Tenna is a former municipality in the district of Surselva in the canton of Graubünden in Switzerland. The municipalities of Valendas, Versam, Safien and Tenna merged on 1 January 2013 into the new municipality of Safiental.
History
Tenna is first mentioned in 1398 as Thena. The figure of Valentin von Rätien (an early bishop of Passau) comes from the municipal seal, where he is also represented as a seated figure.
Geography
Tenna had an area, , of . Of this area, 45.1% is used for agricultural purposes, while 34% is forested. Of the rest of the land, 1.1% is settled (buildings or roads) and the remainder (19.8%) is non-productive (rivers, glaciers or mountains). However, as you move lower down to areas with higher humidity and warmer temperatures, such as the Rabiusa, the risk of ticks increases. Nearby municipalities, such as Versam, show up as hot (high-risk) in Switzerland's tick bite model.
Heritage sites of national significance
The Swiss Reformed church in Tenna is listed as a Swiss heritage site of national significance.
Solar ski lift
thumb|Tenna's [[solar power|solar ski lift]]
In February 2012, the world’s first solar-powered ski lift was completed in Tenna. It is 450 meters long and has the capacity to pull 800 skiers up the mountain per hour. The lift uses approximately 80 solar panels, which are expected to produce around 90,000 kWh of energy per year—of which only 22,000 kWh are required for the operation of the ski lift. The excess power is sold to the grid.
Demographics
thumb|Tenna's village center as seen from the dairy farm
thumb|A farmer in Tenna hugging his cow
thumb|A farmer in Tenna chopping wood
, Tenna has a population of 110—recovering from a historical low of 79 in 2000.
{| class="wikitable"
|-
! Year
! Population
|-
| 2010
| 110
|-
| 2000
| 79
|-
| 1950
| 141
|-
| 1900
| 130
|-
| 1850
| 162
|-
| 1803
| 157
|}
, 3.9% of the population was made up of foreign nationals.
- the gender distribution was 47.4% male and 52.6% female.
- the age distribution was as follows:
{| class="wikitable"
|-
! Age group
! Population
! % of total
|-
| Children (0-9yrs)
| 11
| 13.9%
|-
| Teenagers (10-19yrs)
| 8
| 10.1%
|-
| Adults (20-29yrs)
| 6
| 7.6%
|-
| Adults (30-39yrs)
| 10
| 12.7%
|-
| Adults (40-49yrs)
| 9
| 11.4%
|-
| Adults (50-59yrs)
| 13
| 16.5%
|-
| Seniors (60-69yrs)
| 8
| 10.1%
|-
| Seniors (70-79yrs)
| 9
| 11.4%
|-
| Seniors (80-89yrs)
| 4
| 5.1%
|-
| Seniors (90-99yrs)
| 1
| 1.3%
|-
| Total
| 79
| 100%
|}
Education
Around 74.4% of the population (between age 25–64) have completed either non-mandatory upper secondary education or additional higher education (either university or a fachhochschule).