat creating steam for the steam turbine  13 . Alternatively, the stored hydrogen gas can be fed into an existing pipeline that connects the structure  21  to a reservoir, such as the pipeline for the natural gas reservoir  27  if natural gas is no longer being used, or a new pipeline that connects the structure  21  to a reservoir, depending on the price of hydrogen gas and the preferences of the user. As such, hydrogen gas may come from a pipeline to feed the boiler, again depending on price and user preferences.  
      The structure  21  is preferably in communication with the main power grid  23  to provide yet another alternative energy source for the structure  21 . As such, power can be supplied to the structure  21  by the main power grid  23 , rather than the cogeneration plant  10 .  
      Preferably, a control unit  28  processes relevant information to determine the optimum mode in which the cogeneration plant  10  should operate at any given time. The control unit  28  preferably comprises a computer program that considers factors such as atmospheric conditions (i.e. the amount of available sunlight), the amount of stored energy available, the cost of available natural gas, and the cost of electricity supplied by the main power grid  23  to determine whether the structure  21  is supplied power from the individual cogeneration plant  10  or the main power grid  23 . If the structure  21  is supplied power from the individual cogeneration plant  10 , then the control unit  28  determines whether the individual cogeneration plant  10  is powered by solar energy collected by the collector  11 , stored hydrogen gas  25 , or natural gas  27 . In addition, if excess power is created by the cogeneration plant  10 , then the control unit determines whether the excess power is directed to the electrolysis device  24  for storage as hydrogen gas, or transferred to the main power grid  23 .  
      For example, if present atmospheric conditions are such that there is not enough sunlight to supply adequate solar energy to the collector  11 , then the control unit  28  would opt for power to be supplied by another energy source. The control unit  28  could be programmed so that in this situation it would opt for the cogeneration plant  10  to use its reserve of stored hydrogen gas  25  until completely depleted or reaching a certain minimum level, at which time the cogeneration plant  10  would run on natural gas or the structure  21  would be powered by electricity supplied by the main power grid  23 , depending on which was cheaper-natural gas or electricity from the power grid  23 . Alternatively, the control unit  28  could be programmed such that natural gas or electricity from the power grid  23  would be utilized if the price for either was below a certain maximum price value, and if neither was below the maximum price, then the stored hydrogen gas  25  would be used to power the cogeneration plant  10 .  
      In addition, the control unit  28  determines whether excess power is stored as hydrogen gas  25  or transferred to the main power grid  23 . The control unit  28  could be programmed such that the excess power is stored as hydrogen gas unless the price paid by the main power grid  23  for the excess power is at or above a predetermined set minimum price. Alternatively, the control unit  28  could be programmed such that all excess power is directed to electrolysis  24  for storage as hydrogen gas until the hydrogen gas storage unit  25  is full, at which time any excess power is transferred to the main power grid  23 . Of course, there are many other possibilities for programming the control unit  28  that would be apparent to those skilled in the art.  
      While the cogeneration plant  10  is preferably adapted for utilizing solar energy, the cogeneration plant  10  could be modified to utilize other renewable energy sources such as wind as would be apparent to those skilled in the art. Such a modification would require using a collector adapted for collecting and transferring wind energy.  
      The individual cogeneration plant  10  gives a homeowner the choice of how to power his or her home, depending on current utility prices and other factors. The homeowner can power his home by sunlight when available, by stored hydrogen gas, by natural gas or by the main power grid  23 . The chart below illustrates the homeowner&#39;s power options with the cogeneration plant  10 .  
                                               Extra Power       Home Power Primary   Home Power   Created by       Source   Secondary Source   Cogeneration Plant                  Individual cogeneration   Main Power Grid   Back-Feed Main       plant fed by Sunlight       Power Grid       Individual cogeneration   Main Power Grid   Create and Store       plant fed by Sunlight       Hydrogen               from Water       Individual cogeneration   Main Power Grid       plant fed by Hydrogen       Individual cogeneration   Main Power Grid       plant fed by Natural Gas       Main Power Grid   Individual cogeneration   Back-Feed Main           plant fed by Sunlight   Power Grid       Main Power Grid   Individual cogeneration   Create and Store           plant fed by Sunlight   Hydrogen               from Water                  
 
      As shown in the above chart, the cogeneration plant  10  can be the primary or secondary source of power for the homeowner. As the primary source of power, the individual cogeneration plant  10  would use sunlight, hydrogen or natural gas to fire the boiler  12 . This option gives the homeowner the ability to choose his or her power source depending on current utility prices. This also gives the homeowner the ability to run “off-grid” in the case of power outages due to weather or other factors. The cogeneration plant  10  reduces the homeowners utility bills, feeds electricity back into the main power grid  23 , provides the homeowner with a backup source of power in the event of a power failure, and creates hydrogen from water.  
      Another preferred embodiment of the invention is illustrated in  FIG. 2 , and shown generally at reference numeral  30 . The individual cogeneration plant  30  is identical to the previously described cogeneration plant  10 , except that it includes a collector  31  having a series of mirrors  37   a ,  37   b ,  37   c  instead of a fiber optic cable. The mirrors  37   a ,  37   b ,  37   c  are positioned to direct the solar radiation collected by the dish  15  and focuser  16  to the boiler  12  to heat the boiler  12 . The individual cogeneration plant  30  is identical to the above described cogeneration plant  10  in all other respects, and therefore all other features are denoted with identical reference numerals and are not discussed in further detail here.  
      Yet another preferred embodiment of the invention is illustrated in  FIG. 3 , and shown generally at reference numeral  50 . The individual cogeneration plant  50  is identical to previously described cogeneration plant  10 , except that it includes a collector  51  comprising a fresnel lense  55  for collecting solar radiation. The fiber optic cable  17  connects the fresnel lense  55  to the boiler  12 . The collected solar radiation travels through the fiber optic cable  17  to the boiler  12 , and heats the boiler  12 . The individual cogeneration plant  50  is identical to the above described cogeneration plant  10  in all other respects, and therefore all other features are denoted with identical reference numerals and are not discussed in further detail here.  
      Yet another preferred embodiment of the invention is illustrated in  FIG. 4 , and shown generally at reference numeral  70 . The individual cogeneration plant  70  is identical to previously described cogeneration plant  10 , except that it includes a collector  71  having a fresnel lense  75  and a series of mirrors  77   a ,  77   b ,  77   c . The mirrors  77   a ,  77   b ,  77   c  are positioned to direct the solar radiation collected by the fresnel lense  75  to the boiler  12  to heat the boiler  12 . The individual cogeneration plant  70  is identical to the above described cogeneration plant  10  in all other respects, and therefore all other features are denoted with identical reference numerals and are not discussed in further detail here.  
      In yet another preferred embodiment of the invention, a plurality of individual cogeneration plants  10 ,  10 ′,  10 ″ are provided, with each individual cogeneration plant  10 ,  10 ′,  10 ′ operatively connected to supply power to a structure  21 ,  21 ′,  21 ″, respectively, and to each other, as shown in  FIG. 5 . Each cogeneration plant  10 ,  10 ′,  10 ″ is linked to an individual control unit  28 ,  28 ′,  28 ″, respectively. The individual control units  28 ,  28 ′,  28 ″ communicate with each other and a master control unit  88 , which is linked to the main power grid  23 . The power grid  23  can provide power to each structure  21 ,  21 ′,  21 ″, and can receive power from each cogeneration plant  10 ,  10 ′,  10 ″. The master control unit  88  collects and stores data relating to the main power grid  23 , such as the price that is currently being charged by the main power grid  23  for supplying power, the price currently being paid for power supplied to the power grid  23 , and the current power supply and capabilities of the power grid  23 . Likewise, each of the individual control units  28 ,  28 ′,  28 ″ collects and stores information relating to its respective individual cogeneration plant  10 ,  10 ′,  10 ″, such as atmospheric conditions, the current available power output of the respective individual cogeneration plant, the amount of stored hydrogen gas, the amount of natural gas available to the respective individual cogeneration plant, and the current power requirements of the particular structure.  
      The individual control units  28 ,  28 ′,  28 ″ communicate to the master control unit  88  and with each other the current power requirements and capabilities of each respective individual cogeneration plant  10 ,  10 ′,  10 ″, as well as the other related information described above for each individual cogeneration plant  10 ,  10 ′,  10 ″. The master control unit  88  processes the information transmitted to it by the individual control units  28 ,  28 ′,  28 ″ and the information it maintains relating to the main power grid  23 , and makes a determination as to the most efficient way to power the structures  21 ,  21 ′,  21 ″. For example, if the information transmitted to the master control unit  88  indicates that due to atmospheric conditions a particular individual cogeneration plant  10  is generating excess power, while another individual cogeneration plant  10 ′ does not currently have sufficient power to power its respective structure  21 ′, the master control unit  88  can either direct the first cogeneration plant  10  to transfer its excess power to the second cogeneration plant  10 ″ or transfer the needed power from the power grid  23  to the second cogeneration plant  10 ″. The determination as to whether needed power is supplied by the power grid  23  or another cogeneration plant can be based on the respective cost for each power source.  
      The control units  28 ,  28 ′,  28 ″ transmit to the master control unit  88  a set minimum price at which each cogeneration plant  10 ,  10 ′,  10 ″ will sell its excess power to the power grid  23  and the other cogeneration plants  10 ,  10 ′,  10 ″. The master control unit  88  compares these prices and the price of power from the power grid  23  to determine the most cost effective means for powering the structures  21 ,  21 ′,  21 ″. If the cost of power from an individual cogeneration plant  10  is lower than from the power grid  23 , the master control unit  88  directs the first cogeneration plant  10  to transfer its excess power to the second cogeneration plant  10 ′. If the cost of power from the first cogeneration plant  10  is higher than the price of power from the power grid  23 , then the master control unit  88  directs the power grid  23  to supply the second cogeneration plant  10 ′ with its needed power.  
      Other factors can be considered by the master control unit  88 , such as the cost and availability of natural gas, and the availability of stored hydrogen gas for each individual cogeneration plant  10 ,  10 ′,  10 ″. The master control unit  88  can be programmed so that at times when solar energy is not available, each individual cogeneration plant  10 ,  10 ″,  10 ″ uses its supply of stored hydrogen gas if the price of power supplied from other cogeneration plants or the power grid  23 , or available natural gas, exceeds a predetermined maximum price.  
      Alternatively, each individual control unit  28 ,  28 ′,  28 ″ has the power to make the ultimate decision as to how its respective individual cogeneration plant  10 ,  10 ′,  10 ″ operates and provides power to its respective structure  21 ,  21 ′,  21 ″ at any given time. Each individual control unit  28 ,  28 ′,  28 ″ is programmed to communicate a minimum selling price for the excess power of its respective individual cogeneration plant  10 ,  10 ′,  10 ″, and a maximum purchasing price at which the individual control unit  28 ,  28 ′,  28 ″ will purchase excess power from the other cogeneration plants  10 ,  10 ′,  10 ″ or the main power grid  23 . This information is communicated to the master control unit  88  and the other individual control units  28 ,  28 ′,  28 ″, either directly or through the master control unit  88 . Likewise, the master control unit  88  communicates to the individual control units  28 ,  28 ′,  28 ″ a minimum selling price for power from the main power grid  23 , and a maximum purchasing price at which the main power grid  23  will purchase excess power from the cogeneration plants  10 ,  10 ′,  10 ″. Each individual control unit  28 ,  28 ′,  28 ″ processes this information, along with other relevant factors such as current atmospheric conditions, and the current availability of natural gas and stored hydrogen gas for its respective individual cogeneration plant  10 ,  10 ′,  10 ″, to determine an optimum setting for the respective individual cogeneration plant  10 ,  10 ′,  10 ″ to provide needed power to its respective structure  21 ,  21 ′,  21 ″.  
      For example, the user of one individual cogeneration plant  10  may decide that he will pay no more than $0.08 per kilowatt hour for power from external sources, and programs his respective individual control unit  28  accordingly. Current atmospheric conditions are such that there is not enough solar energy available for the cogeneration plant  10  to adequately meet the power demands of its respective structure  21 . Meanwhile, the individual control unit  28 ′ for another individual cogeneration plant  10 ′ communicates that it will sell its excess power for $0.06 per kilowatt hour, and the individual control unit  28 ″ for yet another individual cogeneration plant  10 ″ communicates that it will sell excess power for $0.07. In addition, the master control unit  88  communicates that the power grid  23  will sell power for $0.09 per kilowatt hour, and the price of available natural gas is $0.08. Under these conditions, the individual control unit  28  would determine that in order to meet the power demands of its respective structure  21 , power will first be imported from the second cogeneration plant  10 ′ at a rate of $0.06 per kilowatt hour, and if additional power is needed, then excess power from the third cogeneration plant  10 ″ is imported at the price of $0.07. If the excess power available from the other cogeneration plants  10 ′,  10 ″ does not completely satisfy the power demands of the structure  21 , then natural gas is used at a rate of $0.08 per kilowatt hour. If all available natural gas is utilized, the cogeneration plant  10  will not import power from the main power grid  23  since its price of $0.09 per kilowatt hour exceeds the maximum price set by the individual control unit  28 . Instead, the cogeneration plant  10  will utilize its reserve of stored hydrogen gas. In addition, under this scenario, the master control unit  88  may decide to purchase excess power from the second and third cogeneration plants  10 ′,  10 ″ at rates of $0.06 and $0.07 per kilowatt hour, respectively, if the power can then be resold by the main power grid  23  at a rate of $0.09 per kilowatt hour.  
      While  FIG. 5  illustrates a system utilizing three individual cogeneration plants  10 ,  10 ′,  10 ″, there is no limit to the number of cogeneration plants that can be connected in a single system. If a large number of homeowners had individual cogeneration plants, they could serve as a distributed source of power that back-feeds the main power grid in the event of local or national emergencies such as grid-failure, terrorist attack or bad weather. Power plants and power equipment would be less-likely terrorist targets due to the fact that the individual cogeneration plants could provide power in the event of a disruption in service of the main power grid. The invention may also eliminate the need to upgrade the national power-grid as cities could operate without power from the national grid if enough individual cogeneration plants were utilized to provide a sufficient supply of power. As such, a city could be it&#39;s own power source. In the event that the load increased on the national grid, a message could be sent to the individual cogeneration plants in the affected area and they could ramp up power production. The invention enables individuals to participate in the wholesale power market.  
      An individual cogeneration plant and methods of using same are disclosed above. Various embodiments of the invention can be made without departing from its scope. Furthermore, the foregoing description of the preferred embodiment of the invention and the best mode for practicing the invention are provided for the purpose of illustration only and not for the purpose of limitation- the invention being defined by the claims.