Krems an der Donau in the context of "Wachau"

The Rugii, Rogi or Rugians (Ancient Greek: Ρογοί, romanized: Rogoi), were one of the smaller Germanic peoples of Late Antiquity who are best known for their short-lived 5th-century kingdom upon the Roman frontier, near present-day Krems an der Donau in Austria. This kingdom, like those of the neighbouring Heruli and Sciri, first appears in records after the death of Attila in 453. The Rugii, Heruli, Sciri and others are believed to have moved into this region from distant homelands, and become part of Attila's Hunnic empire which also moved and came to be based in this region. The Rugii were subsequently part of the alliance which defeated Attila's sons and the Ostrogoths at the Battle of Nedao in 454, giving their kingdom independence. In 469 they were part of a similar alliance who lost to the Ostrogoths at the Battle of Bolia, weakening their kingdom significantly.

Many Rugii, once again along with Sciri, Heruli and other Danubians, joined Odoacer in Italy and became part of his kingdom there. Fearing new plots against him, he nevertheless invaded the Rugian kingdom in 487, and the Rugian lands were then settled by the Lombards from the north. Most Rugii still in the Danubian region eventually joined the Ostrogoth Theoderic the Great who killed Odoacer and replaced him with a Gothic-led regime in Italy. The Rugii were based in Pavia and played an important role in the Italian kingdom until it was destroyed by Justinian. The third last king was the Rugian Eraric who died in 541. After him these Rugii disappear from history.

Lower Austria (German: Niederösterreich pronounced [ˈniːdɐˌ(ʔ)øːstɐraɪç] , Bavarian: Niedaöstareich; Czech: Dolní Rakousy; Slovak: Dolné Rakúsko) is one of the nine states of Austria, located in the northeastern corner of the country. Major cities are Amstetten, Krems an der Donau, Wiener Neustadt and Sankt Pölten, which has been the capital of Lower Austria since 1986, replacing Vienna, which became a separate state in 1921. With a land area of 19,186 km (7,408 sq mi) and a population of 1.7 million people, Lower Austria is the largest and second-most-populous state in Austria (after Vienna).

Thermal energy storage (TES) is the storage of thermal energy for later reuse. Employing widely different technologies, it allows thermal energy to be stored for hours, days, or months. Scale both of storage and use vary from small to large – from individual processes to district, town, or region. Usage examples are the balancing of energy demand between daytime and nighttime, storing summer heat for winter heating, or winter cold for summer cooling (Seasonal thermal energy storage). Storage media include water or ice-slush tanks, masses of native earth or bedrock accessed with heat exchangers by means of boreholes, deep aquifers contained between impermeable strata; shallow, lined pits filled with gravel and water and insulated at the top, as well as eutectic solutions and phase-change materials.

Other sources of thermal energy for storage include heat or cold produced with heat pumps from off-peak, lower cost electric power, a practice called peak shaving; heat from combined heat and power (CHP) power plants; heat produced by renewable electrical energy that exceeds grid demand and waste heat from industrial processes. Heat storage, both seasonal and short term, is considered an important means for cheaply balancing high shares of variable renewable electricity production and integration of electricity and heating sectors in energy systems almost or completely fed by renewable energy.

Bezirk Krems is a district of the state of Lower Austria in Austria. It comprises the areas to the south, west and north of the city of Krems an der Donau, which itself is a statutory city.

Wachau is one of Austria's most established and notable wine regions, specializing in dry wines made from Riesling and Grüner Veltliner. Located in Lower Austria along the Danube, west of Vienna and Krems an der Donau, it is one of the westernmost wine producing regions in Austria with only a few scattered plantings in Tyrol being further west. While most of Austria follows a wine classification systems based on ripeness and harvest must weight that parallels the German wine classification system, Wachau wines have a unique classification system. The three classification levels for Wachau wine include Steinfeder for wines up to 11.5% alcohol level, Federspiel for wines between 11.5–12.5% and Smaragd that must have a minimum of 12.5% alcohol level. Despite its renown, the Wachau is a small wine region that usually accounts for only around 3% of Austria's wine production.