ANDERSON — Environmental advocates have for decades touted solar power not only as beneficial, but necessary to wean U.S. consumers from what they say is a harmful dependence on fossil fuels. That message has made slow headway, however.According to the U.S. Energy Information Administration, the share of American energy consumption from fossil fuels has fallen from a peak of 94% in 1966 to 80% in 2019, the last year for which data is available. Solar energy currently makes up only 2.3% of the country’s total energy consumption.Ventures like the Mammoth Solar project in northwest Indiana — for which 13,000 acres have been leased from nearly 60 landowners — are aiming to accelerate the process, but the issue has been a political hot potato in other…