Showing posts with label Grid Tie. Show all posts
Showing posts with label Grid Tie. Show all posts

Tuesday, 10 March 2009

Sell-Your-Own-Energy-Back-To-Your-Supplier-Renewable-Energy





Did you know you could be making money from the electricity generated by your renewable technology installation?

If you have installed, or are thinking about installing, a renewable technology which produces electricity, such as a Solar Electricity (PV) system, you may be able to get paid for the electricity it produces. The most common way to do this is to sign up to a buy back scheme with an energy supplier. There are two main tariffs available to do this:
Export tariffs: You are only paid for the electricity that is exported back to the electricity network (you are not paid for any electricity you use). Generation tariffs: You are paid for all of the electricity that your system has generated even if you use it in your own home. There are also some Set Price Tariffs available where a fixed amount is paid by the energy supplier based on the type or capacity of the installation.
Use our buy back tariff search tool
To help you find the right tariff more easily we have developed a buy back tariff search tool. Using this tool will allow you to see details of all the tariffs currently being offered by the energy suppliers.
Click here to go straight to the buy back tariff search tool
Before you start your search you may wish to read the guidance below.
Choosing the right tariff
The answers to the following questions should help you choose the right buy buy back tariff for your situation:
Do you expect to use most of the electricity you generate at home?
If the answer is yes, it is likely that a Generation Tariff is likely to be a better option for you as you will get paid for all the electricity you generate rather than just the electricity that is exported.
If you will be using a small amount of the electricity your system generates then an Export Tariff may be a better option for you.
Will you need to install a new meter?
Total Generation Meter: Most tariffs will require you to have an Ofgem approved Total Generation Meter which should be installed with your system. Total Generation Meters give a running total of the electricity generated by the system in kilowatt-hours (kWh). Export Meter: Most export tariffs require you to have an export meter installed. Some companies will pay for the meter and its installation whereas others may charge you. It is important that you establish the costs before agreeing a contract. Will it affect your import supply?
Most buy back tariffs are dependent on the customer getting their import supply from the same energy supplier, and some suppliers limit the choice of available import tariffs that can be used.
You should check tariffs are on offer from the supplier purchasing your electricity generation and how much your annual bill will be. You will want to take these costs into consideration alongside the export/generation tariff payment.
What else should you consider?
Renewable Obligation Certificates (ROCs) are certificates given to registered generators of renewable electricity produced and sold within the UK. You will be entitled to one certificate for each megawatt hour (or 1,000 kilowatt hours kWh) of electricity you produce.
Some tariffs include a price for ROCs whereby the energy supplier acts as the ROC agent, claiming ROCs from Ofgem on behalf of the customer. However, there are other tariffs where the customer retains the ROC entitlement and must claim these themselves. For ROCs to be able to be claimed you must have a Total Generation Meter installed. Information on which tariffs include a payment for ROCs can be viewed by looking at the tariff details on our buy back tariff search tool.
Some suppliers include the payment for ROCs within the tariff, this means the ROCs are claimed by the energy company on the customers' behalf. If the tariff does not include payment for ROCs then the customer can claim for them separately.

Sunday, 8 March 2009

Grid-Connected-System


Grid Connected System

The grid-connected system generates and delivers electricity to a homes Alternating Current (AC) system without using batteries. The Solar Array (PV) acts like a power generation plant, supplying electricity to the grid. This is becoming very popular in Spain, as the electricity distribution company will buy the electricity from you for 0.4 Eur/Kwh.

  • 1 - Grid connect inverter
  • 2 - Solar (PV) panel
  • 3 - Mains electricity supply

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Sunday, 11 February 2007

Googleplex-Goes-Solar



Google Enters the Energy Business

I read on the Google blog that they plan to begin installation of 1.6 megawatts of solar photovoltaic panels (PV panels) at their Head Office in Mountain View, California. They reckon it will be ‘the largest solar installation on any corporate campus in the U.S., and think it’s one of the largest on any corporate site in the world’. But something puzzled me – do they have enough room for all those panels?
Apparently ‘The panels will cover the roofs of the four main buildings of the Googleplex, and also those of two additional buildings across the street. There will also be a portion of this installation on new solar panel support structures in a few parking lots. The amount of electricity that will be generated is equivalent to powering about 2,000 UK or 1,000 average California homes. 'We’ll use that electricity to power several of our Mountain View office facilities, offsetting approximately 30% of our peak electricity consumption at those buildings.’

You can see how much roof space they have available in this photograph I came across (from Google Earth). So I looked into how much space you’d need to generate 1.6 megawatts from solar PV panels. According to one set of calculations I found on a mail order PV panel site ‘Solar Solar’, Google are going to need 919 PV modules generating 185 watts each. This will cover 13,250 square feet or one third of an acre. The campus covers 22 acres, so it would seem that giving up 1.36% of that space in roofing and parking isn’t such a big deal.
For you or I the cost of 919 PV panels would be anything from £0.5 million to £5 million. For some reason prices in the UK are at the higher end. Luckily for Google, the California Energy Commission has a very good rebate system for homes and businesses, particularly if Google use a ‘Grid tie’ system – putting electricity into the grid during the day when the sun’s out (so the meter goes backwards) and drawing it back at night on an off peak or reduced rate. So it seems Google may now technically be entering the energy market. Googlejuice! Googlegreen!
I dare say it won’t be too long before we can see something demonstrating how many greenhouse emissions have been saved by Google’s solar move - like this one at the Hydrogen Fuel Cell Institute.

Saturday, 13 January 2007

Proven-Grid-Tied-Downwind-Down-Wind-Turbine






I have just returned from a visit to a friend in Burnley (Lancashire) who has a 6KW grid tied Proven wind turbine! What an awesome site it was to see it working away in what I can only describe as gale force conditions that are hitting the UK right now!

I have decided to run my homebrew wind machine tonight in 24V mode and the power difference is scary. I was getting around 80W of power into my battery bank running the turbine at 12V but on 24V charging I am now sat here looking at in excess of 1KW! I guess letting the blades run away a little more makes a huge difference on the power output of the turbine!

Above are a couple of pictures from my visit this evening.