Martin Wood, from RWE Npower Renewables, said the company was "extremely disappointed" with the decision.
The regulator said that Npower's breach of the rules was "at the lower end of seriousness".
The Npower spokeswoman said it was "a small fire" and no evacuation was necessary.
The Earth Trust manages the site, a former gravel quarry, on behalf of electricity company Npower.
Npower chief executive Volker Beckers told the BBC the impact on domestic fuel bills was unclear.
Rival suppliers Scottish Power, SSE and Npower are still being investigated for potential mis-selling.
But Ofcom also conducted an investigation into calls made by Npower between 1 February and 21 March.
Their destination is Bradwell on the Essex coast, where RWE Npower renewables are building a 10-turbine wind farm.
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The Npower League Two club said the alleged incident involved Dagenham defender Gavin Hoyte and an unnamed Rochdale player.
Npower will increase the price of gas by an average of 8.8% and electricity by 9.1% from 26 November.
Meanwhile, Npower will increase the price of gas by an average of 8.8% and electricity by 9.1% from 26 November.
Marine Current Turbines (MCT) and RWE npower Renewables are behind the scheme off Holyhead, between the Skerries and Carmel Head.
The other half of the draw has relegation threatened Wigan playing either Blackburn or Millwall of the nPower Championship (another replay).
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There is speculation three firms are interested in Horizon as bids are submitted to owners, energy companies RWE npower and E.
Developer RWE Npower Renewables said it was working to allay such concerns.
Mr Hanlon said he was "particularly concerned" that complaints against one company - npower - had continued to rise despite warnings from energywatch.
Plans for the energy scheme were first put forward four years ago by Marine Current Turbines (MCT) and the power company RWE nPower.
As well as promising to take action against the "big six" energy companies - British Gas, Scottish Power, Scottish and Southern, Npower, E.
Ofgem initially launched a formal investigation in September 2010 into the sales techniques of four firms - Scottish Power, SSE, Npower and EDF.
Developer RWE Npower expects the project to have the capacity to generate up to 84 megawatts, enough to power the equivalent of 39, 700 homes.
Simon Wells from npower agreed that the lack of skills and the lack of specialists within local authorities were preventing planning applications from being processed.
Representatives from Scottish and Southern Energy and npower also believed that this could affect the Welsh economy and jeopardise the Welsh Government's renewable electricity targets.
Campaigners had fought moves to use the lake for dumping waste ash from Didcot power station until owners Npower found an alternative use for the ash in 2008.
On, EDF Energy, Scottish and Southern, Scottish Power and Npower.
Last week Npower and British Gas both announced that they were increasing gas and electricity prices in the UK, blaming the government's policies as well as wholesale prices.
"There is never a good time to increase energy bills, particularly when so many people are working hard to make ends meet, " Npower's chief commercial officer Paul Massara said.
In recent days, Cockenzie in East Lothian was switched off by owner Scottish Power, and RWE npower followed up by closing Didcot A in Oxfordshire, which had 2000 megawatt capacity.
For example, a device called the nPower PEG, introduced last year, can be stuck in a backpack or briefcase where it generates emergency power from the motion of the body.
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While most of the soccer world was transfixed by the spectacle of the Champions League final on Saturday, fans of English soccer started their day with the final round of the nPower Championship playoffs.
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