The race is well and truly on for scale adoption of long term energy storage and this week two separate approaches each received significant funding rounds – Switzerland’s Energy Vault with another $100 million and Malta the Massachusetts-based thermal heat storage firm closed a $60 million round. This is the second slice of $100 million class funding, with Softbank leading a 2019 $110 million round that rocketed Energy Vault into the spotlight. Energy Vault has since built a full scale version of its product and “productized” its approach considerably – it relies on using cranes to build skyscraper-high piles of 35 ton weights, where the crane either uses energy to take the blocks upwards, or gives off electrical energy by…