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2. Cost of electricity by source - Wikipedia

   en.wikipedia.org/wiki/Cost_of_electricity_by_source

   The levelized cost of electricity (LCOE) is a metric that attempts to compare the costs of different methods of electricity generation consistently. Though LCOE is often presented as the minimum constant price at which electricity must be sold to break even over the lifetime of the project, such a cost analysis requires assumptions about the value of various non-financial costs (environmental ...

3. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   80–89% for oil-fired and; 45–60% for coal-fired heating. [26] Oil storage tanks, especially underground storage tanks, can also impact the environment. Even if a building's heating system was converted from oil long ago, oil may still be impacting the environment by contaminating soil and groundwater.

4. Electricity pricing - Wikipedia

   en.wikipedia.org/wiki/Electricity_pricing

   [15] [16] In the United States, 70% of current coal-fired power plants run at a higher cost than new renewable energy technologies (excluding hydro) and by 2030 all of them will be uneconomic. [17] In the rest of the world 42% of coal-fired power plants were operating at a loss in 2019.

5. Life-cycle greenhouse gas emissions of energy sources

   en.wikipedia.org/wiki/Life-cycle_greenhouse_gas...

   Some coal-fired power stations may operate for 50 years but others may be shut down after 20 years, [18] or less. [19] According to one 2019 study considering the time value of GHG emissions with techno-economic assessment considerably increases the life cycle emissions from carbon intensive fuels such as coal.

6. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   By comparison, most modern "warm air" furnaces typically use a fan to circulate air to the rooms of house and pull cooler air back to the furnace for reheating; this is called forced-air heat. Because the fan easily overcomes the resistance of the ductwork, the arrangement of ducts can be far more flexible than the octopus of old.

7. Pulverized coal-fired boiler - Wikipedia

   en.wikipedia.org/wiki/Pulverized_coal-fired_boiler

   Pieces of coal are crushed between balls or cylindrical rollers that move between two tracks or "races." The raw coal is then fed into the pulverizer along with air heated to about 650 °F (340 °C) from the boiler. As the coal gets crushed by the rolling action, the hot air dries it and blows out the usable fine coal powder to be used as fuel.