Energy Acronyms

From Energy-Experts

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Contents 1 Common Energy and Water Acronyms 2 A 3 B 4 C 5 D 6 I 7 L 8 M 9 V 10 W 11 Y

Common Energy and Water Acronyms

E Electrical

G Gas

O Petroleum

Env Environmental

P Plant

W Water

Eng Engineering

F Financial

WJ Wessex Jargon

3D’s Eng Definition, Design and Development

5C’s Eng Cam,Crank,Cyl Head,Cyl Block,Conrod

5Y’s Eng Why,Why,Why,Why,Why

A

E Ampere - unit for measuring electrical current

AADD W Annual Average Daily Demand

ADD W Average Daily Demand

ADPW W Average day demand peak week.

A-Team

The A-Team. In 1972 a crack commando unit was sent to prison by a military court for a crime they didn't commit. These men promptly escaped from a maximum security stockade to the Los Angeles underground. Today still wanted by the government, they survive as soldiers of fortune. If you have a problem. If no one else can help, and if you can find them, maybe you can hire: THE A-TEAM. Cf. E-Team {101}

Accrual F An amount which hasn't yet been paid or we haven't yet been billed for to date, but which is an estimate of what we know we are going to be billed for.

Aggresso F The Wessex Water Management Reporting and Finance system.

ALTENER

Alternative Energy Programme of the European Commission

AMP W Asset Management Plan

AOD W Above ordnance datum

Availability E linked to site maximum demand and measured in kVA. It has been likened to a reservation of space for maximum demand requirements in the REC’s distribution network. Also

Availability P Measure of usage and reliability of plant. If a CHP plant is operable for 7884 hours per year, and the total number of hours in a year is 8760, then it has an annual availability of 7884/8760 = 90%. Ideally should be 100% but never achievable.

Availability Charges E levied monthly typically in £ per kVA. It should not normally be expected for a site to have an availability in excess of ten per cent of its maximum demand.

Average Load (demand) E is obtained by taking: Annual site consumption (usually kWh) / 8760 (No. of hours pa.). If the consumption data is in kWh then the average load will be in kW. This is a useful tool when analysing data from a quarterly site or when checking against MD data.

AYTD expenditure Actual year to date expenditure. (Will include what's been paid, accrual 9.)

B

Balancing Mechanism E system used by NGC and generators to balance their supply and demand. The system provides the cash out prices.

Base Load E continuously produced or used electricity all year round.

BAT

Best Available Technology, ( as opposed to BATNEEC)

BATNEEC E Best Available Technology Not Entailing excessive Cost ( as opposed to Best Available Technology) See also Catnip.

BGL W Below ground level

BMS Eng Building Management System

BOD W Biological, or biochemical oxygen demand

BRE E Building Research Establishment Ltd

BRECSU Env Building Research Energy Conservation Support Unit

BST W British Summer Time

BSUoS E BS (?) Use of System

BTU Eng British Thermal Units.

Budget F An estimate of what is going to be spent in a given time frame.

C

CAD Eng Computer Aided Design

CAE Eng Computer Aided Engineering

Calorific Value (CV) G, O the amount of energy produced by the combustion of a specified quantity of fuel. It is typically expressed in Joules per kilogram or cubic metre.

CAM Eng Computer Aided Manufacture

CAPEX W Capital Expenditure

CAR

Californian Air Research

Cash Out Prices. F

CATNIP Eng Cheapest Available Technology Not Involving Prosecution

CCL Env Climate change levy. A tax on burning fossil fuels.

CCTV

Closed Circuit Television

CDM Eng Construction Design Management

CH Env Community Heating

COD W Chemical Oxygen Demand

CHP Eng Combined Heat And Power

CHPA Eng Combined Heat and Power Association

CHPQA Eng Combined Heat and Power Quality Assurance (scheme). To be eligible for tax breaks, the scheme must meet certain minimum standards.

Chunking E Management of profiles to account for standard meter time periods at individual smaller sites for trading in the fully open power market.

CIBSE

Chartered Institute of Building Services Engineers

Climate Change Levy E, G tax on the business use of energy implemented April 2001. The levy will be on gas, electricity, coal and LPG but not oil. Rates can be changed periodically by the government.

CM WJ Capital Maintenance

CMP WJ Capital Maintenance Programme

CNG G Compressed Natural Gas

CO

Carbon Monoxide

CO2

Carbon Dioxide

Code 3 E half hourly metering standard for the 1 MW to 10 MW market also usable for 100 kW to 1 MW sites.

Code 5 E half-hourly metering standard for the 100 kW to 1 MW market.

Code 6 E half hourly metering standard for the under 100 kW market. Code 7 standard also intended for this market.

Combined Heat and Power (CHP) E, G, O On-site electrical generating and heat provision units which when well designed can offer significant efficiency and cost advantages. (Your car is a CHP unit)

Common Carriage W Scheme to allow new entrants to use an incumbents transportation network and, in some cases, treatment facilities.

Commitment F

Commitment outstanding F Where goods / services have not been delivered.

Competition Clauses G Clauses in multi-year supply contracts, which enable customers to test prices in the market at each anniversary.

Compliant Metering E Metering consistent with an over 100 kW site’s access to a supplier other than its local operator. See Code 3, Code 5 and Code 6.

Connection Agreements E Contracts agreeing terms for a customer’s use of the local REC’s distribution network. Required along with a supply contract before a customer can take supplies from the competitive market.

Continuous rating Eng The maximum unvarying permissible power output of an engine i.e. that which can be delivered for 8760 hours per year.

Contracts for Differences (CFD) E Risk management contracts where generators and suppliers compensate each other when pool prices differ from an agreed strike price. Similar to swaps used in City trading and independent from the Pooling and Settlement System.

Copper losses E The same as I2R{128} losses

Correction Factor G Factor which adjusts gas volume through the meter to account for site atmospheric and

COSHH Env Control Of Substances Hazardous to Health

Crude Oil O Oil produced from underground reserves with any gas that may have been trapped in it removed, but before refining.

D

DA Data Aggregator

Data Aggregation E Merging of data from meters for wholesale billing. Now a competitive function on the PRS system, although one customers may wish to minimise their involvement with, as high importance function to supply industry.

Data Collection E Collection of data from electricity meters. Ultimately to be fully competitive, but presently restricted to half hourly meters on the PRS system.

DC E Data Collector

DEFRA Department of Environment, Food and Rural Affairs

Derv O An abbreviation for Diesel Engine Road Vehicle fuel, a middle distillate used for road transport. It has now been replaced by ULSD

Designated Market E Domestic and small business sites outside group ownership consuming less than 12,000 kWh per year. Prices for these customers must be published tariffs.

DG W Director General (of Water Services)

DO W Dissolved Oxygen

Distillate O Generic for lighter products, the most common being derv, gas oil and petrol.

Distribution E Monopoly local lower voltage wires businesses owned by the RECs.

DAM WJ Divisional Asset Manager

DM WJ Divisional Manager

DMAIC Eng Define, Measure, Analyse, Improve, Control

DUoS

Distribution Use of System

DWD W Drinking Water Directive

DWF W Dry Weather Flow

E&M WJ Electrical and Mechanical

EA Env Environment Agency. Body with responsibility for protecting the environment.

EB Env Environmental Body

ECA Env Energy Conservation Authority

EEC Env Energy Efficiency Commitment

Electricity only generation

Conventional power station producing only electricity, and wasting the heat by-product in cooling towers. An inefficient technology compared to CHP, characterising most of the UK’s generation plant.

EN590 O Technical title for EC driven diesel fuel of 0.05 per cent sulphur content.

Energy Rate E The negotiable element of power costs, which should be isolated when comparing quotes. Published distribution and transmission charges, settlement costs and the fossil fuel levy should be subtracted from total costs.

EQS W Environmental Quality Standard

ESCo

Energy Services Company

EST

Energy Saving Trust

Estimated Annual Consumption (EAC) E Measure of consumption stored on PRS for each MPAN number. Important for suppliers’ pricing.

E-Team

The Energy Team. A team within Wessex Water responsible for minimising the energy bill. Cf. A-Team {8}.

ETSU Env Energy Technology Support Unit – Govt office promoting Energy Efficiency Schemes

Export E Electricity passed from site to local rec.

EU

European Union

FFL Env Fossil Fuel Levy. Levy to pay for old style renewable support schemes. Replaced by ROCs schemes – Renewable Obligation Certificates.

FFT W Flow to Full Treatment

Firm Gas G a permanent year round contract gas supply.

Flash Point O the lowest temperature at which vapours from the oil will ignite momentarily when a flame is applied under specified conditions.

Forecast F A revised version of the budget.

Generated Electricity E Electricity produced by an on site generator

GCMS W Gas Chromatography / Mass Spectrometry

Generation Business E Division of an electricity supplier responsible for the production of power.

Generator running in Parallel E Generator synchronised with the mains and connected simultaneously with the main supply.

GHGs Env Greenhouse gases

GLC W Gas - Liquid Chromatography

GMT

Greenwich Mean Time

Grid (National grid) E Major electricity transmission network through the country.

Grid Supply Point (GSP) E the bulk feeder points from NGC’s transmission system, operating at 275kv to 400kV, into the regional electricity companies’ wires networks. Prices quoted on a GSP basis include energy rates and transmission losses only; distribution and transmission use of system charges, distribution losses, settlement charges and the fossil fuel levy need to be added to estimate delivered charges.

GRP W Glass-Reinforced Plastic

GSP E Grid Supply Point

GW E 1000 MW or 1,000,000 kW- gigaWatt

Half Hourly Metering -HH E over 100 kW customers seeking access to a second tier supplier must have this installed and a meter operator appointed. Two standards are in use, Code 3 for 1 MW to 10 MW customers and Code 5 for 100 kW to 1 MW customers. Codes 6 and 7 will apply in the fully open market. It is optional below the 100 kW level.

HH E half hourly metered. Sites which are measured consumption wise every half hour. By a special meter read by telemetry daily.

HECA Env Home Energy Conservation Act (1995)

HES Env Housing Energy Strategy

Host REC E The REC which is physically connected to a site in question.

HV E High Voltage (usually 3300V or above)

I

I2R losses E The losses in a circuit due to the resistance of the wires – being the product of the current2 and the resistance. Colloquially known as "the copper losses"

ICA W Instrumentation, Control & Automation

IEE E Institution of Electrical Engineers

Import E Electricity used by site from local REC {221}.

Import agreement

Inset Appointment W A method by which an alternate company may supply water services to a site in a restricted geographical location

Interconnectors E, G links into and out of the national delivery infrastructures. The most notable in electricity are those from France and Scotland into England and Wales and in gas the pipeline from Bacton in Norfolk to Zeebrugge, Belgium, opened in autumn 1998.

Interruptible Gas G lower priced gas available to larger customers (demands more than 200,000 therms) prepared to have their supply cut for periods at short notice. See also firm gas

IPPC (Integrated Pollution Prevention and Control):

wide-ranging new Regulations applying to certain types/ sizes of installation where an EA permit is required to operate the process, e.g. power generation, incineration, pyrolysis, gasification. Pollution and emission control measures will be assessed by EA against BAT (Best Available Technology), not BATNEEC

Iron losses E Losses caused to circulating currents in the ironwork of transformers.

IRR Eng Internal Rate of Return

Islanded or Island operation or islanding E Operating a generator to supply a load or site, when the site is disconnected from or in isolation from the national grid that is normally fed from the national grid.

ISO

International Organization for Standardization

Kilovoltampere reactive hours (kVArh) E units of measurement of reactive power.

Kilovoltamperes (kVA) E units of measurement for availability and, in some cases, maximum demand. Essentially the kVA rating defines the size of the wires, transformers etc.

Kilowatthours (kWh) E, G, O measurement of energy consumed, sometimes referred to as units. (Typically on your home bill)

kilowatts (kW) E measurement of maximum demand

KV E kiloVolt (1000V)

KVA E Kilo Volt-Ampere (V x A / 1000)

KVAr E Kilo Volt Ampere Reactive

KW E a kilowatt is a rate ( and thus similar to miles per hour, litres per second, horsepower, manpower, apples per second) of using or delivering energy as opposed to a quantity or amount (similar to miles, litres, horsepower hours, man-hours, apples). Expressed as a rate a kilowatt is actually 1000 joules per second so there are 3.6 MJ per kWh. Thus a 100 kW generator will deliver 100kW continuously. It will also deliver 100kWh (kilo-watt hours) in one hour, 200 kWh in 2 hours etc. It is wrong to say "it delivers 100 kWs every hour", and also wrong to say "it delivers 100 kW per hour" It will simply deliver power at the rate of 100kW whether you are considering it for a second, an hour, or a week. (Don’t worry lots of people get this wrong!)

KWA E Kilowatt Average

kWh E A kWh (kilo-watt hour) is the unit for measuring a quantity or amount of energy (as opposed to a rate of using energy), and in particular metering electrical energy - it is an amount of energy equal to 3.6 x 10^6 J. or 3.6MJ

kWhe E Kilowatt Hours electrical

kWhth Eng Kilowatt Hours thermal

Kyoto Protocol Eng agreed in Japan in 1997, it committed participants to reducing emissions of six major GHGs: CO2, methane, nitrous oxide, hydroflurocarbons, perfluorocarbons and sulphur hexaflouoride.

L

Lead Operator WJ

LM Eng Load Management

LM - Load Management E Where customers reduce consumption at expected peak times (typically TRIADS) or during expensive unit periods, to reduce costs either by shedding load or self generating.

LO

Landfill Operator

Load Factor

is the ratio of average electricity load (demand) compared against the maximum electricity demand

Load Factor E measures the relationship between consumption and maximum demand and thus the pattern of a site’s power consumption. Its formula is:

Load Factor G the relationship between daily average and maximum consumption. The higher this ratio is, the more predictable is consumption and the more attractive the site is to potential suppliers. The formula is:

Load Profile E, G in the electricity market smaller sites will have the half hourly data necessary for Settlement estimated from one of eight profiles. A similar structure has been devised to estimate daily consumption for smaller gas sites.

Load Shedding E Turning of loads to limit maximum demand, typically during Triad periods. A form of Load Management

LPG G Liquid Petroleum Gas

LV E Low Voltage (usually up to and including 400V / 415V)

M

Maximum Demand E is the maximum power supplied to a customer. In the electricity industry this is normally measured during a half-hour period in either kW or kVA.

Maximum Demand E the highest instantaneous demand recorded at a site.

Maximum Demand Tariffs E charge for maximum demand in winter months, typically November to February, reflecting higher costs of providing power then. Ie Triad avoidance.

MD E Maximum Demand – The peak rate of using power ever recorded in one year at a site – kW.

MLSS W Mixed Liquor Suspended Solids

MTBF Eng Mean Time Between Failure

Meter Operator E, G A company e.g. Siemens nominated by the customer to install, where necessary, maintain and operate metering equipment for the competitive market.

Metering Inside Settlement Timescales (MIST) E half hourly data collection from sites dialled up daily for Settlement.

Metering Outside Settlement Timescales (MOST) E half hourly data from sites collected sporadically and not used in the daily Settlement process. Option appropriate for under 100 kW sites only.

Metering Point Administration Number (MPAN) E a unique site reference number for accessing the appropriate PRS in the fully open power market. Intended to have common code identifiers running to more than 20 digits. Customers will require all relevant MPANs to change supplier. Also referred to as the Supply Number.

Metering System Identification Number (MSID) E unique identifying code number allocated to sites in the over 100 kW sector enabling them to be quickly identified and verified.

Middle Distillate O products obtained between the kerosene and lubricating oil fractions in the refining process including gas oil and derv. It is the fraction boiling between 165 and 370 degrees centigrade.

Mld Ml/d Ml/day W Megalitres per day. Megalitre - one million litres (

Mogden Formula W The method by which trade effluent prices are calculated

Monthly sites E those whose meters are read on a monthly basis. Always sub 100kW.

MOP E Meter Operator

MPAN E Meter Point Administration Number

MTLA

Modified Three Letter Acronym. See TLA

MW E 1,000,000 W = 1000 kW = megawatt

MWe E Megawatts electrical

MWth Eng Megawatts thermal

National Grid Company (NGC) E Operator of the bulk transmission network in England and Wales.

NDT Eng Non Destructive Testing

NETA E The New Electricity Trading Arrangements. The wholesale trading system that replaced the Pool.

Neutral Point E Consider the three phases (wires) visible coming from a power station on the transmission towers. If you were to connect three large coils to each phase (be careful, don’t try this at home) and connect the three spare ends together, this would not create a bang as you might suppose but a neutral or star point.

NHER Eng National Home Energy Rating

Non Daily Metered(NDM) G Covers all sites where metering is not daily.

OEM Eng Original Equipment Manufacturer

OFWAT W Office of Water Services

OFGEM E, G Office of Gas and Electricity Markets. The body created in 1999 to supersede OFFER and OFGAS in regulating the electricity and gas industries.

ONCC W OFWAT National Customer Council. The national forum for CSC Chairman

Operator WJ

OPEX W Operating expenditure

OTTNO

"Oh, that, that’s never worked (operated). Refers to the psychological habituation that results if a piece of equipment has ot been commissioned and installed correctly within weeks of intended commissioning, and its handing over to Ops with a snagging list. Inevitable outcome is that Ops will lose faith, and never get the equipment working.

PAH(s) W Polycyclic Aromatic Hydrocarbon(s)

PAM/SPC

Process Area Monitoring / Statistical Process Control.

PAM is where a complex process such as an STW is broken down into various discreet process areas (lift pumping. Aeration, re-circulation) and the energy consumed is measured for each process area.

Parallel Agreement

Pass Through E, G term referring to provision for use of system charges and taxes to be incorporated in contract prices at published rates with no supplier mark up; ‘passed through’.

PES E Public Electricity Supplier

p.e. or PE W Population Equivalent

PF E Power Factor = KW / KVA

Ponding W Choking of the interstices of the medium in a biological filter to the extent that pools of applied liquid appear on the surface.

Power Factor E the ratio of kW and kVA. Significance: In a purely resistive load such as an electrical heater, the power consumed is measured in Watts and is given by the product of the Voltage and the Current (Amps) in the circuit. If a generator feeds the heater, then the engine's mechanical power will be exactly equal to the Volt x Amperes (VA) divided of course by the alternator efficiency.

However in an inductive load such as a pump motor, the power consumed is the produce of Volts and Amps times the Power Factor, and this is again the power delivered by the engine, again allowing for generator efficiency.

Prime Power or Prime Rating Eng The maximum permissible output specified of an engine or genset, when the generator is supplying a varying load, for an indefinite duration. Typically when the genset is the prime power source on loads such as a construction camp, a building site, or a permanently islanded works.

PRS – Public Registration System E Settlements System (for electricity gen & supply)

PRV W Pressure Reducing Valve in fixed head form i.e. outlet pressure always at a specific value regardless of down stream conditions, or flow modulated at the valve site.

PSV W Pressure Sustaining Valve which will maintain the upstream pressure of the valve at a fixed value regardless of the flow or downstream condition.

Public Electricity Supplier (PES) E term for the 14 regional electricity suppliers of Great Britain with public service obligations in the tariff sector. They include the English and Welsh RECs,

Public Electricity Supplier Registration System (PRS) E Database for managing competition in the competitive market, operated regionally by the public electricity suppliers. Will replace ERS and supports competition in data

PVC W Polyvinylchloride

Quarterly sites E those meters are read on a quarterly basis. Always non half hourly.

Ratings (generators) Eng Terms published by engine and generator manufacturers and used to define the permissible maximum power output which the engine can be set at, under specified operating conditions.

The idea is to limit abuse of the engine, since running a generator at the wrong rating, will rapidly damage it. See also: Standby rating, Prime Power or Prime Rating, and Continuous rating.

RBC W Rotating Biological Contactor

RCOM Eng Reliability Centred Operation and Maintenance

Reactive Power ‘wattless current’ E some alternating current is not measured by kWh meters, but the supplier must still provide it. A limited amount is assumed to be used but customers are charged for any excess. Being charged is a penalty for having a poor power factor. Typically ‘wattless current’ users include motors and computers.

REC E Regional Electricity Company

Regional Electricity Company (REC) E the twelve privatised successors of the area boards with regional distribution and until 1998 tariff monopolies. For example – SWEB, Scottish and Southern, Western Power Distribution.

Renewable Obligation E A requirement placed on suppliers to provide a proportion of their supplies from capacity generated from renewable sources. Administered using ROCs – Renewable Obligation Certificates.

Reserve Service. E A service provided to the National Grid by generators such as Wessex Water. Typically they must be able to be started within 20 minutes max. Wessex receive a payment of around £xk per MW per year.

ROCs E Certificates obtainable from a participating REC, which can be sold, thereby providing a subsidy for specified "green power" generators.

ROE Eng Return On Equity

ROI F Return On Investment

Rotterdam Related Pricing O Pricing to customers based on changes in average Rotterdam spot market prices converted to sterling. For example, a contract may be priced from one month at the average Platts spot price for the previous month converted to sterling with a supplier margin added.

Rotterdam Spot Market O the major import point for oil into North Western Europe whose trade prices have become accepted industry markers. Variable and very influenced by sentiment.

RTFM

Read The Flaming Manual

SAE Eng Society of Automobile Engineers

SAP

Standard Assessment Procedure

SDMO Eng Societe De Moteurs de l'Ouest

Seasonal Time of Day (STOD) Tariffs E tariffs available to larger customers charging penal unit rates at times of expected system peak demand (Triads). Supply contract offers can be similarly structured to encourage customers to switch demand to other times.

Second Tier Supply E Supply provided by a Supplier other than the Host REC (i.e. supplied from outside the REC area)

Second Tier Supply Licences E must be held by all suppliers wishing to supply in the competitive market including RECs wishing to win business outside their areas.

Settlement E the daily process of balancing wholesale trades in the

Settlement Charge E charge levied for collecting and handling a site’s

Settlement System Administrator (SSA) E operator of the wholesale electricity pool, collating bid data and determining prices. Role currently undertaken by Energy Settlements

Settlement System, - "Settlements"

Single phase E Power supply consisting of a connection from any one of the three phases of a 3 phase supply and the neutral point or star point, or between any two phases. Suitable only for small power outputs – up to say 3 kW as in a house or small office.

Sizing of generators. Eng To size a generator, simplistically one decides which rating applies. A load list is compiled and summed to give the maximum load. A generator with the appropriate rating just exceeding that value is then chosen.

However in practice, it is usually found that the size of the generator is determined by the voltage drop when starting the largest sized motor.

Sloughing W A phenomenon which occurs in a biological filter during the spring, when with the warmer weather the scouring organisms return to the surface layer of medium and feed on growths which have accumulated during the winter and may have caused ponding {207}. It may also occur at other times after ponding has been relieved. At such times a greatly increased amount of suspended matter is discharged from the filter with the effluent. Same as Spring unloading.

SMART Eng Specific, Measurable, Achievable, Realistic & Timely

SOP

Standards of Performance

SOP Eng Standard Operating Procedure

SPC Eng Statistical Process Control

Spill E the electricity exported from a site that is running in parallel and absorbed by the host REC. The difference between site load and amount of electricity being produced by the generator.

Spring unloading W Same as Sloughing {243}.

SPS

Sewage Pumping Station

SS W Suspended Solids

Standby and Top Up Charges E charge schedules offered by suppliers to support extra power requirements of on-site generators.

Standby rating Eng That load the manufacturer states the generator can be used at during emergency use only, i.e. an interruption to the main supply. This is for a maximum duration of typically 250 to 50 hour per year.

STOD E Seasonal Time of Day, types of electricity tariff.

STW W Sewage Treatment Works

Sub 100kW. E All sites other than HHs. These are divided into Monthly read sites and quarterly read sites.

Supply Agreement

Supply Business E the suppliers’ businesses responsible for buying in power from generators and selling it onto customers on tariff or contract terms. Profits from supplying the tariff market are monitored by OFGEM.

Supply Contract E Signed between a customer in the competitive market and supplier for the supply of electricity to qualifying sites over a given period. It should be accompanied by a connection agreement.

Supply Points E the number of supply points into a premise. More than one will not preclude a single premise from qualifying for the competitive market.

Supply Voltage E the voltage at which a site receives its power. The border between high and low voltage supplies is normally assessed at 1,000 volts. Important determinant of distribution charges.

SWL Eng Safe Working Load

SWOT

Strengths, Weaknesses, Opportunities & Threats,

System Buy Price (SBP) E a market price generated from bids to The System Operator to supply energy to balance the system

System Losses E energy which is generated for customers at the power station but does not reach their meters. Currently customers pay for this, in the competitive market as a per cent on-cost on the energy rate.

System Operator

System Sell Price (SSP) E a market generated price for bids to the System Operator to spill energy from the system.

== T ==

Take or Pay G clauses in suppliers’ contracts with field operators which entail their paying for gas even if they do not sell it.

Tariffs E Pre-published charge schedules available to all sites consuming below 10 MW from their REC.

TDS W Total Dissolved Solids

TDS W Total Dry Solids

Termination Notice E, G can be one month or three months typically. Check existing contract terms.

Therms G Consumption measurement unit. To convert from kWh prices to pence per therm multiply the former by 29.3071.

Three phase E Power supply consisting of at least a connection from three phases (wires) of a 3 phase supply and usually the neutral.. Suitable for larger power outputs – above 3 kW. See single phase.

THV W Throttled Valve. A normal sluice gate valve or specially designed valve where the outlet is reduced hence reducing flow by increased headloss across the valve.

TLA

Three Letter Acronym See MTLA

TNUoS E TS (?) Use of System

Transco G BG plc business unit responsible for operating the national pipeline network. As a monopoly its charges and operations are overseen by OFGEM.

Transmission E the 275 kV and 400 kV national network for bulk movements of power. Operated in England and Wales by the National Grid Company and in their regions by Scottish Power, Hydro-Electric and Northern Ireland Electricity.

Transmission Charges E A customer’s average kW demand at the triad peaks is multiplied by a £ per kW regional rate to charge for use of the transmission system in England and Wales.

Transmission Services Use of System E charges for the control and security aspects of maintaining the grid. These costs used to be priced as an element of pool selling price but have now been hived off as a separate charge administered by the National Grid.

Triad E those 3 periods of maximum electricity demand on the national grid system separated by at least 10 days. (These usually occur Monday to Thursday between 4.30 and 6.30, from Nov 1st to Feb 1st, and on particularly cold days during that period.

Triad charges E charges levied by the National Grid on RECs to reflect the cost of meeting the total demand capacity. These are typically £12,000 per MW per year for all 3 periods, and are reflected in RECs tariffs, so manipulating our MD by for example LM or Load Shedding, reflects directly into making these kind of savings.

Triad Peaks E the three times of system peak demand in a year against which transmission charges for England and Wales are calculated. They must occur more than ten days apart and typically fall on winter weekdays except Fridays between 16.00 and 19.00 hours.

TUoS E Transmission Use of System

TX E Transformer (abbreviation)

UNFCCC Env United Nations Framework Convention on Climate Change, agreed at the Earth Summit in 1992.

Unit Rates E charges for kWh consumption. Do not confuse with contract energy rates for as well as energy they can include other costs including distribution.

V

VOC

Volatile Organic Compounds

W

WTW

Water Treatment Works

WWTW

Waste Water Treatment Works

Y

YTD expenditure Year to date expenditure