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Understanding the divergence in EROI for solar PV

Some analyses calculate an EROI for solar PV of 60:1 or higher, while some calculate a much lower EROI, in one recent case, less than 1:1. The casual observer could be forgiven for wondering what’s going on. Since there is such a wide divergence, the default...

Renewables and reactive power

A transition to higher penetration renewables is going to require much more attention to electricity networks. Most of the generator ancillary services have been essentially built into systems by virtue of using large synchronous generators. An earlier post explored...

The EROI of global food production

Glaub and Hall have an interesting analysis of the EROI of hunter-gatherers. Despite humans being generally smaller, slower, and weaker than most large mammals, humans were successful hunters long before the invention of sophisticated weaponry. This was achieved by...

Electricity generation will be modular

The delivery of Elon Musk’s battery is a triumph of modularity. Musk promised the South Australian Government that he would deliver the battery in 100 days and completed ahead of the deadline. Furthermore, wind and solar projects are regularly being delivered in 2...

Storage, markets and blockchain

I recently attended a presentation of the proposed Cultana Pumped Hydro Project in the Spencer Gulf South Australia, using sea water. Specifications are 225 MW power, 1,770 MWh storage capacity. It is conceptually similar to the Japanese Okinawa project. The...

The future of mobility

Last year, I posted on the penetration of electric vehicles in Australia. After reading Benedict Evans excellent piece on Cars and Second Order Consequences, I thought an update was timely. Benedict explores the higher order consequences of a shift to EV’s and full...

Pathways to the Post-Carbon Economy

In June 2017, Nafeez Ahmed published an article 3 ways Clean Energy will make Big Oil extinct in 12 to 32 Years — without subsidies  which illicited debate in the sustainability community. In response, Nafeez suggested a symposium titled Pathways to the Post-Carbon...