Understanding utility bills: Electricity, gas & MPRN

A man scratching his head looking at three piles of documents

While some elements of your utility bill are fairly clear, such as contact numbers, others can be really confusing if you don’t understand all the terminology. Your electricity bill and gas bill contain valuable information and you should always check the details carefully. Key points to keep an eye on are meter readings, price plan, balance brought forward, and pay by date.

You can also compare the unit usage with previous bills to help make sure you aren’t wasting any energy. For further information on how to reduce your household bills, check out our guide on 101 ways to save money on your energy bills.

At Selectra we’ve analysed different supplier invoices for you, to make understanding your consumption and energy bills easier. Below we explain what items you can expect to find on your bill, and give a brief explanation of each.


Electricity bill

Bill Item Explanation
Account number This is the number for your personal account with your supplier and you should have it to hand when you need to contact them regarding any issues.
Supply address The address for the property where the electricity being billed is being used.
Billing address The address for billing purposes (may be different to supply address in the case of landlords for example).
MPRN Meter Point Reference Number indicates the point at which your house is connected to the electricity network. As such, if you move home this will change.
DG This indicates your Distribution Use of System (DUoS) profile, a charge that your supplier pays to the distribution network (ESB) on your behalf. DG1 indicates you have been assigned an urban domestic profile, and DG2 a rural one.
MC/MCC Stands for your Meter Configuration Code which indicates which type of meter you have.
Date of issue This is the date that the bill was issued on, not the date of receipt or the billing period.
Invoice number If there are any issues with a particular bill you’ll need to quote this number when discussing it with your supplier.
Billing period Usually 30 or 60 days.
Reading Type A, C or E. A means it was read by ESB, C means that the customer gave the meter reading, and E means it is an estimated reading based on details about your home and national usage statistics.
Payments This is a summary of all the payments you made previously.
Balance brought forward Credit or debit from the previous bill.
Charges for this period This contains a breakdown of your billing charges.
Pay by The date the bill is due. Normally payment is due within 14 days but for accounts in debit it’s normally due immediately.
Remittance advice/Giro slip To facilitate payment when the bills are not settled by direct debit.
Price plan The name of the plan you are on.
Meter readings The reading the current bill is based on and the previous bill’s reading.
Unit usage How many units of electricity you have used up. Energy units are measured in kilowatt-hours (kWh).
Unit price The rate your units are charged at. Unit usage multiplied by unit price will give you the total amount for your electricity usage before other charges are applied.
Standing charge A fixed charge you pay to your supplier consisting of distribution network charges and the cost of the supplier for your account.
PSO levy This is a fixed government levy set by the Commission for Regulation of Utilities which pays for researching and generating renewable energy.
VAT The Value Added Tax for energy in Ireland is set at 13.5%.
Carbon Emissions This tells you how many kilos of carbon were produced by your household within the billing period.
Fuel Mix Displays the sources your supplier uses in order to generate electricity.

Gas bill

Your gas bill contains a lot of similar information to your electricity bill, generally you can expect to find the following on it.

Bill Item Explanation
Account number Your unique identifier. Having this to hand will make calling customer support go more smoothly.
Supply address The address for the property at which the gas is being used.
Billing address If different to supply address.
GPRN Gas Point Reference Number indicates the point at which your house is connected to the gas network. As such, if you move home this will change.
AC Band Stands for Annual Consumption, and is represented by a letter indicating which estimated consumption bracket your household falls into. A less than 6500 kWh B 6000 kWh - 23,500 kWh C 23,000 kWh - 73,000 kWh Y 73,000 kWh - 750 MWh Z 750 MWh - 5,500 MWh
Meter number This is the number for the meter you currently have installed and will change if you get a new meter.
Date of issue This is the date that the gas bill was sent out.
Invoice number This is an identifier to be able to tell one bill from another.
Billing period This will shows the dates within which the unit rates were consumed that are being charged on the bill in question.
Reading Type This shows whether the reading was carried out by a professional (A), the customer (C), or whether it is an estimate (E) based on information about the home and historical usage data.
Payments This will show how the customer has agreed to pay the bills, and previos payments made.
Balance brought forward This will show whether your account is in credit or debit.
Charges for this period This details all the different charges that make up this specific bill.
Pay by The deadline that you need to pay by to avoid any penalties.
Remittance advice/Giro slip A section of the paper bill that lets you pay at the bank, or in some cases, at the post office.
Price plan The name of the price plan you are currently on with this supplier.
Meter readings The reading the current bill is based on, and the previous bill’s reading.
Unit usage The amount of gas units consumed. Gas units are measured by cubic metres (m3).
Conversion Factor The factor used to convert your units from m3 to kWh.
kWh The amount of gas kilowatts you are being billed for.
Rate Which unit rate you are being charged at (this is multiplied by the kWh to make up the total charge for energy consumed).
Standing Charge A charge your supplier adds to your bill to cover transmission and distribution charges. It is normally higher for rural customers.
VAT The Irish government has set VAT at 13.5% for gas.
Carbon Tax This is a tax applied to gas, oil, and solid fuels. It is 0.37 cent/kWh before VAT.
Carbon Emissions The quantity of carbon produced by the consumption of gas in your household.
Fuel Mix Where your supplier has sourced their gas from.

Issues with your bills

a pile of bills in yellow and blue

For any errors or issues with your bills, your first port of call is to contact your supplier and provide them with your account number and the invoice number. If they do not resolve your issue to your satisfaction or are taking an inordinate amount of time to do so, you may then file an official complaint with them. If you do so, don’t forget to get the complaint reference number before you get off the phone, as you will need it should you take the issue further.

If the issue still hasn’t been resolved within two months, you should then proceed to file a complaint with the CRU.


Why is my bill higher than usual?

A long bill with a man using a rope to try climb over it

Nobody likes opening their bill and getting a nasty shock when they see the bill they had budgeted for is much higher than expected. Consider the following issues before contacting your supplier if you think your bill is excessively high.

  1. Season - Heating your home is much more expensive in winter. Similarly, if the summer is unusually warm and you have the air-conditioning running, or fans on in every room, this can also contribute to a higher bill.
  2. Household Improvements - Have any renovations or extension-work been carried out at your home during the billing period? Firstly, the contractors and the electricity they needed for the work to be carried out, can increase your bill. Secondly, consider that windows or doors may have been left open while the heating was on, to increase drying time of materials. Lastly, if new electricity points and lights were installed, this will also cost you in terms of increased energy expenditure.
  3. Rate Increase - If you’re on a variable tariff, as the majority of people in Ireland are, it’s possible your tariff unit rate has gone up, or that there have been changes to government levies. It could also be that if you previously switched provider to avail of a discount, that your discounted period has ended and you have been rolled onto the standard unit rate with no discount. If the latter is the case, you can try renegotiate a new discounted contract with your provider, or switch to a cheaper offer.
  4. Additional People - If you’ve had visitors staying at your home or more people have been at home during the day due to illness or holidays, all those extra showers and increased hours of electricity and heating usage will add up.
  5. Moving Home - Have you recently moved home? Your new house may not be as energy efficient as your old one, or larger in size. In particular have a look at your home-heating and hot water elements (radiators, boiler, immersion…) to see what might be causing the increase. You can also check out our handy guide on the best way to heat your home.
  6. Estimated Bills - If you’re bill is very large and was estimated, it’s possible your usage was overestimated and you have been charged more than you should have been. Also if a previous bill was estimated, it may have been underestimated and your next bill will be bigger due to including any shortfall from the amount you previously paid. This is particularly true of gas bills, where six are issued each year and two are estimated. If you receive an estimated bill you should always submit a reading in order to keep your bill up to date and avoid any unpleasant surprises.
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