CN108416696A - Region electric power free transaction method based on block chain technology - Google Patents
Region electric power free transaction method based on block chain technology Download PDFInfo
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses the region electric power free transaction methods based on block chain technology, belong to customer side field of energy management, more particularly to polynary user collaborative energy management method in a kind of industrial park, it includes：Data collection, plan of travel report, predict photovoltaic output electricity consumption curve, build region energy administrative model, formulate coordinated management strategy and under issue a command to user and respond；The beneficial effects of the present invention are：Each resource such as the distributed generation resource, electric vehicle of user, energy storage, controllable burden in cooperative scheduling industrial park realizes the intelligent power of user in garden for the purpose of economy is optimal and maximizes consumption new energy.
Description
Technical field
The invention belongs to sales market field, more particularly to a kind of region electric power free transaction based on block chain technology
Method.
Background technology
Since sales market opens, a wide range of popularization of distributed energy storage and photovoltaic, user can not only pass through in addition
Itself electricity consumption behavior is adjusted, and can be by the way that remaining capacity online is sold to other users or power grid.
In traditional transaction way, trading program is formulated by market manager (or control centre), so they possess
To the excessive influence power of electricity transaction, electric power free transaction can not be truly realized.Block chain technology have data transparency,
Decentralization, the feature for going trustization, can effective solution this problem.
Invention content
The purpose of the present invention is：A kind of region electric power free transaction method based on block chain technology is provided, area should be based on
While reducing transaction risk, simplification pays, settles accounts, auditing, completing a business transaction the complicated and numerous of process the trade mode of block chain technology
Trivial, user's unrestricted choice electricity supplier can also adjust itself electricity consumption behavior, and extra electricity consumption is surfed the Internet, and realize interests most
Bigization solves the problems, such as that sales market opens lower electricity transaction.
The principle of the present invention is：Energy pool concept is built based on block chain technology, power grid is as agent to city of supplier
Field access is authenticated, and user independently selects electricity provider, together with this by consulting the contract information issued in energy pond
When, extra electricity can also be surfed the Internet, as sale of electricity side, participate in electricity transaction market.
To solve the above-mentioned problems, it includes specifically that technical solution of the invention, which is the region electric power free transaction method,
Steps are as follows：
S1：Before carrying out electricity transaction, supplier's upload information is completed registration or is logged in；
S2：It carries out verifying whether to meet entry criteria using block chain technology, meets and then enter S3, otherwise compulsory withdrawal；
S3：Supplier is approved to enter alliance's chain, passes through Transaction Information before inquiry, firm offer；
S4：Supplier will be written in block chain comprising the treaty content of quotation information, electricity, account address and be published to real-time energy
It measures in trading pit；
S5：It needs the user of power purchase by checking the information in power exchange pond, and is compared selection with power grid electricity price and is suitble to
The scheme of oneself signs intelligent contract with private key, concludes the transaction；
S6：Intelligent electric meter records customer transaction electricity, and block chain is written；
S7：Safe veritification is carried out, once by checking, meets the treaty content then Automatic-settlement electricity charge, otherwise breaks one's promise according to contract
Punishment；
S8：Once transaction is reached, power grid presses type of transaction extraction section commission as agent.
Wherein, the concept of the supplier includes：The biography of power plant, wind park, photovoltaic plant, energy-accumulating power station as source
System Power Generation, and contain the user that extra electricity can surf the Internet.
Wherein the block chain technology is：Block chain is considered as the distributed data base of a decentralization, the data
The data block that library is generated by a string using cryptography method orderly links, and includes to be generated in certain time in block
The datalogging information that can not be tampered；Specifically, block consists of two parts：1）Block head is linked to the block of front, and
Integrality is provided for block chain, each block head carries timestamp, as unique label, to ensure tracing for block chain
Property；2）Block main body has recorded newer data information in network, specifically includes transaction record number, user's id information, electrical supplier
Id information, electricity of merchandising, transaction amount.
Wherein, the entry criteria is：
S21：Want as supplier extra electricity selling situation for user
S21.1 by intelligent electric meter metering user can electricity volume meet certain requirements；
If S21.2 user participates in business as supplier for the first time, a joint declaration is signed by block chain technology, wherein
Include the regulation and the credit letter of commitment to rights and obligations；
S21.3 user as supplier if not participate in business, by the transaction record before inquiry, if breaking one's promise record for the first time
It is less than 3 times, user can continue to participate in transaction；
S22：The case where for big power station as supplier
There is certain power generation scale in the power plants S22.1；
The power plants S22.2 meet the index of carbon emission in environmental protection and energy saving；
If the power plants S22.3 are participated in business as supplier for the first time, a joint declaration is signed by block chain technology,
Include the regulation and the credit letter of commitment to rights and obligations；
The power plants S22.4 as supplier if not participate in business, by the transaction record before inquiry, if without breaking one's promise for the first time
Record, can be used as supplier and continues to participate in transaction.
Wherein, the supply Bidding uses linear bidding function, and steps are as follows for detailed process：
S31 collects the quotation information of historical trading by consulting the information in regional network；
S32 generates N number of quotation scene of other suppliers using Monte Carlo EGS4 method；
S33 initializes itself quotation coefficienta i ,b i Particle；
S34 calculates the fitness function under i-th of scene；
S35 Population Regenerations optimum individual simultaneously carries out particle update；
S36 judges whether to meet iterations, is to enter step S37, otherwise enters S34；
S37 judges whether to have traversed all scenes, is then to enter S38, otherwise enters S33；
S38 takes desired value to the quotation optimal coefficient solved under each scene；
S39 exports optimum price quotation.
Wherein, the Security Checking is as follows：
S71 systems by the electricity in block chain, are compared with the intelligent contract of signing automatically, S72 are entered step if meeting the requirements,
Otherwise enter S73；
S72 transaction amount squeezes into reciprocal account address in the form of bit coin, and both parties will receive based on block chain technology
Intelligent digital bill；
The electricity of S73 transaction is unsatisfactory for contractual requirement, and point situation carries out
S73.1 transaction electricity is unsatisfactory for contractual requirement, and the seller need to compensate purchaser and in addition buy the price difference of electricity to power grid, and have one
Secondary record of breaking one's promise, in the case, the electricity transaction of both sides carry out Automatic-settlement according to the electricity merchandised；
The electricity of S73.2 transaction exceeds contractual requirement, the part that transaction electricity exceeds, and user pays by 1.05 times of agreement electric rate
Extra electricity.
Wherein, the standard that the power grid commission extracts is classified by type of transaction, specific as follows：
S81 differentiates that type of transaction, daily settlement power purchase agreement enter S82, and the transaction of monthly billing power purchase enters S83；
S82 is for the power purchase agreement of daily settlement, 3 grades of expenses standard point
S82.1 Day Trading electricity is less than 100 kilowatt hours, is free of charge；
822.2 Day Trading electricity are between 100 kilowatt hours and 200 kilowatt hours, by 1% charge of transaction amount；
S82.3 Day Trading electricity is more than 200 kilowatt hours, by 3% charge of transaction amount；
S83 is for the power purchase agreement of monthly billing, 5 grades of expenses standard point
Electricity of merchandising the S83.1 months is less than 1000 kilowatt hours, is free of charge；
823.2 months transaction electricity, between 5000 kilowatt hours, are charged in 1000 kilowatt hours by the 3% of transaction amount；
Electricity of merchandising the S83.3 months is more than 5000 kilowatts between 10000 kilowatt hours, by 9% charge of transaction amount；
Electricity of merchandising the S83.4 months is more than 10000 kilowatts between 20000 kilowatt hours, by 11% charge of transaction amount；
Electricity of merchandising the S83.5 months is more than 20000 kilowatt hours, by 17% charge of transaction amount.
Compared with prior art, the invention has the advantages that：
1. the decision of transaction is mainly undertaken by participant in the market, reduce the decision work of system call person in entire process of exchange
Make, while can also increase the transparency of process of exchange, user can unrestricted choice electricity supplier, itself can be adjusted with user and is used
Electric behavior, and extra electricity consumption is surfed the Internet, realize benefit；
2. by the decentralization of block chain and the feature of trustization is gone, as long as any node does not meet the item of intelligent contract
Part all will be unable to enter payment link, reduce the risk of transaction；
3. power exchange platform is built using block chain technology, while safe and reliable, it is thus also avoided that conventional payment, clearing,
It audits, complete a business transaction the complicated and cumbersome of process, improve the efficiency of payment process.
4. block chain has the characteristics that data transparency, reliable, decentralization, contract execute automation and trackability,
Of low cost, open and clear system platform is provided to electricity transaction.
Description of the drawings
Fig. 1 is the overview flow chart of the region electric power free transaction method based on block chain technology of the present invention；
Fig. 2 is the transaction schematic diagram of the region electric power free transaction method based on block chain technology of the present invention；
Fig. 3 is the electricity transaction block chain schematic diagram of the region electric power free transaction method based on block chain technology of the present invention；
Fig. 4 be the present invention the region electric power free transaction method based on block chain technology in supply Bidding determine flow
Figure.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and embodiments, and described embodiment is only the present invention's
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Go out obtained other embodiments under the premise of creative work, belongs to protection scope of the present invention.
As shown in the picture, it includes being as follows to be somebody's turn to do the region electric power free transaction method based on block chain technology：
S1：Before carrying out electricity transaction, supplier needs upload information to complete registration or log in；
S2：It is verified using block chain technology, sees whether meet entry criteria；
S3：Supplier is approved to enter alliance's chain, passes through Transaction Information before inquiry, firm offer；
S4：Supplier will be written in block chain comprising the treaty content of quotation information, electricity, account address and be published to real-time energy
It measures in trading pit；
S5：The user of power purchase is compared selection with power grid electricity price and is suitble to oneself by checking the information in power exchange pond
Scheme, sign intelligent contract with private key, conclude the transaction；
S6：Intelligent electric meter records customer transaction electricity, and block chain is written；
S7：Safe veritification is carried out, once meet treaty content, the Automatic-settlement electricity charge；
S8：Once transaction is reached, power grid is as agent's extraction section commission；
Wherein the block chain technology is：Block chain is considered as the distributed data base of a decentralization, the database by
A string of data blocks generated using cryptography method are orderly linked, include in block generate in certain time can not
The datalogging information being tampered；Specifically, block consists of two parts：1）Block head is linked to the block of front, and is area
Block chain provides integrality, and each block head carries timestamp, as unique label, to ensure the trackability of block chain；
2）Block main body has recorded newer data information in network, specifically includes transaction record number, user's id information, electrical supplier ID
Information, electricity of merchandising, transaction amount.
Wherein, the entry criteria that supplier participates in business is specially：
The case where S21 sells extra electricity as supplier for user
S21.1 by intelligent electric meter metering user can electricity volume meet certain requirements；
If S21.2 user participates in business as supplier for the first time, a joint declaration need to be signed by block chain technology,
Include the regulation and the credit letter of commitment to rights and obligations；
S21.3 user as supplier if not participate in business, by the transaction record before inquiry, if breaking one's promise record for the first time
It is less than 3 times, user can continue to participate in transaction；
S22 is directed to the case where big power station is as supplier
The power plants S22.1 need certain power generation scale；
The power plants S22.2 need the index for meeting carbon emission in environmental protection and energy saving；
If the power plants S22.3 are participated in business as supplier for the first time, a joint declaration need to be signed by block chain technology,
Including the regulation and the credit letter of commitment to rights and obligations；
The power plants S22.4 as supplier if not participate in business, by the transaction record before inquiry, if without breaking one's promise for the first time
Record, can be used as supplier and continues to participate in transaction；
Wherein, supply Bidding uses linear bidding function, specific quotation to determine that process step is as follows：
S31 collects the quotation information of historical trading by consulting the information in regional network；
S32 generates N number of quotation scene of other suppliers using Monte Carlo EGS4 method
S33 initializes itself quotation coefficienta i ,b i Particle；
S34 calculates the fitness function under i-th of scene；
S35 Population Regenerations optimum individual simultaneously carries out particle update；
S36 judges whether to meet iterations, is to enter step S37, otherwise enters S34；
S37 judges whether to have traversed all scenes, is then to enter S38, otherwise enters S33；
S38 takes desired value to the quotation optimal coefficient solved under each scene；
S39 exports optimum price quotation；
Wherein, the Security Checking is as follows：
S71 systems by the electricity in block chain, are compared with the intelligent contract of signing automatically, S72 are entered step if meeting the requirements,
Otherwise enter S73；
S72 transaction amount by bit and in the form of squeeze into reciprocal account address, both parties will receive based on block chain technology
Intelligent digital bill；
The electricity of S73 transaction is unsatisfactory for contractual requirement, and point situation carries out
S73.1 transaction electricity is unsatisfactory for contractual requirement, and the seller need to compensate purchaser and in addition buy the price difference of electricity to power grid, and have one
Secondary record of breaking one's promise, in the case, the electricity transaction of both sides carry out Automatic-settlement according to the electricity merchandised；
The electricity of S73.2 transaction exceeds contractual requirement, and the part that transaction electricity exceeds, user need to be by 1.05 times of friendships of agreement electric rate
Receive extra electricity；
Wherein, the specific standards that power grid draws a commission are as follows
S81 differentiates that type of transaction, daily settlement power purchase agreement enter S82, and the transaction of monthly billing power purchase enters S83
S82 is for the power purchase agreement of daily settlement, 3 grades of expenses standard point
S82.1 Day Trading electricity is less than 100 kilowatt hours, is free of charge；
822.2 Day Trading electricity are between 100 kilowatt hours and 200 kilowatt hours, by 1% charge of transaction amount；
S82.3 Day Trading electricity is more than 200 kilowatt hours, by 3% charge of transaction amount；
S83 is for the power purchase agreement of monthly billing, 5 grades of expenses standard point
Electricity of merchandising the S83.1 months is less than 1000 kilowatt hours, is free of charge；
823.2 months transaction electricity, between 5000 kilowatt hours, are charged in 1000 kilowatt hours by the 3% of transaction amount；
Electricity of merchandising the S83.3 months is more than 5000 kilowatts between 10000 kilowatt hours, by 9% charge of transaction amount；
Electricity of merchandising the S83.4 months is more than 10000 kilowatts between 20000 kilowatt hours, by 11% charge of transaction amount；
Electricity of merchandising the S83.5 months is more than 20000 kilowatt hours, by 17% charge of transaction amount.
Embodiment：As shown in Figs 1-4, user surfs the Internet extra electricity as supplier, and the method includes the steps of：
S1：Before carrying out electricity transaction, supplier uploads personal information registration or logs in；
S2：It is verified using block chain technology, sees whether meet entry criteria；
S21 is directed to user as supplier, the case where extra electricity is sold；
S21.1 by intelligent electric meter metering user can electricity volume meet certain requirements；
If S21.2 user participates in business as supplier for the first time, a joint declaration need to be signed by block chain technology,
Include the regulation and the credit letter of commitment to rights and obligations；
S21.3 user as supplier if not participate in business, by the transaction record before inquiry, if breaking one's promise record for the first time
It is less than 3 times, user can continue to participate in transaction；
S3：Supplier is approved to enter alliance's chain, passes through Transaction Information before inquiry, firm offer；
S31 collects the quotation information of historical trading by consulting the information in regional network；
S32 generates N number of quotation scene of other suppliers using Monte Carlo EGS4 method；
S33 initializes itself quotation coefficienta i ,b i Particle；
S34 calculates the fitness function under i-th of scene；
S35 Population Regenerations optimum individual simultaneously carries out particle update；
S36 judges whether to meet iterations, is to enter step S37, otherwise enters S34；
S37 judges whether to have traversed all scenes, is then to enter S38, otherwise enters S33；
S38 takes desired value to the quotation optimal coefficient solved under each scene；
S39 exports optimum price quotation；
S4：Supplier will be written in block chain comprising the treaty content of quotation information, electricity, account address and be published to real-time energy
It measures in trading pit；
S5：It needs the user of power purchase by checking the information in power exchange pond, and is compared selection with power grid electricity price and is suitble to
The scheme of oneself signs intelligent contract with private key, concludes the transaction；
S6：Intelligent electric meter records customer transaction electricity, and block chain is written；
S7：Safe veritification is carried out, once meet treaty content, the Automatic-settlement electricity charge；
S71 systems by the electricity in block chain, are compared with the intelligent contract of signing automatically, S72 are entered step if meeting the requirements,
Otherwise enter S73；
S72 transaction amount by bit and in the form of squeeze into reciprocal account address, both parties will receive based on block chain technology
Intelligent digital bill；
The electricity of S73 transaction is unsatisfactory for contractual requirement, and point situation carries out
S73.1 transaction electricity is unsatisfactory for contractual requirement, and the seller need to compensate purchaser and in addition buy the price difference of electricity to power grid, and have one
Secondary record of breaking one's promise, in the case, the electricity transaction of both sides carry out Automatic-settlement according to the electricity merchandised；
The electricity of S73.2 transaction exceeds contractual requirement, and the part that transaction electricity exceeds, user need to be by 1.05 times of friendships of agreement electric rate
Receive extra electricity；
S8：Once transaction is reached, power grid is as agent's extraction section commission；
S81 differentiates that type of transaction, daily settlement power purchase agreement enter S82, and the transaction of monthly billing power purchase enters S83
S82 is for the power purchase agreement of daily settlement, 3 grades of expenses standard point
S82.1 Day Trading electricity is less than 100 kilowatt hours, is free of charge；
822.2 Day Trading electricity are between 100 kilowatt hours and 200 kilowatt hours, by 1% charge of transaction amount；
S82.3 Day Trading electricity is more than 200 kilowatt hours, by 3% charge of transaction amount；
S83 is for the power purchase agreement of monthly billing, 5 grades of expenses standard point
Electricity of merchandising the S83.1 months is less than 1000 kilowatt hours, is free of charge；
823.2 months transaction electricity, between 5000 kilowatt hours, are charged in 1000 kilowatt hours by the 3% of transaction amount；
Electricity of merchandising the S83.3 months is more than 5000 kilowatts between 10000 kilowatt hours, by 9% charge of transaction amount；
Electricity of merchandising the S83.4 months is more than 10000 kilowatts between 20000 kilowatt hours, by 11% charge of transaction amount；
Electricity of merchandising the S83.5 months is more than 20000 kilowatt hours, by 17% charge of transaction amount.
Claims (7)
1. the region electric power free transaction method based on block chain technology, it is characterised in that the region electric power free transaction method packet
It includes and is as follows：
S1：Before carrying out electricity transaction, supplier's upload information is completed registration or is logged in；
S2：It carries out verifying whether to meet entry criteria using block chain technology, meets and then enter S3, otherwise compulsory withdrawal；
S3：Supplier is approved to enter alliance's chain, passes through Transaction Information before inquiry, firm offer；
S4：Supplier will be written in block chain comprising the treaty content of quotation information, electricity, account address and be published to real-time energy
It measures in trading pit；
S5：It needs the user of power purchase by checking the information in power exchange pond, and is compared selection with power grid electricity price and is suitble to
The scheme of oneself signs intelligent contract with private key, concludes the transaction；
S6：Intelligent electric meter records customer transaction electricity, and block chain is written；
S7：Safe veritification is carried out, once by checking, meets the treaty content then Automatic-settlement electricity charge, otherwise breaks one's promise according to contract
Punishment；
S8：Once transaction is reached, power grid presses type of transaction extraction section commission as agent.
2. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
Step 1 in the concept of supplier include：The conventional electric power generation of power plant, wind park, photovoltaic plant, energy-accumulating power station as source
Quotient, and contain the user that extra electricity can surf the Internet.
3. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
Block chain technology be：
Block chain is considered as the distributed data base of a decentralization, what which was generated by a string using cryptography method
Data block orderly links, and includes the datalogging information that can not be tampered generated in certain time in block；Tool
Body, block consists of two parts：1）Block head is linked to the block of front, and provides integrality for block chain；Each block
Head all carries timestamp, as unique label, to ensure the trackability of block chain；2）Block main body, has recorded in network
Newer data information specifically includes transaction record number, user's id information, electrical supplier id information, electricity of merchandising, transaction amount.
4. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
Entry criteria be：
S21：Want as supplier extra electricity selling situation for user
S21.1 by intelligent electric meter metering user can electricity volume meet certain requirements；
If S21.2 user participates in business as supplier for the first time, a joint declaration is signed by block chain technology, wherein
Include the regulation and the credit letter of commitment to rights and obligations；
S21.3 user as supplier if not participate in business, by the transaction record before inquiry, if breaking one's promise record for the first time
It is less than 3 times, user can continue to participate in transaction；
S22：The case where for big power station as supplier
There is certain power generation scale in the power plants S22.1；
The power plants S22.2 meet the index of carbon emission in environmental protection and energy saving；
If the power plants S22.3 are participated in business as supplier for the first time, a joint declaration is signed by block chain technology,
Include the regulation and the credit letter of commitment to rights and obligations；
The power plants S22.4 as supplier if not participate in business, by the transaction record before inquiry, if without breaking one's promise for the first time
Record, can be used as supplier and continues to participate in transaction.
5. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
It supplies Bidding and uses linear bidding function, steps are as follows for detailed process：
S31 collects the quotation information of historical trading by consulting the information in regional network；
S32 generates N number of quotation scene of other suppliers using Monte Carlo EGS4 method；
S33 initializes itself quotation coefficienta i ,b i Particle；
S34 calculates the fitness function under i-th of scene；
S35 Population Regenerations optimum individual simultaneously carries out particle update；
S36 judges whether to meet iterations, is to enter step S37, otherwise enters S34；
S37 judges whether to have traversed all scenes, is then to enter S38, otherwise enters S33；
S38 takes desired value to the quotation optimal coefficient solved under each scene；
S39 exports optimum price quotation.
6. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
Security Checking be as follows：
S71 systems by the electricity in block chain, are compared with the intelligent contract of signing automatically, S72 are entered step if meeting the requirements,
Otherwise enter S73；
S72 transaction amount squeezes into reciprocal account address in the form of bit coin, and both parties will receive based on block chain technology
Intelligent digital bill；
The electricity of S73 transaction is unsatisfactory for contractual requirement, and point situation carries out
S73.1 transaction electricity is unsatisfactory for contractual requirement, and the seller need to compensate purchaser and in addition buy the price difference of electricity to power grid, and have one
Secondary record of breaking one's promise, in the case, the electricity transaction of both sides carry out Automatic-settlement according to the electricity merchandised；
The electricity of S73.2 transaction exceeds contractual requirement, the part that transaction electricity exceeds, and user pays by 1.05 times of agreement electric rate
Extra electricity.
7. the region electric power free transaction method according to claim 1 based on block chain technology, it is characterised in that described
Power grid commission extract standard classify by type of transaction, it is specific as follows：
S81 differentiates that type of transaction, daily settlement power purchase agreement enter S82, and the transaction of monthly billing power purchase enters S83；
S82 is for the power purchase agreement of daily settlement, 3 grades of expenses standard point
S82.1 Day Trading electricity is less than 100 kilowatt hours, is free of charge；
822.2 Day Trading electricity are between 100 kilowatt hours and 200 kilowatt hours, by 1% charge of transaction amount；
S82.3 Day Trading electricity is more than 200 kilowatt hours, by 3% charge of transaction amount；
S83 is for the power purchase agreement of monthly billing, 5 grades of expenses standard point
Electricity of merchandising the S83.1 months is less than 1000 kilowatt hours, is free of charge；
823.2 months transaction electricity, between 5000 kilowatt hours, are charged in 1000 kilowatt hours by the 3% of transaction amount；
Electricity of merchandising the S83.3 months is more than 5000 kilowatts between 10000 kilowatt hours, by 9% charge of transaction amount；
Electricity of merchandising the S83.4 months is more than 10000 kilowatts between 20000 kilowatt hours, by 11% charge of transaction amount；
Electricity of merchandising the S83.5 months is more than 20000 kilowatt hours, by 17% charge of transaction amount.
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