Description of AEMS (Automated Electricity
Metering System)
1. The following objects (clients) can be connected to
AEMS:



The electricity market participants:
 with permitted connected load 100 kW and higher,
 with permitted connected load less than 100 kW,
Associated users,
Independent producers of electricity
 as associated users;
 as market participants.
2. AEMS installation costs for each group of users:

The electricity market participants:
 For objects with simultaneously permitted connected load 100kW
and higher – meter replacement and connection to AEMS is a free
of charge service.
 For objects with simultaneously permitted connected load less than
100kW (it is possible in rear cases that the object’s total permitted
connected load is higher than 100 kW, and 2 direct connection
meters are installed):
 If a client agrees to an object’s hourly consumption metering in
accordance with the standard load schedule – free of charge
service,
 If a client would like to connect an object to AEMS, the user
pays for meter replacement, AEMS terminals and their installation
corresponding to the actual installation costs,
 Hourly consumption for non-metered objects is determined by
way of calculation – free of charge service,
 If a client would like to use one’s own automated data reading
system, the user sends the preceding day’s hourly load profile data,
journal of events and accounting data on each commercial metering
of electricity in defined file format to ST on a daily basis. Free of
charge service.
 Associated users, who have applied for the connection to AEMS in a
written form:
 For objects with simultaneously permitted connected load 100kW
and higher – meter replacement and connection to AEMS is a free
of charge service.
 For objects with simultaneously permitted connected load less than
100kW, the user pays for meter replacement, AEMS terminals and
their installation corresponding to the actual installation costs,
 The repeatedly connected independent producers of electricity are
obliged to connect the submitted/received commercial meterings of
electricity as well as the meterings of electricity produced by the generators
to AEMS. The independent producer pays for meter replacement, AEMS
terminals and their installation corresponding to the actual installation costs.
3. Data exchange process for each group of users (the most
typical cases):
1. The electricity market participants:
 For objects that are connected to AEMS and whose simultaneously
permitted connected load is 100kW and higher – the meter data are
exported to AEMS on a daily basis; after that, the data are exported
from AEMS to CSPS (Customer Service and Payment System).
DSO (ST) sends a bill for distribution system services to the user
once a month; at the same time, DSO forwards the load profile data
to the trader, who issues a bill for the electricity consumed.
 For objects with simultaneously permitted connected load less than
100kW:
 If payments are made following the standard load schedule –
the user reports the electricity meter showings once a month by
entering these showings into CSPS; next, the object’s monthly
electricity consumption is calculated, and, following that, CSPS data
are exported to AEMS and the electricity consumption is divided
into hourly schedule in correspondence with the object’s
classification. DSO (ST) sends a bill for distribution system services
to the user once a month; at the same time, DSO forwards the load
profile data to the trader, who issues a bill for the electricity
consumed.
 If an object is connected to AEMS, the meter data are exported to
AEMS on a daily basis; after that, the data are exported from AEMS
to CSPS (Customer Service and Payment System). DSO (ST) sends
a bill for distribution system services to the user once a month; at the
same time, DSO forwards the load profile data to the trader, who
issues a bill for the electricity consumed.
 For non-metered objects, the hourly consumption is determined
by means of calculation in accordance with the objects’
classification. DSO (ST) sends a bill for distribution system services
to the user once a month; at the same time, DSO forwards the load
profile data to the trader, who issues a bill for the electricity
consumed.
 If a client would like to use one’s own automated data reading
system, the user sends the preceding day’s hourly load profile data,
journal of events and accounting data on each commercial metering
of electricity in defined file format to ST on a daily basis. The data
submitted by the user will be processed and saved in the common
metering database. DSO (ST) sends a bill for distribution system
services to the user once a month; at the same time, DSO forwards
the load profile data to the trader, who issues a bill for the electricity
consumed.
2. The metering data of independent producers are exported to CSPS on a
daily basis, and:
 if a producer is an associated user, then:
1. DSO (ST) sends a bill for the consumed active and reactive
electricity in accordance with the tariff for associated users,
2. the public trader purchases electricity (balance)
 if a producer is the market participant, then:
1. DSO (ST) sends a bill for the total amount of electricity conducted
into the network,
2. the trader sends a bill for the electricity sold,
3. the public trader purchases the electricity conducted into the
system.
All the data exchange processes specified above are free of charge.
4. AEMS service types available to users:
In addition to automated reading of metering data and issuing of monthly bills,
ST offers four optional services for the clients to choose (ST order No. 466 “On
Automated Electricity Metering System (AEMS) access service” of
12.09.2008):
1. Once a month, data on the amount of electricity consumed in the
preceding month are sent to the client’s specified e-mail address. Free of
charge service.
2. Once a month, data on the amount of electricity consumed in the
preceding month and hourly load schedule are sent to the client’s
specified e-mail address. Free of charge service.
3. Information on the amount of electricity consumed in the preceding
day and the hourly load schedule are made available to clients over the
internet 24 h a day. Paid service – LVL 38.48 (including VAT)
(iClients).
4. Information on the amount of electricity consumed in the preceding
hour and the hourly load schedule are made available to clients over the
internet 24 h a day. Paid service – LVL 176.40 (including VAT)
(iClients).
See working instructions for iClients here: Working with the internet
program iClients
5. Classification of object, standard load schedule
Users report the meter showings for objects (objects of the open market
participants with permitted connected load up to 100kW). The monthly
electricity consumption is calculated after the data have been entered into CSPS.
This consumption in line with standard load schedule is divided into hourly
schedule, determining the amount of electricity consumed by hours. Such a
division is needed for correct calculation of payments for electricity supplied to
the users, for the price of electricity in the open market is determined at hourly
intervals; the price of electricity will be different at each subsequent hour.
A particular classification is assigned to an object depending on the purpose
of electricity consumption at the specific object (for example, “Greenhouse”,
“Office”, “Shop”).
A typical standard load schedule is worked out for each object classification
on the basis of historical data of the relevant objects. It means, for example, that
the hourly consumption of an individual house per 24 hours will differ from the
hourly consumption of a shop per 24 hours.
See below the comprehensive standard load schedule: Standard load
schedules for users
Individual house
WORKING
WEEKEND/
DAY
HOLYDAY
Hour
Hourly consumption %
Shopping centre
WORKING
WEEKEND/
DAY
HOLIDAY
Hour
Hourly consumption %
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
00:00
2.16%
1.98%
1.92%
2.00%
2.85%
5.22%
4.55%
3.94%
3.69%
3.34%
3.68%
3.74%
3.27%
3.33%
4.18%
5.66%
7.09%
6.95%
7.13%
7.14%
6.03%
4.36%
3.19%
2.59%
2.23%
2.06%
1.95%
2.17%
3.22%
3.68%
4.89%
4.68%
4.34%
4.52%
4.77%
4.21%
4.26%
4.20%
4.38%
5.71%
5.51%
5.79%
5.88%
6.21%
5.37%
4.24%
3.19%
2.54%
2.18%
2.09%
2.04%
2.05%
2.09%
2.74%
3.54%
4.20%
4.94%
5.55%
5.64%
5.64%
5.68%
5.71%
5.72%
5.75%
5.75%
5.68%
5.57%
5.26%
4.66%
2.97%
2.35%
2.20%
2.14%
2.06%
2.01%
2.02%
2.07%
2.70%
3.43%
4.01%
4.87%
5.55%
5.66%
5.69%
5.75%
5.76%
5.75%
5.75%
5.74%
5.67%
5.61%
5.30%
4.72%
3.06%
2.40%
2.26%
6. Balancing service
Every participant in the electricity market can use balancing service, which
means that:
 the market participant compiles the expected hourly electricity
consumption,
 the market participant comes to terms with the trader on the hourly price
of electricity,
 the market participant comes to terms with the trader that a separate
charge will be calculated for the consumed or unconsumed electricity,
 after the accounting period, the trader issues a bill to the user, reflecting
the price for the consumed electricity and balancing service – which
essentially means the price of the overconsumed or unconsumed
electricity.
The balancing electricity price is also determined by hours.
A user of electricity, informing the system operator, may delegate the trader
to settle accounts for the balancing service on behalf of the user. In this case,
a strict amount of hourly consumption of electricity is not determined for the
user, and the balancing charge is included in the price of electricity.
For example:
A user would like to do balancing by himself; hence, he compiles the
expected hourly consumption for the subsequent accounting period (the
example shows three hours of one day):
Plānotā un patērētā ikstundas elektroenerģija
14
12
MWh
10
8
6
4
2
0
06:00
07:00
08:00
Stunda
Plānotais patēriņš
Reālais patēriņš
/Electricity planned and consumed hourly
Hour
Planned consumption
Actual consumption/
The user comes to terms with the trader that the price of the planned
consumption of electricity (the pink column) will be:
1. at 6:00 – 300 LVL/MWh,
2. at 7:00 – 320 LVL/MWh,
3. at 8:00 – 340 LVL/MWh,
Average ~ 320 LVL/MWh.
In the case of consuming more electricity than planned, the price of
electricity will be:
1. at 6:00 – 320 LVL/MWh,
2. at 7:00 – 340 LVL/MWh,
3. at 8:00 – 360 LVL/MWh.
At the same time, if the planned amount of electricity is not
consumed, the trader will buy back the planned unconsumed electricity for
lower price:
1. at 6:00 – 150 LVL/MWh,
2. at 7:00 – 160 LVL/MWh,
3. at 8:00 – 170 LVL/MWh,
It follows from the example that:
1. at 6:00 – 1x300x10=LVL 3000,
2. at 7:00 – 1x340x12=LVL 4080,
3. at 8:00 – 1x340x10 – 1x2x170=LVL 3060,
Average ~ 338 LVL/MWh.
An analogous calculation can be made for each hour of a month.
Consequently, the client will pay LVL 10 140 for 30 MWh consumed, or the
average of 338 LVL/MWh. This example demonstrates that if the planned schedule
is not followed exactly, the price of electricity for the user increases for
38 LVL/MWh already within three hours.
Conversely, if the client chooses to include the balancing service in the price of
electricity, the average price of electricity will be higher; however, the user will not
need to follow scrupulously his hourly consumptions of electricity.
7. Mandatory procurement component
Paragraph 113 of the Cabinet Regulation No. 452 prescribes: “All end users
of electricity shall cover the expenses of the provision of mandatory procurement of
electricity produced by capacity, introduced according to the procedures for
mandatory procurement and the procedures for a tender proportionally to the
amount of the consumption of electricity thereof.”
It means that the regulator has established an obligation for the public trader
to purchase electricity from the producers who produce electricity by co-generation,
from the producers who produce electricity by using renewable energy sources,
from HPPs with capacity up to 5 MW, as well as from the producers whose
capacities are introduced according to the procedures for a tender, for a higher price
than it could be purchased from the wholesalers of electricity. The price difference
for electricity purchased under mandatory procurement is covered by ALL the users
of electricity irrespective of the tariff applied or the trader. For associated users, this
difference is already included in the electricity tariff as justified expenses. For the
market participants, this price of electricity is not included in the tariff; instead, it is
reflected in the bill as a separate position.
! The clients of other traders also pay the mandatory procurement component. In
this case, the “Mandatory Procurement Component” is included in the system
operator’s bill. The system operator, in turn, transfers this collected component to
the public trader.