Contest #871 – Furnas Ibiúna substation, Ibiúna, Brazil

The third largest hydroelectric dam in the world is Itiapu on the border of Paraguay and Brazil. Each country gets half of the power, but since Paraguay uses a fraction of the power that Brazil does, they sell a big chunk of their share back to Brazil, but there’s a complication. Paraguay’s electric system runs on 50hz and the half of the generators at the dam that belong to Paraguay generate at that frequency. Brazil runs on 60hz and their generators generate at that frequency. So how do you get the part that Paraguay generates at 50hz to Brazil in a usable way.

That’s where Furnas Ibiúna substation comes in. At the dam, the part going to Brazil is converted to DC and sent down a couple of 800KM transmission lines which brings the power to this location. Once there, the power is converted back to AC, but at the 60hz frequency necessary for Brazilian use, and provided to the country’s grid.

You’ll note that this is a rare reveal without a picture. There wasn’t any that were particularly interesting or revealing.

Those who located this site before the hint:

  • Martin de Bock
  • Eloy Cano
  • Garfield
  • Phil Ower
  • Paul Voestermans
  • Angie CF
  • hhgygy
  • Lighthouse

and after the hint:

  • Graham Hedley
  • Bas van Limpt

Contest #870 – Østerild Wind Turbine Test Field, Thisted, Denmark

Wind turbines at Østerild Test Centre.jpg
By TGCPOwn work, CC BY-SA 4.0, Link

This facility serves as a test bed, calibration, and benchmarking site for new technology in offshore wind turbines. There are 9 slots for testing, usually 4-5 in use at a time. At any given time, the largest available wind turbine is being tested here, most recently a 222m rotor diameter monster producing 14MW.

Those who spun around this place before the hint were:

  • Glenmorren
  • Martin de Bock
  • Paul Voestermans
  • hhgygy
  • Garfield
  • Phil Ower
  • Eloy Cano
  • bernd
  • Lighthouse
  • Graham Hedley

    and after the hint:

    • Bas van Limpt
    • Angie CF
    • Jazzy_baby84
    • BX29
    • Gillian B

    The series completes with Garfield leading with 19 points.

Contest #869: the 2015 Tree of the Year on the football field in Orissaare, Estonia

While most of the football world has been watching either the UEFA or COPA tournaments, the football players in the town of Orissaare, Estonia had probably have their eyes open for the 2015 Tree of the Year. It’s in the middle of one of the football pitches in the town. The tree was there long before the football pitch was set up around it!

Found before the hint:

  • Glenmorren
  • Paul Voestermans
  • Lighthouse
  • Robin
  • hhgygy
  • Eloy Cano
  • Bas van Limpt
  • Felix Bossert
  • Phil Ower
  • Garfield
  • Martin de Bock
  • Graham Hedley
  • donaaronio
  • Angie CF

After the hint:

  • Bernd
  • Gillian B.
  • BX29