Consumers who want to sign a new fixed-rate gas supply contract now face the highest rate in three years. Fixed-rate electricity contracts have also risen, according to a new report from the Netherlands Authority for Consumers and Markets (ACM).Household rates track wholesale gas and electricity prices, which have risen sharply. As a result, prices for fixed gas contracts increased by about 4 percent over the past months. Electricity prices move the price of natural gas, and rates for fixed electricity contracts rose by about 1.5 percent from August.