How many homes can the world’s largest offshore wind farm power in an hour?

Factful math: Grade 4th-6th

Math skills: Multiplication

Related Environmental issues: renewable energy

The world’s largest offshore wind farm Hornsea 2 in the UK has 165 wind turbines.

A single rotation of a wind turbine takes 6 seconds and generates energy to power a home for a day. How many homes can the Hornsea 2 wind farm power in an hour of operation? 

  1. 1,650 homes
  2. 9,900 homes
  3. 99,000 homes

ANSWER  3

1 hours = 3600 seconds

A wind turbine rotates [3600/6=600] times in an hour.

A wind turbine generates energy to power 600 homes in an hour.

There are 165 wind turbines in the Hornsea 2 wind farm, so the wind farm can generate energy to power [600 x 165 =  99,000] homes in an hour.

Source: BBC. Hornsea 2: North Sea wind farm claims title of world’s largest [https://www.bbc.com/news/science-environment-62731923].

 

What percent of vehicles sold in California were ZEV (Zero-emission vehicles) in 2021?

Factful math: Grade 4th-6th

Math skills: Percent

Related Environmental issues: Air / Climate change / Electric vehicles

California plans to stop selling gasoline-powered vehicles and sell only ZEVs (Zero-emission vehicles) by 2035.

About 2 million vehicles were sold in California in 2021. Among those vehicles, 250 thousand vehicles were ZEVs.  About what percent of vehicles sold in California were ZEVs in 2021?


ANSWER  about 13%

250 / 2000 x 100 = 12.5 = about 13%

Source: California Energy Commission, New ZEV Sales in California

Note: ZEV here includes BEV, PHEV, and FCEV.