The document discusses energy generation and renewable energy capacity in the United States. It states that total annual energy generation in the US is 78 quadrillion BTU. While solar PV generation is expected to increase more than 20 times by 2040, it will still only account for about 2% of global electricity supply. The document also notes that California led the US in wind installations in 2011 with 921 megawatts of new wind capacity added that year.