As a rough guide, a standard electric storage system in Darwin may cost about $1,200–$2,500 installed, while heat-pump systems can be around $2,500–$5,500 and solar hot-water systems may cost more. The final price depends on system size, brand, electrical work, roof access, pipework and whether an old unit needs removing. Darwin’s climate can suit heat-pump and solar options, but a licensed plumber should recommend a system based on your household and site. Check current rebates with the NT Government or energy.gov.au, as eligibility and amounts can change.