A 'Detection Bill' is served for:
1. illegal abstraction of electricity or consumption of energy;
2. direct hooking and
3. on account of slowness etc.
Detection bill for dishonest abstraction of electricity is assessed strictly in accordance with the provisions of section 26-A of the Electricity Act, 1910.
In case of direct hooking, whoever is found to have connected his installations, appliances and apparatus with the works of licencee (IESCO), for the purpose of supply of energy without its written consent, commits an offence to be prosecuted under section 39 and 39-A of the Electricity Act 1910, which requires an FIR to be lodged with Police. Further to compensate the loss sustained on account of theft of electricity, in pursuance of provisions of section 48 ibid, a detection/assessment bill is to be served, as per laiddown procedures. The owner or occupier of the premsis which are found, for the time being, connected illegally for the purpose of supply of energy with the works of licencee are liable for the payment of detection/assessment bill prepared and served.
Detection bill on account of slowness is to be served for slowness observed in the meter on mechnical or technical ground. Slowness is checked either with a Check Meter or by getting the meter tested with a appropriate testing equipment. Slowness is only attributed to mechanical or technical faults where ascertained that element of dishonest abstraction or consumption of energy is not involved. Charging on account of slowness continues till the meter is replaced. The period and amount of energy supplied to the consumer is determined/assessed after considering results of Check Meter/testing equipment, consumption pattern, sanctioned load, connected load or any other suitable criteria of the connection.
Although utmost care is exercised in the preparation of detection/assessment bill, however if at all you find any discrepancy or you have any other reservation, please report to your concerning officer
Remember to clear your dues immediately or your electricity connection may be disconnected.

Installments are not admisible at running bill. However installments can be given on arrears of electricity dues outstanding against the consumer and whenever electricity dues are allowed to be paid in installments, interest is charged at the prevailing bank rates.
In case of general connections for arrears amounting to Rs. 2,000. SDO is competent for not more than three equal monthly installments. Arrears amounting to Rs. 10,000. XEN is competent for not more than three equal monthly installments. Arrears amounting to Rs. 100,000. SE is competent for not more than four equal monthly installments. CEO is competent for not more than six equal monthly installments.
It is to be noted that the powers are only exercised in genuine and deserving cases and where the consumer has not defaulted in payment during the last six months. A written undertaking from the consumers concerned is obtained which should say that he would pay the installment bills, along with the current consumption bills regularly and he will not make any further request for the recovery of the electricity dues by installments as a condition precedent to his retaining the electricity connection.

All the disconnected consumers are reconnected only after clearance of outstanding dues. A reconnection order (RCO) is authorized by concerning Customer Services Officer (CSO) ... more details
In case of arrears of electricity dues from the defaulting disconnected consumers applying for reconnection and installments, a written undertaking will be obtained on a stamped paper of the required value to the effect that until the arrears are cleared in full, along with his current consumption charges, his premsis is liable to be disconnected forthwith due to nonpayment of any installment or current consumption bill. For reconnection apart from other formalities fresh security deposit is also to be paid, at the prevalent rates and you will have to execute fresh agreement as a condition precedent to obtaining reconnection. Supply to the premsis will be restored only on the payment of first installment and completion of all other necessary formalities.

If your meter is declared defective, you would be receiving an assessed bill based on your consumption during the corresponding months of last year, that is estimated bill due to defective meter at your premises, which should be replaced immediately. It is the policy of the company, on observing a defect in the meter, a 'Check Meter' is installed immediately, so that accurate electricity consumption is measured and correctly charged. However due to certain unavoidable circumstances, if Check Meter is not installed you would be receiving estimated bills marked 'def est'. It is further added that on the same bill age of defective estimated bills is also recorded and if your meter is not replaced within 2 to 3 months you should contact your subdivision.