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Brennergy offer a large variaety of energy alternatives. For information on each of these please click on the tabs below.


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  • Renewable Heating Systems

  • Renewable Electricity Systems

  • Combined Heat
    & Power
Renewable Heating Systems

Space heating and water heating represents about 60% and 23% respectively of the energy requirements of a typical household. Thus it makes sense to focus on this in the first instance, if renewable energy is of interest. Whilst undertaking some simple steps to reduce the heating requirements through efficiency measures, more drastic steps may involve the installation of a renewable heat system. Three options, in the renewable heat field, are available:

Heat Pumps
These systems transfer heat from one source, such as ground sourced, water or air to another heat system.

Solar Water
A panel uses sunlight to pre-heat hot water in the hot water cylinder.

Wood Fuel
Wood, in the form of wood pellets, logs or wood chips, is burnt in a boiler which provides both space heating and hot water.

Element
Heat Pumps
Solar Water
Wood Fuel
CO2 Emissions
bullet Electricity Required for Compressors & Pumps
bullet None during Operation
bullet Carbon Neutral in Operation
Energy Availability
bullet Throughout the Year
bullet Should be Combined with Low Temperature Heating System
bullet Mostly in Summer
bullet Boiler Required for Heat Top-Up
bullet Throughout the Year
Maintenance
bullet Minimal Annual
Maintenance Required
bullet Service 3 – 5 Years
bullet Minimal Annual
Maintenance Required
bullet Service 3 – 5 Years
bullet Frequent & Annual Maintenance
bullet Flue Cleaning
Planning Issues
bullet Generally not Required
bullet Generally not Required
bullet Required for Chimney
Running Costs
bullet Electricity Required for Compressors & Pumps
bullet None
bullet Less Expensive than Oil, LPG & Electric
Space Issues
bullet Trenches & Boreholes Require some Space
bullet Heat Pumps are Larger than Boilers
bullet Hot Water Cylinder is Larger than Normal
bullet Larger Boiler Space Required
bullet Fuel is Bulky
Other Issues
bullet Installation can be Messy & Disruptive
bullet Good Insulated Property Required
bullet Roofs should face South
bullet Panels need to be Tilted
bullet Often Refuelling may be Required
bullet High Amount of Automation Possible

The Government is planning to pay producers of some renewable energy systems an annual payment equivalent to the amount of heat produced called the Renewable Heat Incentive. This legislation is expected to become effective in April 2011, although approved systems installed after July 2009 will be eligible.

Element
Heat Pumps
Solar Water
Wood Fuel
Payment
bullet Ground – Up to 7p per kWh produced
bullet Air – Up to 5.5p per kWh Produced
bullet Up to 18p per kWh Produced
bullet Up to 9p per kWh Produced
Timescale
bullet Ground – Up to 23 Years
bullet Air – Up to 20 Years
bullet 20 Years
bullet 15 Years
Renewable Electricity Systems

Electricity represents about 14% of the total energy requirements of a typical household. Whilst measures can be introduced to reduce electrical consumption individually, electrical consumption is increasing year on year on account of additional appliances in each household, which may prompt the installation of a renewable electricity system. Three options, in the renewable electricity field, are available:

Hydro
Running water is passed through turbine which in turn generates electricity

Photovoltaics
This technology converts sunlight into electricity via a panel.

Wind Turbines
These systems harness the power of the wind to generate electricity.
Element
Hydro
Photovoltaics
Wind Turbines
CO2 Emissions
bullet None During Operation
bullet None during Operation
bullet None during Operation
Energy Availability
bullet Fluctuation throughout the Year
bullet More Generation in Rainy Season
bullet Mostly in Summer
bullet Fluctuation throughout Day & Night
bullet Throughout the Year, but More in Winter
bullet No Generation in High Winds
Maintenance
bullet Annual Maintenance Required
bullet Minimal Annual
Maintenance Required
bullet Planning Required
bullet Consult Neighbours
Planning Issues
bullet Planning Required
bullet Generally not Required
bullet Planning Required
Running Costs
bullet None
bullet None
bullet None
Space Issues
bullet None
bullet Large, Unshaded Space Required with Southerly Aspect
bullet Large Distance Required between Turbine & any Obstruction
Other Issues
bullet Water Flow Speed & Head Height Determines Production
bullet Environment Agency Approval Required
bullet If Roof Mounted, ensure Roof Structure is Strong Enough
bullet Wind Speed at Site Determines Production

The Government is paying producers of some renewable energy systems an annual payment equivalent to the amount of electricity produced. It is called the Feed In Tariff and the payments are as follows:

Element
Hydro
Photovoltaics
Wind Turbines
Payment
bullet Up to 19.9p per kWh produced
bullet New Build – Up to 36.1p per kWh produced
bullet Retrofit – Up to 41.3p per kWh Produced
bullet Up to 34.5p per kWh Produced
Timescale
bullet 20 Years
bullet 25 Years
bullet 20 Years
Combined Heat and Power

In the combustion of fuel to generate electricity, heat is produced as a by-product. In a combined heat and power system, both electricity and heat is utilised and as the latter cannot be stored, the location of this type of plant must be in the vicinity of the heat user(s). As a result, the constraining factor in Combined Heat & Power systems is the utilisation of the heat produced not the electricity output.

Two options are available in the field:

Anaerobic Digestion
By using bacteria in the absence of air, organic material is broken down into fertiliser and biogas. The latter is burnt to produce electricity and heat.

Biomass
Wood or other plant based material is burnt to produce electricity and heat.
Element
Anaerobic Digestion
Biomass
CO2 Emissions
bullet None During Operation
bullet Carbon Neutral in Operation
Energy Availability
bullet Throughout the Year
bullet Throughout the Year
Maintenance
bullet Annual Maintenance Required
bullet Frequent & Annual Maintenance
bullet Flue Cleaning
Planning Issues
bullet Planning Required
bullet Required for Chimney
Running Costs
bullet High
bullet High
Space Issues
bullet Suitable for Farms, Food Processing & Retail Industries
bullet Large Space Required
bullet Larger Space Required
bullet Fuel is Bulky
Other Issues
bullet Possibly Need to Take In other Organic Matter
bullet Possible Sale of Biogas to the Grid
bullet Frequent Refuelling is Required

Combined Heat and Power systems are able to claim both heat and electricity renewable payments.

Element
Anaerobic Digestion
Biomass
Payment
bullet Heat – Up to 5.5p per kWh produced
bullet Electrical – Up to 11.5p per kWh Produced
bullet Biogas – Up to 4p per kWh produced
bullet Heat – Up to 3p per kWh produced
bullet Electricity – Up to 9p per kWh Produced
Timescale
bullet Heat – Up to 10 Years
bullet Electrical – Up to 20 Years
bullet Biogas – Up to 15 Years
bullet 15 Years
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burning fuel

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geothermal installation

biomass storage