Solar PV has most definitely not had its day. The lifetime projected output of a typical 3kW domestic system now works out less per kWh, if you treat it as a single bulk purchase of all the free electricity it's ever going to produce in one lump sum, than the price you pay through your meter. And the latter figure is only heading one way. There aren't fortunes to be made since the rebate was cut so drastically, but it did its job: Get lots of people buying it while it's new, so the manufacturers make more, improve their techniques and it becomes cheaper for the next round of purchasers.
Heat pumps have a trap for the unwary. If you skimp on the cost and buy one that is too small, it will be making up the shortfall using electricity, which costs more than the fuel your heat pump was replacing. Rule One of Heating, Ventilation and Air Conditioning: You could always use a few extra kilowatts.
Biomass will be a slow burner. Remember, though: one day, renewable energy will be all the energy there is.
As for me ..... I do things with computers, like building fancy telephony systems and selling leads to the Home Improvements and Domestic Renewable Energy industries.