What if someone told you that we have everything we need to decarbonize most of the economy?   We would just need to start electrifying every new car, furnace, water heater, drier, and cookstove, and industrial process starting right now. And yeah, and put solar on every roof that can handle it.  If we are on a wartime footing for decarbonizing the economy, our guest, Saul, could be considered a 5-star general of the “electrify everything” movement. He founded or co-founded around a dozen companies and organizations. And he has a PhD from MIT in materials science and information theory.  Saul is now trying to marshal the world around his “a defensible and believable” pathway for decarbonizing America with clean electricity. - Energy Gang

The world needs a “radical” shift towards renewables to reach net-zero emissions by 2050 and secure the 1.5C goal, says the International Energy Agency (IEA).  This would see renewable energy overtake coal by 2026, passing oil and gas before 2030. By 2050, it should go on to meet two-thirds of global energy supply and nearly 90% of electricity generation.  In a 227-page report, titled “Net-zero by 2050: A roadmap for the global energy sector,” the IEA calls for “a total transformation of the energy systems that underpin our economies”.  It says this is a “critical year at the start of a critical decade for these efforts”, which must start turning the world’s energy system from one dominated by fossil fuels into a future “powered predominantly by renewable energy like solar and wind”.  - Carbon Brief

Critics have long dismissed rooftop solar as a niche product for wealthy homeowners who want to feel good about going green or are looking for security against blackouts. And it is conventional wisdom among utilities and regulators that large solar farms have an inherent cost advantage over the rooftop alternative because they benefit from economies of scale.  Chris Clack sees things differently.  In a fascinating report released last month, Clack and his coauthors estimated that eliminating nearly all planet-warming pollution from electricity generation would be $473 billion cheaper with dramatic growth in rooftop solar and batteries.

That calculation is based on Clack’s exhaustively detailed model of the U.S. electric grid, which he says includes 10,000 times more data points than traditional models and allows for a better accounting of rooftop solar’s costs and benefits to the grid. The model is such a complex beast that Clack built his own computers to help run the simulations, which can take five days to complete.

Researchers...looked out to 2050 and projected how electricity costs would change under a national policy requiring emissions to fall by 95%. When they mimicked traditional models that favor large solar and wind farms, they found that consumers would collectively pay $385 billion more for power over the next 30 years. Not an unreasonable price tag for taking a huge bite out of climate change, but still not the preferred direction if we can help it.

When they optimized for smaller-scale solutions...they found the cheapest way to reduce emissions actually involves building 247 gigawatts of rooftop and local solar power (equal to about one-fifth of the country’s entire generating capacity today). In this scenario, consumers would save $473 billion, relative to what electricity would otherwise cost.

The results come down to simple dollars and cents. - LA Times