Besides the photovoltaic panels, which were already described enough, there are the second major components of photovoltaic plants - inverters. The main parameter for each inverter in terms of energy use is its efficiency. It means how much power from a DC input AC output gets.

In the past there has been several large blackouts in the world. Risk of such blackout reportedly increases with increasing of share of renewable energy sources in energy mix. In fact neither of previous blackouts were caused by renewables. Main primary causes are age of transmission system components or operator error. Frightening with several days outage caused by renewable sources is exaggerated.

Especially in terms of energy savings and safety must enforce closed appliances category C. It must not, however, commit inappropriate application of new regulations such as Government Regulation No. 91/2010 terms of fire safety during the operation of chimneys, flues and heating appliances.

Sewage water contains organic compounds, thermal and kinetic energy, the amount is about 9 times higher than is needed for cleaning. The biggest source of heat energy are beyond the wastewater treatment plants, hotels, schools, restaurants, hostels, administrative buildings and other public facilities. Also, a wellness center, swimming pools, spas, and hospitals.

Comparison of price developments in eight EU countries shows very interesting facts. Eg. for common Czech household with consumption 2.5-5 MWh / year electricity price increased in 2011 to 229% of the price in 2001. While the same household in Germany to only 115%. While the current price is very close (CR 3.07, Germany 3.50 CZK / kWh).

Article comments on the climate conference in Durban and generally evaluates negative results so far made climate conferences. Sad is that, the last climate conference in Doha ended with the same result - with no progress in reducing greenhouse gas emissions.

The unfavorable trend in the development of carbon monoxide poisoning in the operation of gas appliances category B hasn’t, despite increasing technical performance of these appliances, downward trend. What is the responsibility of manufacturers, operators, assembly and service companies, engineering inspectors and citizens - users in the operation of gas appliances in case of poisoning?

The article presents an extensive and detailed analytical study that explores in detail the possibility of directing the development of the European energy industry in order to achieve a significant reduction in greenhouse gas emissions and a significant decarbonisation of the energy sector. Roadmap is not to be predictions or plan for further development, its goals are more modest, to lend a hand in finding their own paths to member countries to a sustainable, economically viable and environmentally acceptable energy economy.

The unfavorable trend in the development of carbon monoxide poisoning in the operation of gas appliances category B hasn’t, despite increasing technical performance of these appliances, downward trend. What is the responsibility of manufacturers, operators, assembly and service companies, engineering inspectors and citizens - users in the operation of gas appliances in case of poisoning?

Directive 2010/31/EU of the European Parliament and of the Council on the energy performance of buildings requires that new buildings since 2018 (public buildings) and 2020 (all buildings) respectively were buildings with nearly net zero energy buildings. The requirement relates to the all technical systems of the buildings. The paper presents possible solutions in ventilation and air conditioning field in these buildings and presents considerations about possible developments with regard to the requirement of reducing energy consumption.

The article presents an extensive and detailed analytical study that explores in detail the possibility of directing the development of the European energy industry in order to achieve a significant reduction in greenhouse gas emissions and a significant decarbonisation of the energy sector. Roadmap is not to be predictions or plan for further development, its goals are more modest, to lend a hand in finding their own paths to member countries to a sustainable, economically viable and environmentally acceptable energy economy.

The article presents an extensive and detailed analytical study that explores in detail the possibility of directing the development of the European energy industry in order to achieve a significant reduction in greenhouse gas emissions and a significant decarbonisation of the energy sector. Roadmap is not to be predictions or plan for further development, its goals are more modest, to lend a hand in finding their own paths to member countries to a sustainable, economically viable and environmentally acceptable energy economy.

Miners’ protest in front of the Office of Government at 31st October 2012 against deleting the "expropriation paragraphs" in the Mining Act and reaffirm the validity of the so-called "territorial ecological limits" in the North Bohemian lignite basin by the Czech Government turned attention of the public to context of surface mining of lignite.

It is generally recommended that the wood for quality burning should not have more than 20% by weight of so-called energy moisture. The described method allows a unique determination of moisture content of firewood at home.

So far, both the feed-in-tariff (FiT) and the green bonus (GB) was paid by locally relevant electricity distributor. From January 1^st 2013 the new entity enters into the transaction - OTE (Energy Market Operator). The renewable electricity will be purchased by electricity traders instead of distributors. Newly will be introduced a new scheme - hourly green bonus. The rights of existing manufacturers are fully retained.

The paper describes the management of district heating systems with circulating pumps with variable and controlled speed. It is shown that this control method is compared to systems with circulating pumps with fixed speed very advantageous, by substantially reducing power consumption to drive the pumps.