How do you forecast demand for residential solar in emerging markets?

For Southeast Asia I'd start with three signals: grid reliability data (outage frequency/duration by province), diesel fuel prices where off-grid is common, and household income brackets crossing the ~$5-8k/year threshold where solar becomes aspirational. IRENA and World Bank Open Data are solid free starting points, and Wood Mackenzie has paid reports specifically on APAC solar if your budget allows. Layering in Google Trends for terms like 'solar panel harga' (price in Bahasa) can also give you a surprisingly useful demand pulse at low cost.