Final answer:
The second largest share of Ontario's electricity is likely to be hydroelectric power, based on historical data and global energy trends. Nuclear typically holds the largest share in Ontario. However, energy mixes can evolve, so current data from official sources should be consulted for the most accurate information.
Step-by-step explanation:
In addressing the question about the second largest share of Ontario electricity, we must consider the different sources of electricity production in the region. Ontario generates electricity from various sources, including nuclear, hydroelectric, natural gas, wind, solar, and coal. While the information provided does not specify the exact ranking for Ontario, an understanding of global energy trends can guide us. Typically, non-renewable sources like coal and natural gas have been prominent; however, there is a significant contribution from renewable sources such as hydroelectric power, which is often the second-largest after nuclear in regions like Ontario.
For instance, hydroelectric power is a substantial electricity source in various parts of the world, as noted from the data suggesting that the top ten hydroelectric producers account for two-thirds of global hydroelectricity production. Moreover, Ontario has historically relied on hydroelectric power as a primary renewable source. Given this and the absence of specific data for Ontario in the question, it is likely that the second largest share of Ontario's electricity production would come from hydroelectric power, assuming that nuclear holds the largest share, which is typical for Ontario.
However, it should be noted that energy mixes can change over time due to various factors, including policy decisions, market changes, and technological advancements affecting the growth of renewable energy sources like wind and solar. Therefore, for the most accurate and current information on Ontario's energy mix, official and updated sources like government reports or power authorities should be consulted.