Australia's wind and solar boom looks set to power through 2019 following a record year, despite grid constraints and extra scrutiny from network operators to make sure new projects don't spark blackouts like ones that hit two years ago.

Abundant wind and sun, falling turbine and panel costs, and corporate demand for contracts to hedge against rising power tariffs have attracted dozens of international developers looking to build wind and solar farms Down Under.

Even though the developers have met with flip-flops on energy policy, a strained grid that has trouble integrating intermittent renewable power, and unexpected hook-up costs, they still see Australia as a growth market.