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Renewable energy: bug takes stock in burkardroth

renewable energy: bug takes stock in burkardroth

Exactly 20 years ago, the renewable energy law came into force as the successor to the electricity feed-in law, thus ushering in the "solar age" from. From this point on, the energy mix of electricity and heat in one's own home should be worthwhile. Waldemar bug, who had already installed the solar thermal system in 1996, also invested in the PV system in 2001. Today, the former mayor of burkardroth compares revenues and expenditures and remains satisfied because these investments have long since paid for themselves.

Seventies – the oil crisis. The middle east stopped the oil supply. On several sundays, cars were banned from the roads and alternative energy sources were sought. Waldemar bug from burkardroth, who studied mechanical engineering, wanted to meet the challenge of planning his house without fossil fuels as far as possible. But without fanaticism. Rather on the safe side. A practical, economically viable solution was needed, as the quality of life for all the residents of the house was at stake.

At a time when everyone in the bavarian rhon prepared their own wood, those with an eye on the dwindling global supply of energy sources had to look for alternative solutions on their own initiative. It was new territory for everyone. Consultants did not exist at that time and information was only found in technical literature and publications.

Waldemar bug built his prefabricated house in 1986 from a regional supplier as a model property. The customers of the manufacturing company were able to see the wooden house in burkardroth. Through the house inspections, a lot was also learned about the electricity and heat supply, or rather. The alternative possibilities spoken.

In 1992, the united nations issued the declaration on environment and sustainability, known as the rio declaration, and kicked off the wave of agenda processes. In burkardroth, where waldemar bug was first elected to the town council in 1996, two working groups were founded a few years later in which he was very active. They shared ideas around sustainability and provided information to residents.

Not everyone was convinced of this path. The politicians considered the use of solar energy as a "hobby" in the beginning, you couldn't imagine an industrialized country without fossil and nuclear energy use. However, the federal government enacted the renewable energy act of 2000. It regulated the rates of remuneration for the electricity from renewable sources and brought clarity to the market: so the rate for the "solar electricity" was, for plants in operation up to and including 2001, about 99 pfennigs per kwh, from 2002 this decreased to 48.1 C/kwh and thereafter depending on the construction of the plants further. Thus, the photovoltaic was always profitable and very long economical.

The photovoltaic also partially solved the problem of coal and nuclear power plants. As base-load power plants, they are difficult to regulate. With the nighttime electricity surplus, water was pumped into the higher lake in pumped storage power plants. During the day, these power plants were available to meet the midday peak demand. The cost of operating them was about twice as much as the feed-in tariff of the first PV systems. Fortunately, this is exactly the time when PV plants deliver their high output.

Alternative energy means not only new technology, but above all a new way of handling and distributing the available energy. In the bug family's house, electrical energy is needed for the normal household, the operation of a tailor's shop, the heating in the attic and cellar rooms, and an electric vehicle (smart for two, built in 2014). It goes without saying that the electric car will not be charged at night, when no solar energy is produced, but as much as possible during the day. The same is true for the household: the washing machine and the spooling machine run during the day and especially when the sun is shining. The daily routine is adapted accordingly as far as possible. The changeover requires some time and patience, but is very important in order to be able to benefit from it in the long term.

On average, the family needs about 8 kwh of electricity for the household, for the tailor's shop and for charging the electric car.600 kilowatt hours per year. 12,000 kilowatt hours of sustainable electricity are generated annually by the two new systems. It results in a surplus of about 3.400 kilowatt hours. Cost-effectiveness and the highest possible level of self-sufficiency were important criteria for the owner of the house. The storage costs, which were still high three years ago, led to a contradiction: a high level of self-sufficiency can only be achieved with an electricity storage system. However, this extends the amortization period from 10 to 14 years. Nevertheless, the choice fell on a system with storage and an investment of about 30.000 euro. Finally, there is still an interest rate of about two percent.

The old systems from 1996 and 2001 have long since paid for themselves. Apart from the replacement of the inverter for the PV system, no repairs have been necessary so far. The maintenance work is limited to checking whether everything is still working or not. For the monthly statistics.

"Real energy transition means, above all, putting one's own wishes into perspective" – according to waldemar bug. In a conversation with waldemar bug, it becomes clear that planning with only one's own interests in mind is no longer sufficient when it comes to securing the future. It is easy to come to the conclusion that the disproportionate consumption of resources is everyone's responsibility. Bug wish for the near future that the families learn to be self-sufficient and not completely dependent on the supermarket or fossil energy. He explains the question of how this can be achieved, for example, with the decision between new construction or renovation, and gives his personal tips for planning.

Energy tips for house planning

Saving building materials and protecting the village center: bug sees the advantages of free development in new planning, also from an energy point of view. He points out, however, that renovation saves an enormous amount of waste disposal and energy production costs for a large part of the building material. In addition, there is the fact that the demographic development will bring fewer and fewer inhabitants. The village core is still worthy of protection and attention according to bug. Vacancies should be kept within limits. In these cases it is necessary to decide between renovation or demolition with new construction.

Type of construction/embankment: when deciding to build a new building, the type of construction should not be neglected from an energy point of view. The surface area of the house should be as small as possible in relation to the living space. This is best achieved by the cube design, possibly combined with a monopitch roof instead of a flat roof to use solar energy. The next step is the damming of the walls and glass surfaces. Good insulation reduces heating costs in winter and keeps the interior cool in summer.

Heating/hot water preparation: you can't get by in our latitudes without (supplementary) heating. Today, the use of geothermal energy is suitable for this purpose. With the help of a modern heat pump, ideally powered by one's own solar energy, flat heating systems (floor, wall) can be ideally operated. Heating and hot water preparation with pellets or wood chips are also alternatives. The acquisition costs are higher than for gas, but in the long term, these systems are attractive due to the expected development of gas prices.

Terrace roofing: with a view to the new technology opens up opportunities to find an intelligent solution for the gross energy guzzlers in the house. This was the case, for example, with the dream of a winter garden, which, when heated, requires a lot of energy. The couple bug found a compromise here: instead of the winter garden, the terrace was roofed over – with pv glass modules that also provide sun protection in summer.

Specialist literature/advice: on the subject of solar energy waldemar bug gets his information from the forderverein solarenergie, the bund der energieverbraucher, he is a member of both organizations and subscribes to the magazine "photon". He is also a member of the german wind energy association. With today's rough offer at experts and specialists one must make sure that the consultation is neutral, thus not bound to a concrete product. In addition, the portals for private consumers, such as those of the bund fur energieverbraucher e.V. Inform yourself or take advantage of an initial consultation at the consumer advice center in bavaria near your place of residence. The federation for nature conservation also currently offers independent advice on the subject of photovoltaics.


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