power generation

Marcellus shale gas-drilling site in Pennsylvania.
Photo: Nicholas A. Tonelli.



















“Prediction is very difficult, especially if it is about the future.” Niels Bohr, the Nobel laurate in Physics, is credited with this line. It is always possible to develop a model that fits the past, but much more difficult to have the same model to correctly forecast the future.

Recent analysis by EIA (Energy Information Agency) and Lazard find that the lowest cost power generation is natural gas, wind and solar. It looks clear, going forward, what to invest in, but before doing so, there may be some lessons to be learnt from the past about making predictions.


In 2017 natural gas fired power plants generated 32 % of the electricity in the United States. Coal fired power plants delivered about 30 % of all power, while nuclear delivered about 20 %. Nearly 20 % came from renewable energy sources, out of which 47 % came from hydro power plants and about 37 % came from wind turbines.

Eight years earlier, 2009, when the shale-gas revolution had started to take off, coal was the number one source, 44 % of all electric generation. Natural gas represented 23 % of the generation and nuclear was at 20 %. Renewable generation, basically hydro and wind, produced 10.5 % of the electric power. (EIA data).

Natural gas has replaced coal as the primary source of power generation. Nuclear is basically unchanged at 20 %, while renewables with the growth of wind and solar generation, has doubled and represents about the same proportion of the power generation as nuclear.

In an industry that traditionally changes slow it is a big shift that has happened fast.