Both calculations also show a rapid decline in wholesale electricity prices as a function of the increasing share of low marginal cost renewables. Electricity systems with very high renewable shares will have electricity prices equal to or below zero during a high number of hours of a year. This remains a major challenge for dispatchable technologies which, unlike renewables, do not receive any subsidies. Currently, dispatchable producers ensuring the public good of security of electricity supply are exposed to increasing commercial pressures due to the lower wholesale electricity prices and reduced load factors resulting from the influx of large amounts of electricity from subsidised renewables. Electricity price is assumed to be the cost of the marginal technology plus a mark-up of USD 10 per MWh.